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1-Dimethylsilyl- and 1,3-bis(dimethylsilyl)adamantane have been prepared in low yield by Wurtz reaction of dimethylchlorosilane with 1-chloroadamantane or 1,3-dichloroadamantane, respectively. On the other hand, reaction of phenyldimethylsilyllithium with 1-bromoadamantane or 1,3-dibromoadamantane gives essentially quantitative yields of 1-phenyldimethylsilyladamantane or 1,3-bis(phenyldimethylsilyl)adamantane, respectively. 相似文献
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N. S. Prostakov A. V. Varlamov V. P. Zvolinskii G. I. Cherenkova Butros Musa Butros Maria Elena Sintra 《Chemistry of Heterocyclic Compounds》1976,12(4):421-424
1,2 5-Trimethyl-4-(methyldiphenylsilyl)- and 4-(dimethylphenyl)silyl-4-piperidols were obtained. The isomers of these piperidols of the series, which exist in the chair conformation, have all of their substituents, except the hydroxyl group, equatorially oriented. The isomers of the series exist in solution in the form of an equilibrium mixture of chair and boat conformations, and all of the substituents, except the silyl grouping, are equatorially oriented in the chair conformation.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 502–505, April, 1976. 相似文献
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A procedure was developed for monoarylation of sulfones with aryl halides in the presence of palladium complexes. Optimal reaction conditions were found, and the scope of application of the proposed procedure was determined. The arylation occurs only with those sulfones which are relatively strong CH acids; the corresponding monoarylated sulfones are formed in moderate to high yields. The arylation of carbanions derived from the sulfones and some other CH acids requires the presence of an additional equivalent of base. The presence of the latter is also necessary in stoichiometric reactions of carbanions with the palladium complex CF3C6H4Pd(PPh3)2Br; no reaction occurs in the absence of a base. A new mechanism of arylation was proposed, where the key stage is deprotonation of palladium intermediate ArPdL2CHXY which activates the reductive elimination stage. 相似文献
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Martin Nielsen Dr. Christian Borch Jacobsen Nicole Holub Dr. Marcio Weber Paixão Dr. Karl Anker Jørgensen Prof. Dr. 《Angewandte Chemie (International ed. in English)》2010,49(15):2668-2679
Asymmetric organocatalysis has become a powerful tool for the synthesis of optically active compounds. Whereas early research mainly focused on combining simple reagents as a proof‐of‐concept for asymmetric organocatalysis, recent investigations are directed towards extending the concept to more target‐ and diversity‐oriented synthesis. As a result of the many transformation possibilities and their ability to generate both nucleophilic and electrophilic reaction partners, sulfones have become especially important substrates in the field of organocatalysis. 相似文献
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Depending on the solvent nature, addition of benzeneselenols to aryl ethynyl sulfones leads to formation of a mixture of (E)- and (Z)-1-arylseleno-2-arylsulfonylethenes and 1-arylseleno-1-arylsulfonylethenes (in carbon tetrachloride and cyclohexane) or (Z)-1-arylseleno-2-arylsulfonylethenes as a single product (in alcohols). 相似文献
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[reaction: see text] A conjugated pi-electron compound, 2-aryl-3-silyl-1,3-butadiene, was easily prepared from 1-benzyloxy-3-silyl-2-propyne, bis(iodozincio)methane, and an aryl halide in the presence of nickel catalyst. A subsequent cross-coupling reaction of the product with another aryl halide gave an unsymmetrical 2,3-diaryl-1,3-butadiene efficiently. 相似文献
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Two 4-silyl-3-buten-2-ones, 2a and 2c, underwent an interesting rearrangement involving migration of the allyl or phenyl group on the silicon atom to the adjacent enone carbon when treated with various bases. 相似文献
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Grigor'eva A. A. Shainyan B. A. Kaurova G. I. Gracheva E. I. Lesnevskaya N. B. Barabanov V. G. 《Russian Journal of Applied Chemistry》2002,75(7):1095-1100
Electrochemical fluorination of some unsaturated sulfides and sulfones and their reactions with anhydrous HF were studied. 相似文献
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Cyclopropanation of the title compounds is possible under certain conditions (CH2I2---Sm (Hg)) in special cases, but epoxidation is apparently a general reaction which occurs readily in a stereospecific manner when they are treated with m-chloroperbenzoic acid. 相似文献
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An efficient synthesis of vinyl sulfones 3a-o from aryl methyl ketones 2 bearing an electron withdrawing group and the phosphonic ester 1 under sonochemical conditions is reported. These compounds are generally obtained as an E/Z mixture. Formation of the allyl sulfones 4 is also observed. 相似文献
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Treatment of β-trimethylsilyl-α,β-unsaturated esters with diazomethane results in a stereospecific homolgation to the corresponding γ-trimethylsilyl-α,β-unsaturated esters. 相似文献
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P. R. Sharma Vandana Gupta D. C. Gautam R. R. Gupta 《Phosphorus, sulfur, and silicon and the related elements》2013,188(7):1483-1488
The synthesis of 7-bromo/5,6-dimethyl-4 H -1,4-benzothiazines and their conversion into sulfones is reported. The 7-bromo/5,6-dimethyl-4 H -1,4-benzothiazines were synthesized by the condensation and oxidative cyclization of 2-amino-5-bromo/3,4-dimethylbenzenethiol with g -diketones in dimethyl sulfoxide. The reaction is believed to proceed via an enaminoketone system. 4 H -1,4-Benzothiazine sulfones have been synthesized by the oxidation of 4 H -1,4-benzothiazines using 30% H 2 O 2 in glacial acetic acid. The structures of all newly synthesized compounds have been confirmed by elemental analysis and spectral studies. 相似文献
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Cyclopropanation of vinyl sulfones and vinyl sulfides can be achieved by phase transfer catalysis where other cyclopropanation methods have failed. 相似文献
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Prof. Dr. Masakazu Nambo Yasuyo Tahara Dr. Jacky C.-H. Yim Prof. Dr. Cathleen M. Crudden 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(8):1923-1926
A new method for the synthesis of benzhydryl amines from the reaction of readily available sulfone derivatives with amines is described. The Cu-catalyzed desulfonylative amination not only provides structurally diverse benzhydryl amines in good yields, but is also applicable to iterative and intramolecular aminations. Control experiments suggested that the formation of a Cu-carbene intermediate generated from the sulfone substrate, which represents a new route for desulfonylative transformations. 相似文献
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V. Cozan A. Butuc A. Stoleru M. Rusu Yushan Ni Mengxian Ding 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(12):899-906
Abstract New copolyether sulfones containing 2,5-bis(4-oxo-benzylidene)-cyclopentanone moieties were prepared in the conventional literature manner by condensing the dipotassium salts of 2,5-bis(4-hydroxyphenzyl- idene)cyclopentanone (I) and 2, 2-bis(4-hydroxyphenyl)propane (Bisphenol A, III) with 4,4′-dichlorodiphenyl sulfone (II), or by condensing the dipotassium salts of I with chlorine-terminated Bisphenol A-4,4′-di-chlorodiphenylsulfone copolymers (V). The resulting copolyether sulfones were confirmed by IR, viscometry, DSC measurements, thermooptical (TOA), and thermogravimetric analysis (TGA). 相似文献
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2-Phenyl-4-trifluoromethylsulfonylmethyl-2H-1,2,3-triazole was synthesized from 4-bromo-methyl-2-phenyl-2H-1,2,3-triazole and sodium trifluoromethanesulfinate CF3SO2Na. 1(2)-Ethyl-4-nitro-1(2)H-1,2,3-triazoles and 4-nitro-2-phenyl-2H-1,2,3-triazole were reduced to the corresponding amines. Intermediate 1,2-bis(1-ethyl-1H-1,2,3-triazol-4-yl)diazene 1-oxide exists as a mixture of syn and anti isomers, the former being stabilized via formation of a strong intramolecular hydrogen bond. The reduction of 2-ethyl-4-nitro-2H-1,2,3-triazole in the presence of HCl afforded the target 4-amino-2-ethyl-2H-1,2,3-triazole and also 4-amino-5-chloro-2-ethyl-2H-1,2,3-triazole. Treatment of alkyl-substituted 4-amino-1,2,3-triazoles with trifluoromethanesulfonyl chloride and pentafluoroethanesulfonyl chloride gave N-triazolyl-substituted trifluoromethane- and pentafluoroethanesulfonamides and -imides. 相似文献