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Search for "characterization" in Full Text gives 1534 result(s) in Beilstein Journal of Organic Chemistry. Showing first 200.

Solvent-dependent chemoselective synthesis of different isoquinolinones mediated by the hypervalent iodine(III) reagent PISA

  • Ze-Nan Hu,
  • Yan-Hui Wang,
  • Jia-Bing Wu,
  • Ze Chen,
  • Dou Hong and
  • Chi Zhang

Beilstein J. Org. Chem. 2024, 20, 1914–1921, doi:10.3762/bjoc.20.167

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  • characterization data, and spectra. Funding This work was financially supported by the National Natural Science Foundation of China (numbers 22071116 and 21772096).
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Published 07 Aug 2024

Novel oxidative routes to N-arylpyridoindazolium salts

  • Oleg A. Levitskiy,
  • Yuri K. Grishin and
  • Tatiana V. Magdesieva

Beilstein J. Org. Chem. 2024, 20, 1906–1913, doi:10.3762/bjoc.20.166

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  • reported as substrates for nucleophilic substitutions using potassium fluoride [22]. The study is in progress now. Voltammetry characterization of the N-arylpyridoindazolium salts S1–S3 and their precursors, diarylamines A1–A3 The electrochemical investigation of the new salts was performed at a Pt
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Published 07 Aug 2024

Electrochemical radical cation aza-Wacker cyclizations

  • Sota Adachi and
  • Yohei Okada

Beilstein J. Org. Chem. 2024, 20, 1900–1905, doi:10.3762/bjoc.20.165

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  • cyclization.a Supporting Information Supporting Information File 6: General remarks and characterization data, including copies of 1H and 13C NMR spectra. Funding This work was supported in part by JSPS KAKENHI Grant No. 22K05450 (to Y. O.), and TEPCO Memorial Foundation (to Y. O.).
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Published 05 Aug 2024

Discovery of antimicrobial peptides clostrisin and cellulosin from Clostridium: insights into their structures, co-localized biosynthetic gene clusters, and antibiotic activity

  • Moisés Alejandro Alejo Hernandez,
  • Katia Pamela Villavicencio Sánchez,
  • Rosendo Sánchez Morales,
  • Karla Georgina Hernández-Magro Gil,
  • David Silverio Moreno-Gutiérrez,
  • Eddie Guillermo Sanchez-Rueda,
  • Yanet Teresa-Cruz,
  • Brian Choi,
  • Armando Hernández Garcia,
  • Alba Romero-Rodríguez,
  • Oscar Juárez,
  • Siseth Martínez-Caballero,
  • Mario Figueroa and
  • Corina-Diana Ceapă

Beilstein J. Org. Chem. 2024, 20, 1800–1816, doi:10.3762/bjoc.20.159

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  • antibiotics against drug-resistant pathogens. Although certain RiPPs with activity against Clostridia have been described [31], the characterization of complete gene clusters encoding for lantibiotics, using their native biosynthetic machinery and not that of nisin or of other non-native peptides, as well as
  • the chemical characterization of the NPs that are produced and the modifications they suffer, from a Clostridium genus, have yet to be accomplished. This is due to the difficulty in isolating and maintaining such strains in the laboratory and the limited availability of genome sequences compared to
  • chemical structures of these lantibiotics make them promising candidates for treating drug-resistant pathogens, and the characterization of these compounds from Clostridium provides an opportunity to develop new antibiotics. Results and Discussion Genome mining of LanM enzymes’ sequence diversity to
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Published 30 Jul 2024

Chiral bifunctional sulfide-catalyzed enantioselective bromolactonizations of α- and β-substituted 5-hexenoic acids

  • Sao Sumida,
  • Ken Okuno,
  • Taiki Mori,
  • Yasuaki Furuya and
  • Seiji Shirakawa

Beilstein J. Org. Chem. 2024, 20, 1794–1799, doi:10.3762/bjoc.20.158

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  • and solvents. Substrate scope. Larger-scale synthesis and transformations of bromolactonization product 3a. Supporting Information Supporting Information File 20: Experimental procedures, characterization data, copies of NMR spectra, and copies of HPLC charts. Funding K.O. thanks the JSPS for a
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Published 30 Jul 2024

Synthesis and characterization of 1,2,3,4-naphthalene and anthracene diimides

  • Adam D. Bass,
  • Daniela Castellanos,
  • Xavier A. Calicdan and
  • Dennis D. Cao

Beilstein J. Org. Chem. 2024, 20, 1767–1772, doi:10.3762/bjoc.20.155

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  • Adam D. Bass Daniela Castellanos Xavier A. Calicdan Dennis D. Cao Chemistry Department, Macalester College, 1600 Grand Avenue, Saint Paul, Minnesota 55105, United States 10.3762/bjoc.20.155 Abstract We report the synthesis and characterization of naphthalene and anthracene scaffolds end-capped by
  • organic thin-film transistors from heteroacenes. Inspired by these results, we sought to demonstrate the preparation of all-carbon scaffolds, i.e., acenes, that are cata-annulated with cyclic imides. Here, we communicate the successful synthesis of 1,2,3,4-NDIs and -ADIs and the characterization of their
  • the longer interaction distances and interceding incorporation of CH2Cl2 (Figure 2b). Furthermore, in 8-Ph the interstack C=O···H–C interaction is skewed such as to involve only one C=O, compared to the symmetric dual-contact that is seen for 7-Ph. Optical and electronic characterization The
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Published 25 Jul 2024

Synthesis of polycyclic aromatic quinones by continuous flow electrochemical oxidation: anodic methoxylation of polycyclic aromatic phenols (PAPs)

  • Hiwot M. Tiruye,
  • Solon Economopoulos and
  • Kåre B. Jørgensen

Beilstein J. Org. Chem. 2024, 20, 1746–1757, doi:10.3762/bjoc.20.153

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  • cell equipped with a platinum-coated cathode and a carbon-filled PPS (polyphenylene sulfide) micro-channel anode separated by a polyetheretherketone (PEEK) gasket [40]. Further experimental details and characterization of new compounds are given in Supporting Information File 1. General procedure A
  • : Detailed experimental procedures and characterization data of new molecules together with individual cyclic voltagrams with onset potentials.
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Published 24 Jul 2024

Ring opening of photogenerated azetidinols as a strategy for the synthesis of aminodioxolanes

  • Henning Maag,
  • Daniel J. Lemcke and
  • Johannes M. Wahl

Beilstein J. Org. Chem. 2024, 20, 1671–1676, doi:10.3762/bjoc.20.148

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  • acids. Comparison of the effect of structural variations on the photoreaction. Supporting Information Supporting Information File 2: Experimental procedures, characterization data and copies of NMR spectra. Acknowledgements Generous support from the Johannes Gutenberg-Universität Mainz is acknowledged
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Published 19 Jul 2024

Polymer degrading marine Microbulbifer bacteria: an un(der)utilized source of chemical and biocatalytic novelty

  • Weimao Zhong and
  • Vinayak Agarwal

Beilstein J. Org. Chem. 2024, 20, 1635–1651, doi:10.3762/bjoc.20.146

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  • Microbulbifer bacteria belong to β-agarases. GH-16 agarases: The first report for the characterization of an agarase from the Microbulbifer genus was from the strain Microbulbifer sp. JAMB-A7 isolated from deep-sea sediment [25] wherein the agarase encoding gene agaA7 was sequenced and cloned. The recombinant
  • agarases to be encoded which belonged to the GH-50 agarase family. The enzymes were named AgaA50, AgaB50, and AgaC50. Biochemical characterization of these three enzymes revealed that AgaA50 and AgaC50 generated neoagarobiose products implying cleavage within the agarose polymer (endolytic hydrolysis). The
  • the characterization of a purified agarase belonging to the family GH-86 from Microbulbifer bacteria. Alginate lyases The polysaccharide alginate is produced by various seaweeds and bacteria [44]. Two building blocks, β-ᴅ-mannuronic acid (M) and α-ʟ-guluronic acid (G), are used to assemble alginate in
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Published 17 Jul 2024

New triazinephosphonate dopants for Nafion proton exchange membranes (PEM)

  • Fátima C. Teixeira,
  • António P. S. Teixeira and
  • C. M. Rangel

Beilstein J. Org. Chem. 2024, 20, 1623–1634, doi:10.3762/bjoc.20.145

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  • membranes, new triazinephosphonate (TPs) derivatives were prepared to be applied as dopants through their incorporation into new doped membranes. To this purpose, the present work reports on the synthesis and characterization of a new series of 1,3,5-triazinephosphonate (TPs) derivatives in the anticipation
  • (34%) of Nafion perfluorinated resin solution was purchased from Sigma-Aldrich. Purification of reaction products was done by column chromatography on silica gel (230–400 mesh) with the appropriate eluent mixture and using a positive pressure of nitrogen. Spectroscopic characterization The
  • characterization of the dopants was carried out by Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry (MS). 1H, 13C and 31P NMR characterization was done using different one- and two-dimensional techniques, and were obtained on a Bruker Avance III HD
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Published 17 Jul 2024

Generation of multimillion chemical space based on the parallel Groebke–Blackburn–Bienaymé reaction

  • Evgen V. Govor,
  • Vasyl Naumchyk,
  • Ihor Nestorak,
  • Dmytro S. Radchenko,
  • Dmytro Dudenko,
  • Yurii S. Moroz,
  • Olexiy D. Kachkovsky and
  • Oleksandr O. Grygorenko

Beilstein J. Org. Chem. 2024, 20, 1604–1613, doi:10.3762/bjoc.20.143

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  • synthesis of compound library 4, experimental section including compound characterization data, and copies of NMR spectra. Supporting Information File 13: Structures of reactants 1, 2, and 3. Supporting Information File 14: Parallel synthesis of compound library 4. Supporting Information File 15
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Published 16 Jul 2024

Supramolecular assemblies of amphiphilic donor–acceptor Stenhouse adducts as macroscopic soft scaffolds

  • Ka-Lung Hung,
  • Leong-Hung Cheung,
  • Yikun Ren,
  • Ming-Hin Chau,
  • Yan-Yi Lam,
  • Takashi Kajitani and
  • Franco King-Chi Leung

Beilstein J. Org. Chem. 2024, 20, 1590–1603, doi:10.3762/bjoc.20.142

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  • rearrangement between a barbiturate–furan adduct 4 and compound 3n under ambient conditions in dichloromethane and hexafluoro-2-propanol (HFIP). The synthetic procedures and characterization of all newly synthesized compounds, including DA11, DA7, and DA6, are summarized in Supporting Information File 1
  • used for the fabrication of macroscopic soft scaffolds after charge screening with complementary ions. Fabrication and characterization of macroscopic soft scaffolds of DAn in aqueous medium A freshly prepared aqueous solution of DA11 (5.0 wt %, 82 mM) was deep blue and remained stable for months. By
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Published 15 Jul 2024

Mining raw plant transcriptomic data for new cyclopeptide alkaloids

  • Draco Kriger,
  • Michael A. Pasquale,
  • Brigitte G. Ampolini and
  • Jonathan R. Chekan

Beilstein J. Org. Chem. 2024, 20, 1548–1559, doi:10.3762/bjoc.20.138

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  • ], the majority of the proposed structures for these known cyclopeptide alkaloids are simply predicted by MS/MS fragmentation. Therefore, we isolated ceanothine B and completed full structural characterization using NMR, Marfey’s analysis, and MS/MS fragmentation (Supporting Information File 1, Figure S2
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Published 11 Jul 2024

Primary amine-catalyzed enantioselective 1,4-Michael addition reaction of pyrazolin-5-ones to α,β-unsaturated ketones

  • Pooja Goyal,
  • Akhil K. Dubey,
  • Raghunath Chowdhury and
  • Amey Wadawale

Beilstein J. Org. Chem. 2024, 20, 1518–1526, doi:10.3762/bjoc.20.136

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  • measured by HPLC analysis using a stationary phase chiral column. Synthesis of 3aa on preparative scale. Proposed reaction mechanism. Optimization of reaction conditions.a Supporting Information Supporting Information File 2: Additional optimization studies, characterization data of compounds 3aa–na and
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Published 09 Jul 2024

Photoswitchable glycoligands targeting Pseudomonas aeruginosa LecA

  • Yu Fan,
  • Ahmed El Rhaz,
  • Stéphane Maisonneuve,
  • Emilie Gillon,
  • Maha Fatthalla,
  • Franck Le Bideau,
  • Guillaume Laurent,
  • Samir Messaoudi,
  • Anne Imberty and
  • Juan Xie

Beilstein J. Org. Chem. 2024, 20, 1486–1496, doi:10.3762/bjoc.20.132

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  • respectively 71%, 41%, and 37% total yields (Scheme 1). Photophysical characterization The photoswitching properties of galactosyl azobenzenes 1–5 were realized in water or in Tris buffer containing 5 to 10% DMSO, in accordance with the biophysical evaluation conditions by using ITC. All these compounds
  • File 14: Compound characterization, detailed photochemical and photophysical procedures and copies of spectra. Acknowledgements A. Imberty and E. Gillon acknowledge support from Glyco@Alps (ANR-15-IDEX-02) and Labex Arcane/CBH- EUR-GS (ANR-17-EURE-0003). The authors would like to thank also Cyril
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Published 03 Jul 2024

Synthesis of 2-benzyl N-substituted anilines via imine condensation–isoaromatization of (E)-2-arylidene-3-cyclohexenones and primary amines

  • Lu Li,
  • Na Li,
  • Xiao-Tian Mo,
  • Ming-Wei Yuan,
  • Lin Jiang and
  • Ming-Long Yuan

Beilstein J. Org. Chem. 2024, 20, 1468–1475, doi:10.3762/bjoc.20.130

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  • Information Supporting Information File 6: Experimental procedures, characterization data, and copies of NMR spectra of all new compounds. Funding This research was founded by the National Natural Science Foundation of China (22161051, 21302163) and Yunnan XingDian Youth Talent Support Program (XDYC-QNRC
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Published 02 Jul 2024

Synthesis of 4-functionalized pyrazoles via oxidative thio- or selenocyanation mediated by PhICl2 and NH4SCN/KSeCN

  • Jialiang Wu,
  • Haofeng Shi,
  • Xuemin Li,
  • Jiaxin He,
  • Chen Zhang,
  • Fengxia Sun and
  • Yunfei Du

Beilstein J. Org. Chem. 2024, 20, 1453–1461, doi:10.3762/bjoc.20.128

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  • 3a and their derivatization. Plausible reaction mechanism. Optimization of oxidative thiocyanation of pyrazole.a Supporting Information Supporting Information File 28: Synthetic details and compound characterization data. Funding We acknowledge the National Key Research and Development Program of
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Published 28 Jun 2024

Rapid construction of tricyclic tetrahydrocyclopenta[4,5]pyrrolo[2,3-b]pyridine via isocyanide-based multicomponent reaction

  • Xiu-Yu Chen,
  • Ying Han,
  • Jing Sun and
  • Chao-Guo Yan

Beilstein J. Org. Chem. 2024, 20, 1436–1443, doi:10.3762/bjoc.20.126

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  • 2346135) and 6g (CCDC 2346136) have been deposited at the Cambridge Crystallographic Database Center (http://www.ccdc.cam.ac.uk). Supporting Information File 24: Characterization data and 1H NMR, 13C NMR, and HRMS spectra of compounds. Funding This work was financially supported by the National Natural
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Published 28 Jun 2024

Synthesis of cyclic β-1,6-oligosaccharides from glucosamine monomers by electrochemical polyglycosylation

  • Md Azadur Rahman,
  • Hirofumi Endo,
  • Takashi Yamamoto,
  • Shoma Okushiba,
  • Norihiko Sasaki and
  • Toshiki Nokami

Beilstein J. Org. Chem. 2024, 20, 1421–1427, doi:10.3762/bjoc.20.124

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  • monomers 6 with a 2-PhthN group. Electrochemical polyglycosylation of monomers 17 with a 2-azido group. Supporting Information Supporting Information File 18: Synthetic details, DFT calculations, and compound characterization data. Acknowledgements We thank Koganei Corporation (Tokyo, Japan) for donation
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Published 26 Jun 2024

Hypervalent iodine-catalyzed amide and alkene coupling enabled by lithium salt activation

  • Akanksha Chhikara,
  • Fan Wu,
  • Navdeep Kaur,
  • Prabagar Baskaran,
  • Alex M. Nguyen,
  • Zhichang Yin,
  • Anthony H. Pham and
  • Wei Li

Beilstein J. Org. Chem. 2024, 20, 1405–1411, doi:10.3762/bjoc.20.122

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  • cycle for the hypervalent iodine-catalyzed amide and alkene coupling. Hypervalent iodine-catalyzed olefin difunctionalizations background. Amide and alkene reaction optimization studies. Supporting Information Supporting Information File 14: Spectral characterization of the products and kinetic studies
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Published 24 Jun 2024

Synthesis of 1,2,3-triazoles containing an allomaltol moiety from substituted pyrano[2,3-d]isoxazolones via base-promoted Boulton–Katritzky rearrangement

  • Constantine V. Milyutin,
  • Andrey N. Komogortsev and
  • Boris V. Lichitsky

Beilstein J. Org. Chem. 2024, 20, 1334–1340, doi:10.3762/bjoc.20.117

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  • File 96: Experimental procedures, characterization data of all products, copies of 1H, 13C NMR, spectra of all new compounds, and X-ray crystallographic data. Acknowledgements The crystal structure determination was performed in the Department of Structural Studies of Zelinsky Institute of Organic
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Published 11 Jun 2024

Transition-metal-catalyst-free electroreductive alkene hydroarylation with aryl halides under visible-light irradiation

  • Kosuke Yamamoto,
  • Kazuhisa Arita,
  • Masami Kuriyama and
  • Osamu Onomura

Beilstein J. Org. Chem. 2024, 20, 1327–1333, doi:10.3762/bjoc.20.116

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  • Supporting Information Supporting Information File 94: Experimental procedures, characterization data, and copies of NMR spectra of the products. Acknowledgements The spectral data were collected with the research equipment shared in the MEXT Project for promoting public utilization of advanced research
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Published 10 Jun 2024

Diameter-selective extraction of single-walled carbon nanotubes by interlocking with Cu-tethered square nanobrackets

  • Guoqing Cheng and
  • Naoki Komatsu

Beilstein J. Org. Chem. 2024, 20, 1298–1307, doi:10.3762/bjoc.20.113

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  • . Characterization of the extracted SWNTs To evaluate the diameter enrichment of the extracted SWNTs, Raman spectra are measured at 488, 633 and 785 nm excitation wavelengths for the p-SWNTs. In the RBM region, the Raman shift of the signal is known to be inversely proportional to the diameter of SWNTs. Even though
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Published 05 Jun 2024

Phenotellurazine redox catalysts: elements of design for radical cross-dehydrogenative coupling reactions

  • Alina Paffen,
  • Christopher Cremer and
  • Frederic W. Patureau

Beilstein J. Org. Chem. 2024, 20, 1292–1297, doi:10.3762/bjoc.20.112

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  • the Te(II)-catalyzed benchmark dehydrogenative phenothiazination of phenols, a reaction that we discovered in 2015 [35][36][37], under analogous conditions as previously described [30][31][32]. The results are summarized in Scheme 2. The multistep synthesis and characterization of all Te-based
  • characterization of synthesized compounds. Acknowledgements Pola A. Hild and Steffen Schauerte, both students at the RWTH Aachen University, are acknowledged for short internships in the group on topics peripherally related to this research. Funding DFG-funded transregional collaborative research center SFB/TRR
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Published 04 Jun 2024

Synthesis of indano[60]fullerene thioketone and its application in organic solar cells

  • Yong-Chang Zhai,
  • Shimon Oiwa,
  • Shinobu Aoyagi,
  • Shohei Ohno,
  • Tsubasa Mikie,
  • Jun-Zhuo Wang,
  • Hirofumi Amada,
  • Koki Yamanaka,
  • Kazuhira Miwa,
  • Naoyuki Imai,
  • Takeshi Igarashi,
  • Itaru Osaka and
  • Yutaka Matsuo

Beilstein J. Org. Chem. 2024, 20, 1270–1277, doi:10.3762/bjoc.20.109

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  • future. Characterization data. (a) FTIR spectra of t-Bu-FIDO and t-Bu-FIDS. (b) UV–vis spectra of fullerene derivatives normalized at 270 nm. (c) Vacuum TGA curves of t-Bu-FIDO (black), t-Bu-FIDS (red), and C60 (blue). The measurements were conducted under 0.1 Pa. (d) HPLC analyses before deposition of t
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Published 31 May 2024
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