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Search for "amines" in Full Text gives 855 result(s) in Beilstein Journal of Organic Chemistry. Showing first 200.

SOMOphilic alkyne vs radical-polar crossover approaches: The full story of the azido-alkynylation of alkenes

  • Julien Borrel and
  • Jerome Waser

Beilstein J. Org. Chem. 2024, 20, 701–713, doi:10.3762/bjoc.20.64

Graphical Abstract
  • building blocks bearing two of the most versatile functional groups, allowing a rich panel of functionalization. They have been used as intermediates in numerous syntheses to access bioactive compounds [1][2][3][4] or materials [5][6][7]. In addition, azide reduction affords homopropargylic amines, which
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Published 03 Apr 2024

Regioselective quinazoline C2 modifications through the azide–tetrazole tautomeric equilibrium

  • Dāgs Dāvis Līpiņš,
  • Andris Jeminejs,
  • Una Ušacka,
  • Anatoly Mishnev,
  • Māris Turks and
  • Irina Novosjolova

Beilstein J. Org. Chem. 2024, 20, 675–683, doi:10.3762/bjoc.20.61

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  • of quinazolines. A scope of 2-amino-4-azido-6,7-dimetoxyquinazolines 17 was synthesized. For pyrrolidine, selective C2 substitution was achieved in a non-polar solvent such as CHCl3. Less nucleophilic amines gave C2-selective SNAr in MeCN. To apply the developed technique to the synthesis of
  • pharmaceutically active substances such as terazosin and prazosin, nucleophilic substitution at the C2 position was carried out with the corresponding amines – piperazin-1-yl(tetrahydrofuran-2-yl)methanone and furan-2-yl(piperazin-1-yl)methanone to give products 17e and 17f. Products 17e,f can be obtained through
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Published 28 Mar 2024

Palladium-catalyzed three-component radical-polar crossover carboamination of 1,3-dienes or allenes with diazo esters and amines

  • Geng-Xin Liu,
  • Xiao-Ting Jie,
  • Ge-Jun Niu,
  • Li-Sheng Yang,
  • Xing-Lin Li,
  • Jian Luo and
  • Wen-Hao Hu

Beilstein J. Org. Chem. 2024, 20, 661–671, doi:10.3762/bjoc.20.59

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  • -light-mediated palladium-catalyzed three-component radical-polar crossover carboamination of 1,3-dienes or allenes with diazo esters and amines, affording unsaturated γ- and ε-amino acid derivatives with diverse structures. In this methodology, the diazo compound readily transforms into a hybrid α-ester
  • be difficult to achieve using either radical or polar chemistry alone. In recent years, Gevorgyan, Glorius, Huang and their co-workers reported elegant examples of the carboamination of 1,3-dienes with unactivated alkyl halides and amines under photoinduced palladium catalysis via a radical-polar
  • reactant ratio produced the desired product 4a in 84% yield as optimal conditions for this protocol (Table 1, entry 13). With the optimized conditions obtained, we examined the generality of our palladium-catalyzed regioselective carboamination of 1,3-dienes with diazo esters and amines (Scheme 2). First
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Published 27 Mar 2024

Ligand effects, solvent cooperation, and large kinetic solvent deuterium isotope effects in gold(I)-catalyzed intramolecular alkene hydroamination

  • Ruichen Lan,
  • Brock Yager,
  • Yoonsun Jee,
  • Cynthia S. Day and
  • Amanda C. Jones

Beilstein J. Org. Chem. 2024, 20, 479–496, doi:10.3762/bjoc.20.43

Graphical Abstract
  • ], to 3–5 [22][73][74]. The lack of KIE measured here for deuterated 1a thus presumes fast protodeauration. Deuterium KIE’s for intramolecular alkene hydroamination with N-protected amines such as the ones in this study, had not previously been quantified, but in Michon’s study of carbamate
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Published 29 Feb 2024

Synthesis of 2,2-difluoro-1,3-diketone and 2,2-difluoro-1,3-ketoester derivatives using fluorine gas

  • Alexander S. Hampton,
  • David R. W. Hodgson,
  • Graham McDougald,
  • Linhua Wang and
  • Graham Sandford

Beilstein J. Org. Chem. 2024, 20, 460–469, doi:10.3762/bjoc.20.41

Graphical Abstract
  • -diketone 2a. Supplementation of the reaction mixture with either a tertiary amine or inorganic base led to varying mixtures of mono- and difluoro products 2a and 3a, respectively, with the tertiary amines proving most effective. Inorganic bases offer the possibility of deprotonating 1a-enol to form a more
  • reactive enolate 1a-enolate. Nitrogen-centered bases react with fluorine gas to form N-fluoroammonium fluorides and fluoride ion [49]. Thus, on addition of tertiary amines, fluorine can react to generate basic fluoride ions and deliver reactive, electrophilic N–F species. Given that Selectfluor is
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Published 28 Feb 2024

(E,Z)-1,1,1,4,4,4-Hexafluorobut-2-enes: hydrofluoroolefins halogenation/dehydrohalogenation cascade to reach new fluorinated allene

  • Nataliia V. Kirij,
  • Andrey A. Filatov,
  • Yurii L. Yagupolskii,
  • Sheng Peng and
  • Lee Sprague

Beilstein J. Org. Chem. 2024, 20, 452–459, doi:10.3762/bjoc.20.40

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  • 1b. Wherein various alkyl and aryl olefins, including those that contain Lewis basic esters, carbamates and amines or α-branched moieties, may be used in efficient and exceptionally Z-selective cross-metathesis reactions [6][7][8]. A few years ago, some publications devoted to the cleavage of the C–F
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Published 27 Feb 2024

Mechanisms for radical reactions initiating from N-hydroxyphthalimide esters

  • Carlos R. Azpilcueta-Nicolas and
  • Jean-Philip Lumb

Beilstein J. Org. Chem. 2024, 20, 346–378, doi:10.3762/bjoc.20.35

Graphical Abstract
  • nucleophilic substitution takes place to afford products of the type 155 (Scheme 31B). Representative examples of the substrate scope are shown in Scheme 31C. The in situ-generated phthalimidyl anion (–Nphth) is a competent nucleophile and gives rise to primary protected amines such as 156. Additionally
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Published 21 Feb 2024

Facile approach to N,O,S-heteropentacycles via condensation of sterically crowded 3H-phenoxazin-3-one with ortho-substituted anilines

  • Eugeny Ivakhnenko,
  • Vasily Malay,
  • Pavel Knyazev,
  • Nikita Merezhko,
  • Nadezhda Makarova,
  • Oleg Demidov,
  • Gennady Borodkin,
  • Andrey Starikov and
  • Vladimir Minkin

Beilstein J. Org. Chem. 2024, 20, 336–345, doi:10.3762/bjoc.20.34

Graphical Abstract
  • probes, organic light-emitting diodes, and organic solar cells [2][7][8][9]. The principal way for the preparation of these heterocycles involves the coupling of 3H-phenoxazin-3-ones with variously functionalized aromatic amines. This is followed by the cyclization of the initially formed adducts [10][11
  • highly basic amines (Scheme 1) [6]. The choice for one of the other two possible reaction pathways (nucleophilic additions to either the C(1) or C(2) center) critically depends on the electrophilicity. Figure 1 shows the distribution of electronic density in 6,8-di-tert-butyl-3H-phenoxazin-3-one (1
  • amines, the direction of which is controlled by the large positive charge at the C(2) center of the p-quinone imine moiety of the heterocycle. With this in mind, we turned our attention to solid-state organic reactions. Numerous examples of nucleophilic substitutions at carbon centers are discussed in
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Published 21 Feb 2024

Synthesis of π-conjugated polycyclic compounds by late-stage extrusion of chalcogen fragments

  • Aissam Okba,
  • Pablo Simón Marqués,
  • Kyohei Matsuo,
  • Naoki Aratani,
  • Hiroko Yamada,
  • Gwénaël Rapenne and
  • Claire Kammerer

Beilstein J. Org. Chem. 2024, 20, 287–305, doi:10.3762/bjoc.20.30

Graphical Abstract
  • (Na2S) to afford dinaphthothiepinetetracarboxylic anhydride 12 as key precursor of a series of thiepine bisimides bearing diverse substituents. Due to its very low solubility, the tetracarboxylic anhydride 12 was not isolated and was directly reacted with a variety of amines to yield the target soluble
  • precursors 3a–f. Diverse primary alkylamines were well tolerated, also when an electron-withdrawing polyfluoroalkyl group (3d) was included, and bulkier amines, such as 3-pentylamine (3e) or trimethylaniline (3f), could also be inserted. As a matter of fact, the choice of amines was limited by the
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Published 15 Feb 2024

Nucleophilic functionalization of thianthrenium salts under basic conditions

  • Xinting Fan,
  • Duo Zhang,
  • Xiangchuan Xiu,
  • Bin Xu,
  • Yu Yuan,
  • Feng Chen and
  • Pan Gao

Beilstein J. Org. Chem. 2024, 20, 257–263, doi:10.3762/bjoc.20.26

Graphical Abstract
  • reaction system, yielding product 3ak in good yield. Furthermore, heteroaromatic rings, such as pyridine (2l), thiophene (2m), benzoxazole (2n), and benzimidazole (2o) all afforded the desired products (3al–ao) in satisfactory yields. Subsequently, we investigated the substrate scope of amines, which is
  • outlined in Scheme 3. To our delight, various amines (2p–r), including aniline, N-methylaniline, and naphthylmethylamine are also compatible under the optimal conditions to give the corresponding amination products (3ap–ar) in moderate to high yields. For this amination method, it was necessary to
  • engage in reactions with electrophilic reagents like thiophenol or amines under alkaline conditions, facilitating the formation of respective C–N/O bonds. The synthesis of alkylthianthrenium salts requires alkyl trifluoromethanesulfonate as a precursor, which can also act as an electrophile. However
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Published 08 Feb 2024

Substitution reactions in the acenaphthene analog of quino[7,8-h]quinoline and an unusual synthesis of the corresponding acenaphthylenes by tele-elimination

  • Ekaterina V. Kolupaeva,
  • Narek A. Dzhangiryan,
  • Alexander F. Pozharskii,
  • Oleg P. Demidov and
  • Valery A. Ozeryanskii

Beilstein J. Org. Chem. 2024, 20, 243–253, doi:10.3762/bjoc.20.24

Graphical Abstract
  • effect of functional groups on the further chemistry and basicity of the newly synthesized derivatives is also considered. Results and Discussion Amination, dehydrogenation, and supramolecular aggregation Direct amination of quinoquinoline 5 could potentially lead to 2(11)-substituted amines 6 (Figure 1
  • ), the basicity of which must obviously be higher than that of the starting heterocycle 5. To this end, we conducted a series of experiments on its oxidative amination by varying the reaction conditions (time, temperature, addition of n-butyllithium to increase the nucleophilicity of amines), and
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Published 08 Feb 2024

Photochromic derivatives of indigo: historical overview of development, challenges and applications

  • Gökhan Kaplan,
  • Zeynel Seferoğlu and
  • Daria V. Berdnikova

Beilstein J. Org. Chem. 2024, 20, 228–242, doi:10.3762/bjoc.20.23

Graphical Abstract
  • crystalline form [55]. It was found that the aliphatic substituents (diacetyl- and distearoyl-) supported faster relaxation rates than the aryl-containing substituents (dibenzoyl- and bis(3,5-dinitrobenzoyl)-). Moreover, addition of catalytic amounts of amines accelerated the backward Z–E isomerization of Z
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Published 07 Feb 2024

Copper-catalyzed multicomponent reaction of β-trifluoromethyl β-diazo esters enabling the synthesis of β-trifluoromethyl N,N-diacyl-β-amino esters

  • Youlong Du,
  • Haibo Mei,
  • Ata Makarem,
  • Ramin Javahershenas,
  • Vadim A. Soloshonok and
  • Jianlin Han

Beilstein J. Org. Chem. 2024, 20, 212–219, doi:10.3762/bjoc.20.21

Graphical Abstract
  • system to produce the expected product (4p). In addition, the β-trifluoromethyl β-amino benzyl ester substrates 1 with different ester groups were tried to react with benzoic acid (3a) to further extend the substrate range. To our delight, both the amines with electron-donating groups (4q and 4r) and
  • General procedure for copper-catalyzed multicomponent reaction of β-amino esters Into a flask were added amines 1 (0.4 mmol), acids 3 (0.1 mmol), CuI (20 mol %), and CH3CN (2 mL). Then, the mixture was stirred at room temperature under a nitrogen atmosphere and t-BuONO (0.4 mmol) was added dropwise
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Published 02 Feb 2024

Cycloaddition reactions of heterocyclic azides with 2-cyanoacetamidines as a new route to C,N-diheteroarylcarbamidines

  • Pavel S. Silaichev,
  • Tetyana V. Beryozkina,
  • Vsevolod V. Melekhin,
  • Valeriy O. Filimonov,
  • Andrey N. Maslivets,
  • Vladimir G. Ilkin,
  • Wim Dehaen and
  • Vasiliy A. Bakulev

Beilstein J. Org. Chem. 2024, 20, 17–24, doi:10.3762/bjoc.20.3

Graphical Abstract
  • ethyl 2-cyanoacetimidate and corresponding amines according to the literature procedure [17] and compounds 1a,c–e,h–j are commercially available. Azides 2a–d,f,g were synthesized according to the literature procedures [18][19][20][21][22][23], and azide 2e is commercially available. Preparation of
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Published 05 Jan 2024

Synthesis of N-acyl carbazoles, phenoxazines and acridines from cyclic diaryliodonium salts

  • Nils Clamor,
  • Mattis Damrath,
  • Thomas J. Kuczmera,
  • Daniel Duvinage and
  • Boris J. Nachtsheim

Beilstein J. Org. Chem. 2024, 20, 12–16, doi:10.3762/bjoc.20.2

Graphical Abstract
  • diaryliodonium salts [29][31], as well as Pd-catalysed methods for synthesizing N-aryl carbazoles [32]. Similar procedures were published for the Cu-catalysed synthesis of aryl carbazoles from amines as well as other heterocycles such as N-acyl acridanes with nitriles using cyclic iodonium salts by Wen and Chen
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Published 04 Jan 2024

Anion–π catalysis on carbon allotropes

  • M. Ángeles Gutiérrez López,
  • Mei-Ling Tan,
  • Giacomo Renno,
  • Augustina Jozeliūnaitė,
  • J. Jonathan Nué-Martinez,
  • Javier Lopez-Andarias,
  • Naomi Sakai and
  • Stefan Matile

Beilstein J. Org. Chem. 2023, 19, 1881–1894, doi:10.3762/bjoc.19.140

Graphical Abstract
  • to C60 fullerenes [12]. These amines function as bases, their position next to the aromatic surface is essential to turn on anion–π interactions as soon as substrate 4 is deprotonated. Fullerene derivatization with the Bingel reaction installs a cyclopropane that continues with one or two acid
  • introduced explicitly in 2019 [13]. Already in the presence of pristine SWCNTs 2, the ability of TEA 23 to catalyze enolate addition with 4 increased to A/D48/23 = 1.2 for a virtual catalytic complex 48 between the two (Figure 8). Covalent modification of SWCNTs with tertiary amines as in 49 further
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Published 12 Dec 2023

Synthetic approach to 2-alkyl-4-quinolones and 2-alkyl-4-quinolone-3-carboxamides based on common β-keto amide precursors

  • Yordanka Mollova-Sapundzhieva,
  • Plamen Angelov,
  • Danail Georgiev and
  • Pavel Yanev

Beilstein J. Org. Chem. 2023, 19, 1804–1810, doi:10.3762/bjoc.19.132

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  • -mediated domino reaction of chromone-3-carboxaldehydes and amines [41], Pd-catalyzed redox-neutral C–N coupling reaction of iminoquinones with electron-deficient alkenes [42], NH3 insertion into o‑haloarylynones [43], gold(III)-catalyzed azide-yne cyclization [44], Michael/Truce-Smiles rearrangement
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Published 23 Nov 2023

Recent advancements in iodide/phosphine-mediated photoredox radical reactions

  • Tinglan Liu,
  • Yu Zhou,
  • Junhong Tang and
  • Chengming Wang

Beilstein J. Org. Chem. 2023, 19, 1785–1803, doi:10.3762/bjoc.19.131

Graphical Abstract
  • the ability to be readily transformed into various valuable functional molecules, including amines, hydrazines, and nitrogen-containing heterocycles [13]. In a significant advancement in 2021, Lopchuk et al. revealed a novel method for the photodecarboxylative alkylation of diazirines 12 using the
  • route for the synthesis of unnatural amino acids and amines. Remarkably, the procedure exhibited excellent compatibility with a wide range of alkyl radicals, including primary, secondary, tertiary, and α-heterosubstituted radicals generated from corresponding redox-active esters 3. Concurrently, Shang
  • novel metallaphotoredox catalysis by combining the NaI/PPh3 photoredox catalyst with a Cu(I) catalyst to accomplish diverse C–O/N cross-couplings of alkyl N-hydroxyphthalimide esters 3 with various phenols/secondary amines 30 (Scheme 13) [24]. It was anticipated the utilization of computational methods
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Published 22 Nov 2023

Decarboxylative 1,3-dipolar cycloaddition of amino acids for the synthesis of heterocyclic compounds

  • Xiaofeng Zhang,
  • Xiaoming Ma and
  • Wei Zhang

Beilstein J. Org. Chem. 2023, 19, 1677–1693, doi:10.3762/bjoc.19.123

Graphical Abstract
  • (such as C60/C70 fullerenes) [56][57][58]. Other than amino esters and amino acids shown in Scheme 1, cyclic amines can also react with arylaldehydes to form B1-type semi-stabilized AMYs. In this context, the Seidel group reported the reactions of pyrrolidines 5 with arylaldehydes for the formation of
  • AMYs B1 which then were reacted with nucleophiles to form C–H-functionalized pyrrolidines or subjected to the 1,3-dipolar cycloaddition with olefins to afford bicyclic compounds (Scheme 2A and B) [59][60]. We employed cyclic amines for the synthesis of spirooxindole-pyrrolidines 7a or 7b in good
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Published 06 Nov 2023

Synthesis of 7-azabicyclo[4.3.1]decane ring systems from tricarbonyl(tropone)iron via intramolecular Heck reactions

  • Aaron H. Shoemaker,
  • Elizabeth A. Foker,
  • Elena P. Uttaro,
  • Sarah K. Beitel and
  • Daniel R. Griffith

Beilstein J. Org. Chem. 2023, 19, 1615–1619, doi:10.3762/bjoc.19.118

Graphical Abstract
  • File 1 for amine syntheses). These amines were each carried through the protocols outlined in Scheme 2 to arrive at the deconjugated olefin substrates shown in Table 2. The cinnamylamine derivative 13 underwent the Heck cyclization in 50% yield, while the prenylamine derivative 15 proceeded to give
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Published 23 Oct 2023

Morpholine-mediated defluorinative cycloaddition of gem-difluoroalkenes and organic azides

  • Tzu-Yu Huang,
  • Mario Djugovski,
  • Sweta Adhikari,
  • Destinee L. Manning and
  • Sudeshna Roy

Beilstein J. Org. Chem. 2023, 19, 1545–1554, doi:10.3762/bjoc.19.111

Graphical Abstract
  • reactions with azoles and amines (Figure 1B) are also well-precedented [10]. Herein, we address a critical gap in the literature and report the discovery of a cycloaddition of gem-difluoroalkenes and organic azides mediated by a base and with morpholine as a solvent. The cycloaddition adducts, 1,4,5
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Published 05 Oct 2023
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  • , these compounds are capable of forming complexes with small organic molecules. The current paper focuses on the synthesis of complexes between R[4]A and secondary aliphatic amines (sec-amines). Through NMR spectroscopy, it was observed that “in-out” complexes are formed depending on the solvent. It was
  • as chloroform and toluene, in which the forming structures are stabilized by hydrogen bonds. The last few years have seen an increase in works showing the course of various types of reactions in the cavities of hexameric systems (closed spaces) created by R[4]A [8]. Complexes of R[4]A with amines [9
  • ], amino alcohols [10], and amino acids [11] have been studied due to their potential applications in supramolecular chemistry, drug delivery, and molecular recognition. The complexation of R[4]A with amines is based on the formation of hydrogen bonds between the hydroxy groups of the resorcinol units and
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Published 29 Sep 2023

N-Sulfenylsuccinimide/phthalimide: an alternative sulfenylating reagent in organic transformations

  • Fatemeh Doraghi,
  • Seyedeh Pegah Aledavoud,
  • Mehdi Ghanbarlou,
  • Bagher Larijani and
  • Mohammad Mahdavi

Beilstein J. Org. Chem. 2023, 19, 1471–1502, doi:10.3762/bjoc.19.106

Graphical Abstract
  • selectively transfer the acyl or acylthio moieties. Arylboronic acids 74 and amines 76 were suitable for the acyl transfer and led to ketones 78 and amides 80 as the desired products. While, Grignard reagents 75 and thiols 77 acted as soft nucleophiles and resulted in thioesters 79 and acyl disulfides 81
  • , respectively. It should be noted that the use of a palladium catalyst was essential for the cross-coupling reaction between 1’’’ and 74. Also, the presence of ZnCl2 could facilitate the cleavage of the N–S bond. In the case of amines and thiols, there was no need for a metal catalyst for the formation of S–N
  • the product 162 and regenerated HX. In path II, I reacted with nucleophile 161 to produce a byproduct, phthalimide, and HX (Scheme 70). The coupling reaction was influenced by nucleophilic properties and the steric effect of the nucleophile reagents. In the same year, the treatment of amines with N
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Published 27 Sep 2023

α-(Aminomethyl)acrylates as acceptors in radical–polar crossover 1,4-additions of dialkylzincs: insights into enolate formation and trapping

  • Angel Palillero-Cisneros,
  • Paola G. Gordillo-Guerra,
  • Fernando García-Alvarez,
  • Olivier Jackowski,
  • Franck Ferreira,
  • Fabrice Chemla,
  • Joel L. Terán and
  • Alejandro Perez-Luna

Beilstein J. Org. Chem. 2023, 19, 1443–1451, doi:10.3762/bjoc.19.103

Graphical Abstract
  • primary amines 1–3 with methyl α-(bromomethyl)acrylate was contemplated first under several typical conditions that all afforded non-synthetically useful mixtures of mono- and diallylation, even if excess of the nitrogen nucleophiles was used. An alternative strategy was thus developed relying on the
  • allylation of lithium (trimethylsilyl)amides prepared in situ from the parent amines by a lithiation/silylation/lithiation sequence (Table 1). Using this protocol, α-(aminomethyl)acrylates 5 and 6 derived from benzhydrylamine and aniline were prepared in high yields (Table 1, entries 1 and 2). The procedure
  • of primary amines and tert-butylsulfinamide (preparation of compounds 5–7 and 8a–c). In a round-bottomed flask under argon, n-BuLi (1.0 equiv, soln. in heptane) was added dropwise to a THF (0.2 mol·L−1) solution of the appropriate primary amine or tert-butylsulfinamide (1.0 equiv) at −55 °C. The
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Published 21 Sep 2023

Application of N-heterocyclic carbene–Cu(I) complexes as catalysts in organic synthesis: a review

  • Nosheen Beig,
  • Varsha Goyal and
  • Raj K. Bansal

Beilstein J. Org. Chem. 2023, 19, 1408–1442, doi:10.3762/bjoc.19.102

Graphical Abstract
  • Cu···Cu distance of ca. 2.3 Å was detected in these complexes. In 2017, Romanov et al. synthesized a series of amido and (phenolato)Cu–NHC complexes from the reaction of (AdL)MCl (M = Cu, Au) with phenols, thiophenols, or aromatic amines in the presence of NaOt-Bu at rt in anhydrous THF (Scheme 30
  • (Scheme 55). A wide range of combinations of aldehydes, alkynes, and secondary amines including aromatic as well as aliphatic substrates were used and the products were obtained in up to 95% yield. The effects of solvents and temperature were also investigated. Polar solvents such as acetone or
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Published 20 Sep 2023
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