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Search for "properties" in Full Text gives 2245 result(s) in Beilstein Journal of Organic Chemistry. Showing first 200.

Unraveling aromaticity: the dual worlds of pyrazole, pyrazoline, and 3D carborane

  • Zahra Noori,
  • Miquel Solà,
  • Clara Viñas,
  • Francesc Teixidor and
  • Jordi Poater

Beilstein J. Org. Chem. 2025, 21, 412–420, doi:10.3762/bjoc.21.29

Graphical Abstract
  • photoinduced electron transfer [8][9]. Thanks to their notable photophysical properties, pyrazoles are applied in OLED technology [10]. Noticeably, in its ground state, pyrazole (C3H4N2) is an aromatic molecule that follows Hückel's rule, with two formal double bonds and a lone pair on one nitrogen generating
  • therefore non-aromatic. Even when fused with benzene via a C–C bond, pyrazoline remains non-aromatic, which is the case of indazoline. Icosahedral carboranes are globular molecular clusters made of carbon and boron, displaying 3D aromaticity [12][13][14][15]. Their unique properties – such as aromaticity
  • ], offering enhanced properties and efficacy [28][30][33][34][35]. Therefore, the advancement of simple, efficient methodologies for synthesizing o-carborane-fused heterocycles is critically needed. However, the limited number of synthetic strategies for carborane functionalization [36] continues to constrain
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Published 21 Feb 2025

The effect of neighbouring group participation and possible long range remote group participation in O-glycosylation

  • Rituparna Das and
  • Balaram Mukhopadhyay

Beilstein J. Org. Chem. 2025, 21, 369–406, doi:10.3762/bjoc.21.27

Graphical Abstract
  • the neighbouring C-2 position have been devised, formulated and standardised providing the neighbouring group assistance to form 1,2-trans glycosides [77][78]. However, acyl groups with electron-withdrawing properties in the neighbouring position have been observed to be disarming in nature in most of
  • protection: The pivaloyl (OPiv) ester is another such participating ester protection with decreased migratory properties. Moreover, the intrinsic neopentyl property of the ester significantly reduces the probability of nucleophilic attack at the oxocarbenium centre instead of the anomeric carbon, thereby
  • in machine-assisted oligosaccharide synthesis. 4-Acetoxy-2,2-dimethylbutanoyl (ADMB) esters were reported by Ensley and co-workers [108] having similar properties with the pivalate group. The facile removal of the C-2-ADMB group with a catalytic quantity of diazabicycloundecane (DBU) in methanol at
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Published 17 Feb 2025

Synthesis, structure, ionochromic and cytotoxic properties of new 2-(indolin-2-yl)-1,3-tropolones

  • Yurii A. Sayapin,
  • Eugeny A. Gusakov,
  • Inna O. Tupaeva,
  • Alexander D. Dubonosov,
  • Igor V. Dorogan,
  • Valery V. Tkachev,
  • Anna S. Goncharova,
  • Gennady V. Shilov,
  • Natalia S. Kuznetsova,
  • Svetlana Y. Filippova,
  • Tatyana A. Krasnikova,
  • Yanis A. Boumber,
  • Alexey Y. Maksimov,
  • Sergey M. Aldoshin and
  • Vladimir I. Minkin

Beilstein J. Org. Chem. 2025, 21, 358–368, doi:10.3762/bjoc.21.26

Graphical Abstract
  • properties towards CN− and Hg2+ ions and evaluation of in vitro cytotoxic activity against A431 skin cancer and H1299 lung cancer cell lines. Results and Discussion We found that boiling of equimolar amounts of benzannelated 2,3,3-trimethylindolenines 2a,b and o-chloranil (3) (method A) in dioxane leads to
  • represent molecular switches of optical and fluorescent properties under sequential addition of CN− and Hg2+ ions and the transformation cycle presented in Scheme 3 can be repeated at least 5–6 times. The resulting compounds 7b and 8a,b have extremely low water solubility, which makes it impossible to
  • properties under sequential addition of CN− and Hg2+ ions. 2-(1,1-Dimethyl-1H-benzo[e]indolin-2-yl)-5,6,7-trichloro-1,3-tropolone (7a) was found to exhibit high in vitro cytotoxic activity against A431 skin cancer and H1299 lung cancer cell lines. In addition, the IC50 values of compound 7a are significantly
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Published 17 Feb 2025

Synthesis of new condensed naphthoquinone, pyran and pyrimidine furancarboxylates

  • Kirill A. Gomonov,
  • Vasilii V. Pelipko,
  • Igor A. Litvinov,
  • Ilya A. Pilipenko,
  • Anna M. Stepanova,
  • Nikolai A. Lapatin,
  • Ruslan I. Baichurin and
  • Sergei V. Makarenko

Beilstein J. Org. Chem. 2025, 21, 340–347, doi:10.3762/bjoc.21.24

Graphical Abstract
  • heterocyclic structures leads to the production of new types of heterocyclic compounds with practical useful properties [1][2][3][4][5][6]. Representatives of the naphthofuran series exhibit anticancer [7] and antiinfectious activity [8]. Anticancer properties have also been found in representatives of the
  • ethyl esters 5b and 6b is −15.6(2) and −11.5(2)°, respectively, indicating that in the case of methyl esters, the alkoxycarbonyl fragment is less out of plane, causing a greater conjugation with the furan fragment. The possibility of exhibiting fluorescent properties was investigated for tetracyclic
  • , λMo Kα = 0.71073 Å, ω and φ scanning in 0.5° steps) at the distributed spectral-analytical center of shared facilities for study of structure, composition and properties of substances and materials of FRC Kazan scientific center of Russian academy of sciences. Crystals of compounds suitable for X-ray
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Published 12 Feb 2025

Antibiofilm and cytotoxic metabolites from the entomopathogenic fungus Samsoniella aurantia

  • Rita Toshe,
  • Syeda J. Khalid,
  • Blondelle Matio Kemkuignou,
  • Esteban Charria-Girón,
  • Paul Eckhardt,
  • Birthe Sandargo,
  • Kunlapat Nuchthien,
  • J. Jennifer Luangsa-ard,
  • Till Opatz,
  • Hedda Schrey,
  • Sherif S. Ebada and
  • Marc Stadler

Beilstein J. Org. Chem. 2025, 21, 327–339, doi:10.3762/bjoc.21.23

Graphical Abstract
  • anticancer properties [6]. With concerns about biofilm formation and resistance escalating in the medical field, entomopathogenic fungi have emerged as a promising source of novel bioactive compounds [5]. Our recent exploration of B. neobassiana highlighted this growing interest, affording one tetramic acid
  • screening assays were conducted to explore their antibiofilm properties. According to the crystal violet (CV) assay, both compounds exhibited significant activity in the S. aureus biofilm inhibition assay. Farinosone A (2) (Figure 5A) displayed activity at a concentration as low as 3.9 µg/mL, resulting in
  • activity trend, reflecting the results from CV biofilm inhibition assay, where compound 2 was found to be more effective than compound 1. The genetic and molecular basis of biofilm formation in staphylococci are complex. This process involves at least two key properties: planktonic cell adherence to
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Published 11 Feb 2025

Red light excitation: illuminating photocatalysis in a new spectrum

  • Lucas Fortier,
  • Corentin Lefebvre and
  • Norbert Hoffmann

Beilstein J. Org. Chem. 2025, 21, 296–326, doi:10.3762/bjoc.21.22

Graphical Abstract
  • advantageous for large-scale applications, offering enhanced safety and operational simplicity. Traditionally, research in this field has focused on metal-based photocatalysts, particularly those based on transition metals like ruthenium and osmium due to their intrinsic photophysical properties. However, with
  • , which exploits the properties of red-light excitation while addressing the energy constraints posed by low-energy photons. Whereas multiple works addressing the upconversion phenomenon involving heavy metals like palladium, platinum [23][24] or osmium [25], grafted ruthenium complexes over ytterbium and
  •  4d) [30]. In a continuation of this trend, a recent study by O. S. Wenger et al. further expands the frontiers of red-light photoredox catalysis with first-row transition metals by introducing Cr(0) luminophores that exhibit photophysical properties competitive with Ru(II) and Os(II) complexes [31
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Published 07 Feb 2025

Oxidation of [3]naphthylenes to cations and dications converts local paratropicity into global diatropicity

  • Abel Cárdenas,
  • Zexin Jin,
  • Yong Ni,
  • Jishan Wu,
  • Yan Xia,
  • Francisco Javier Ramírez and
  • Juan Casado

Beilstein J. Org. Chem. 2025, 21, 277–285, doi:10.3762/bjoc.21.20

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  • , National University of Singapore, 3 Science Drive 3, Singapore, Singapore 10.3762/bjoc.21.20 Abstract Oxidized states of polycyclic aromatic hydrocarbons are of importance as they represent charged conductive species in organic semiconductor substrates. In this work, we investigated the properties of
  • , all of which lead to conductive and photoactive species [9][12]. Given the inherent instability of neutral antiaromatic systems, including those systems containing fragments or moieties with local antiaromaticity, the detailed structural properties of the charged species formed from neutral
  • 1700 cm−1 Raman band) and in NAP for m-2 (marked by the triplet in the 1500–1600 cm−1 region). Nucleus-independent chemical shifts (NICS) Among the different criteria to evaluate aromaticity, magnetic properties are the most confident, as they are directly connected with the ring currents associated to
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Published 05 Feb 2025

Synthesis and characterizations of highly luminescent 5-isopropoxybenzo[rst]pentaphene

  • Islam S. Marae,
  • Jingyun Tan,
  • Rengo Yoshioka,
  • Zakaria Ziadi,
  • Eugene Khaskin,
  • Serhii Vasylevskyi,
  • Ryota Kabe,
  • Xiushang Xu and
  • Akimitsu Narita

Beilstein J. Org. Chem. 2025, 21, 270–276, doi:10.3762/bjoc.21.19

Graphical Abstract
  • properties were investigated by UV–vis absorption and fluorescence spectroscopy in compassion to pristine BPP and its oxidation product, benzo[rst]pentaphene-5,8-dione (BPP-dione). BPP-OiPr exhibited a significantly enhanced photoluminescence quantum yield (PLQY), reaching 73% in comparison to pristine BPP
  • by scanning electron microscopy. The intriguing optical properties of BPP and its derivatives may lead to their application as fluorophores. Keywords: benzo[rst]pentaphene; intramolecular charge transfer; nanocrystals; photoluminescence; polycyclic aromatic hydrocarbon; Introduction Polycyclic
  • aromatic hydrocarbons (PAHs) have attracted increasing attention in view of their fascinating optical and electronic properties, which strongly depend on their size, shape, and edge structures, e.g., armchair and zigzag [1][2][3][4][5][6]. Benzo[rst]pentaphene (BPP) is an intriguing PAH with a combination
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Published 04 Feb 2025

Effect of substitution position of aryl groups on the thermal back reactivity of aza-diarylethene photoswitches and prediction by density functional theory

  • Misato Suganuma,
  • Daichi Kitagawa,
  • Shota Hamatani and
  • Seiya Kobatake

Beilstein J. Org. Chem. 2025, 21, 242–252, doi:10.3762/bjoc.21.16

Graphical Abstract
  • family of photochromic compounds. This study explores the photochromic properties and thermal back reactivities of various aza-diarylethene regioisomers (N1–N4 and I1–I4) in n-hexane. These molecules exhibit fast thermally reversible photochromic reactions driven by 6π aza-electrocyclization. Kinetic
  • Molecular photoswitches have been studied for a long time because their physicochemical properties such as refractive index [1][2], dipole moment [3][4], conductivity [5][6], magnetism [7][8], and fluorescence [9][10][11] can be spatiotemporally modulated by light without physical contact. Therefore
  • ][26][27], photomechanical materials [28][29][30][31][32], and so on. As seen in these representative application examples, the thermal stability of the colorless and colored isomers is one of the essential properties of molecular photoswitches. For example, the photochemically reversible-type (P-type
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Published 31 Jan 2025

Visible-light-promoted radical cyclisation of unactivated alkenes in benzimidazoles: synthesis of difluoromethyl- and aryldifluoromethyl-substituted polycyclic imidazoles

  • Yujun Pang,
  • Jinglan Yan,
  • Nawaf Al-Maharik,
  • Qian Zhang,
  • Zeguo Fang and
  • Dong Li

Beilstein J. Org. Chem. 2025, 21, 234–241, doi:10.3762/bjoc.21.15

Graphical Abstract
  • pharmaceuticals and agrochemicals nowadays, largely due to the unique ability of fluorinated groups to influence the physicochemical and biochemical properties of molecules [1][2][3]. Among the various fluorinated functionalities, the difluoromethyl (CF2H) group and its aryl-substituted derivative, the benzylic
  • properties that can modify the activity and pharmacokinetic profiles of drugs [7]. Prominent examples include pantoprazole, a widely used proton-pump inhibitor (PPI) featuring a CF2H group; deracoxib, another drug that also incorporates a CF2H moiety in its structure; and a MET inhibitor specifically
  • designed with a PhCF2 group (Figure 1a) [8][9][10]. As a result, there is a pressing need for the development of efficient methods for incorporating both the CF2H and PhCF2 groups into diverse molecular frameworks, particularly those with bioactivity properties. The benzimidazole core is widely recognized
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Published 30 Jan 2025

Streamlined modular synthesis of saframycin substructure via copper-catalyzed three-component assembly and gold-promoted 6-endo cyclization

  • Asahi Kanno,
  • Ryo Tanifuji,
  • Satoshi Yoshida,
  • Sota Sato,
  • Saori Maki-Yonekura,
  • Kiyofumi Takaba,
  • Jungmin Kang,
  • Kensuke Tono,
  • Koji Yonekura and
  • Hiroki Oguri

Beilstein J. Org. Chem. 2025, 21, 226–233, doi:10.3762/bjoc.21.14

Graphical Abstract
  • the optical properties of 18 in CHCl3 (c = 100 μM) by measuring its UV–vis absorption spectrum as well as its excitation and emission spectra. The UV–vis spectrum of 18 showed two absorption peaks at 334 nm and around 375 nm (gray solid line). When excited at 375 nm, the emission spectra of 18
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Published 28 Jan 2025

Heteroannulations of cyanoacetamide-based MCR scaffolds utilizing formamide

  • Marios Zingiridis,
  • Danae Papachristodoulou,
  • Despoina Menegaki,
  • Konstantinos G. Froudas and
  • Constantinos G. Neochoritis

Beilstein J. Org. Chem. 2025, 21, 217–225, doi:10.3762/bjoc.21.13

Graphical Abstract
  • fashion, substituted indolopyrimidone derivatives 7a–e were obtained within 3 h in 31–90% total yield (2 steps) upon heating with formamide (Scheme 5). Next, we characterized certain physicochemical properties of the newly synthesized compounds. The absorbance and emission spectra of 5–7 were obtained
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Published 24 Jan 2025

Dioxazolones as electrophilic amide sources in copper-catalyzed and -mediated transformations

  • Seungmin Lee,
  • Minsuk Kim,
  • Hyewon Han and
  • Jongwoo Son

Beilstein J. Org. Chem. 2025, 21, 200–216, doi:10.3762/bjoc.21.12

Graphical Abstract
  • secondary amines via an N-acyl nitrene intermediate [77]. Amidines, found in biologically active compounds, have been widely investigated in medicinal chemistry due to their potent antiviral, antibacterial, anticancer, and other therapeutic properties [78][79][80][81]. As shown in Scheme 4, dioxazolones
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Published 22 Jan 2025

Hydrogen-bonded macrocycle-mediated dimerization for orthogonal supramolecular polymerization

  • Wentao Yu,
  • Zhiyao Yang,
  • Chengkan Yu,
  • Xiaowei Li and
  • Lihua Yuan

Beilstein J. Org. Chem. 2025, 21, 179–188, doi:10.3762/bjoc.21.10

Graphical Abstract
  • of noncovalent interactions that work independently from each other [5][6][7][8]. Generating such motifs with orthogonal propensity is appealing not only for the construction of supramolecular polymers with the ability to modulate their structure and properties in multiple ways through adjustment of
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Published 17 Jan 2025

Cu(OTf)2-catalyzed multicomponent reactions

  • Sara Colombo,
  • Camilla Loro,
  • Egle M. Beccalli,
  • Gianluigi Broggini and
  • Marta Papis

Beilstein J. Org. Chem. 2025, 21, 122–145, doi:10.3762/bjoc.21.7

Graphical Abstract
  • behavior or reactivity properties. The ambiguity related to the role of Cu(OTf)2 is particularly relevant for cycloaddition reactions, where it is even more difficult to justify the activation of the copper species as a Lewis acid or metal catalyst [12][13][14]. The reaction mechanism involved can be ionic
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Published 14 Jan 2025

Recent advances in organocatalytic atroposelective reactions

  • Henrich Szabados and
  • Radovan Šebesta

Beilstein J. Org. Chem. 2025, 21, 55–121, doi:10.3762/bjoc.21.6

Graphical Abstract
  • becoming increasingly relevant also in medicine. Many axially chiral compounds are important as catalysts in asymmetric catalysis or have chiroptical properties. This review overviews recent progress in the synthesis of axially chiral compounds via asymmetric organocatalysis. Atroposelective
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Published 09 Jan 2025

Hot shape transformation: the role of PSar dehydration in stomatocyte morphogenesis

  • Remi Peters,
  • Levy A. Charleston,
  • Karinan van Eck,
  • Teun van Berlo and
  • Daniela A. Wilson

Beilstein J. Org. Chem. 2025, 21, 47–54, doi:10.3762/bjoc.21.5

Graphical Abstract
  • broadening their potential applications in drug delivery and nanotechnology. Our findings shed light on the unique capabilities of polysarcosine-based polymers, paving the way for further exploration and harnessing of their distinctive properties in biomedical research. Keywords: biodegradable; poly(benzyl
  • properties. Moreover, these materials offer versatility in their synthesis, allowing for the incorporation of various building blocks to tailor the polymers to desired specifications. Additionally, they lend themselves well to the synthesis of block copolymers, further expanding their potential applications
  • properties are crucial, particularly its permeability. Excessive permeability allows water molecules – and potentially larger molecules – to traverse the membrane without exerting adequate force, undermining the transformation process [20][21]. Lastly, membrane stiffness plays a role; the stiffness of the
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Published 08 Jan 2025

Facile one-pot reduction of β-nitrostyrenes to phenethylamines using sodium borohydride and copper(II) chloride

  • Laura D’Andrea and
  • Simon Jademyr

Beilstein J. Org. Chem. 2025, 21, 39–46, doi:10.3762/bjoc.21.4

Graphical Abstract
  • ; phenethylamine; Introduction The phenethylamine scaffold represents a recurring motif among natural and synthetic drug molecules. The latter are mainly constituted by a varied class of substituted phenylethylamines exhibiting psychoactive properties, and typically employed for medical and recreational use [1][2
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Published 07 Jan 2025

Emerging trends in the optimization of organic synthesis through high-throughput tools and machine learning

  • Pablo Quijano Velasco,
  • Kedar Hippalgaonkar and
  • Balamurugan Ramalingam

Beilstein J. Org. Chem. 2025, 21, 10–38, doi:10.3762/bjoc.21.3

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Published 06 Jan 2025

Synthesis, structure and π-expansion of tris(4,5-dehydro-2,3:6,7-dibenzotropone)

  • Yongming Xiong,
  • Xue Lin Ma,
  • Shilong Su and
  • Qian Miao

Beilstein J. Org. Chem. 2025, 21, 1–7, doi:10.3762/bjoc.21.1

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  • the 1880s, Schwarz described triply periodic minimal surfaces, which serve as the topological foundation for what are now known as Mackay crystals. Despite predictions that carbon schwarzites would have intriguing properties for various potential applications [4][5], they have not yet been
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Published 02 Jan 2025

Synthesis, characterization, and photophysical properties of novel 9‑phenyl-9-phosphafluorene oxide derivatives

  • Shuxian Qiu,
  • Duan Dong,
  • Jiahui Li,
  • Huiting Wen,
  • Jinpeng Li,
  • Yu Yang,
  • Shengxian Zhai and
  • Xingyuan Gao

Beilstein J. Org. Chem. 2024, 20, 3299–3305, doi:10.3762/bjoc.20.274

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  • HRMS spectrometry were in full agreement with the expected structures, and single-crystal X-ray diffraction analysis was conducted to confirm the structure of compound 7-H. Moreover, the photophysical properties of these PhFlOP derivatives were determined by UV–vis absorption and photoluminescence
  • studies, revealing that their photophysical behavior can be affected by the different substituents in the donor carbazole group. Keywords: carbazole; D−A−D type; noble-metal-free system; 9‑phenyl-9-phosphafluorene oxide; photophysical properties; Introduction π-Conjugated molecular materials containing
  • ]. Compared to the traditional PO-containing moieties, PhFlOP possesses an enhanced rigid structure to reduce the possibility of nonradiative decay processes, which would improve optoelectronic properties [17][27]. Thermally activated delayed fluorescence (TADF) materials and devices have emerged rapidly in
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Published 30 Dec 2024

Synthesis of acenaphthylene-fused heteroarenes and polyoxygenated benzo[j]fluoranthenes via a Pd-catalyzed Suzuki–Miyaura/C–H arylation cascade

  • Merve Yence,
  • Dilgam Ahmadli,
  • Damla Surmeli,
  • Umut Mert Karacaoğlu,
  • Sujit Pal and
  • Yunus Emre Türkmen

Beilstein J. Org. Chem. 2024, 20, 3290–3298, doi:10.3762/bjoc.20.273

Graphical Abstract
  • focus of extensive research within the past two decades due to their interesting structural features, attractive photophysical properties, and diverse applications [2]. Indeed, fluoranthenes are particularly useful in supramolecular chemistry, organic electronics, and materials science [3] as
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Published 23 Dec 2024

Efficient synthesis of fluorinated triphenylenes with enhanced arene–perfluoroarene interactions in columnar mesophases

  • Yang Chen,
  • Jiao He,
  • Hang Lin,
  • Hai-Feng Wang,
  • Ping Hu,
  • Bi-Qin Wang,
  • Ke-Qing Zhao and
  • Bertrand Donnio

Beilstein J. Org. Chem. 2024, 20, 3263–3273, doi:10.3762/bjoc.20.270

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  • tuneability of the optical and electronic properties, which can potentially be exploited for advanced applications in display technologies, photonic devices, sensors, and organic electronics. We recently successfully reported the straightforward synthesis of several mesogens containing four lateral aliphatic
  • critical role in the engineering of functional and complex supramolecular assemblies [3][4][5][6][7][8][9][10][11], ranging from rigid crystalline architectures [3][4][5][6][7][8] to soft liquid crystalline materials [9][10][11]. Their unique properties originate from the high electronegativity of the
  • fluorine atoms, inserted in the aromatic rings, which considerably modifies the dipole moment of the corresponding fluorinated aromatic rings with respect to their hydrogenated homologs, thus influencing their behavior, binding affinities, and optoelectronic properties. These interactions already represent
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Published 16 Dec 2024

Non-covalent organocatalyzed enantioselective cyclization reactions of α,β-unsaturated imines

  • Sergio Torres-Oya and
  • Mercedes Zurro

Beilstein J. Org. Chem. 2024, 20, 3221–3255, doi:10.3762/bjoc.20.268

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  • moiety in up to 99% yields, up to 93% ee and >20:1 dr (Scheme 5) to be obtained. In general, the steric and electronic properties of the conjugated imines had a slight effect on the enantioselectivities of the reactions. However, the authors pointed out that the azlactones with different substituents at
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Published 10 Dec 2024

Synthesis of extended fluorinated tripeptides based on the tetrahydropyridazine scaffold

  • Thierry Milcent,
  • Pascal Retailleau,
  • Benoit Crousse and
  • Sandrine Ongeri

Beilstein J. Org. Chem. 2024, 20, 3174–3181, doi:10.3762/bjoc.20.262

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  • groups (CF3 or CF2H) in organic molecules can modulate their physicochemical (pKa, lipophilicity), structural (additional hydrophobic and hydrogen-bond interactions), and biological properties (metabolic stability, membrane permeability) [14][15]. Alongside the very well-known CF3 group, the CF2H group
  • electronic and structural properties of the fluorinated groups (CF3 or CF2H) and the geometric constraints due to its partially unsaturated cycle, which could help in the design of peptidomimetics. To our knowledge, only a few publications report the synthesis of tetrahydropyridazines with a carboxylic acid
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Published 04 Dec 2024
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