Showing papers by "Yu. A. Strelenko published in 1991"
TL;DR: In this paper, the authors showed that the dimerization of vinyl ketones at 80°C in the presence of the catalytic system [RhCl(C 2 H 4 ) 2 ] 2 MCl 2 leads preferably to either α, β-unsaturated 1,6-diketones RC(O)CHCHCH 2 CH 2 C(O), II when M = Ge or to diene 1, 6-ketones R, III if M = Sn.
13 citations
TL;DR: New azoxy compounds, containing an azoxy group directly bonded to a phosphorus atom, have been prepared by the reaction of nitroso derivatives with amidophosphonates in the presence of dibromoisocyanurate.
6 citations
TL;DR: In the synthesis of diaziridines from amines, carbonyl compounds, and NaOCl in water, the yields of 1,2-dialkyldiaziridis and 1, 2,3-trisubstituted diazidines with electron-withdrawing substituents in the side chain are less sensitive to changes in pH than those of simple alkyl substituent.
Abstract: In the synthesis of diaziridines from amines, carbonyl compounds, and NaOCl in water, the yields of 1,2-dialkyldiaziridines and of 1,2,3-trisubstituted diaziridines prepared from amines with electron-withdrawing substituents in the side chain are less sensitive to changes in pH than the yields of 1,2,3-trialkyldiaziridines with simple alkyl substituents. The formation of 1,5-diazabicyclo[3.1.0]hexanes is insensitive to the pH in 6.5–13.0 range. This difference is explained by the occurrence of two competing pathways to the key intermediate,N-chloroaminal.
5 citations
TL;DR: In this article, a new method was developed for the synthesis of alkylaryldiazene oxides by the reactions of t-BuNHMgBr with nitrobenzenes.
Abstract: A new method has been developed for the synthesis of alkylaryldiazene oxides by the reactions of t-BuNHMgBr with nitrobenzenes. The cis-azoxy compound 1-tert-butyl-2-(2-chlorophenyl)diazene-2-oxide, which irreversibly isomerizes to the trans isomer upon heating, was obtained for the first time under chemical reaction conditions.
4 citations
TL;DR: In this article, the previously unknown N′-(α-acetoximinoalkyl)diazene-Noxides, which under gaseous NH3 or oxalic acid in methanol lose the acetyl group and as a result are transformed into the previously known N′(α-hydroximinoylamidoximes-noxides).
Abstract: Nitroso compounds of the aromatic and aliphatic series react with O-acetylalkanoylamidoximes in the presence of dibromoisocyanurate, forming the previously unknown N′-(α-acetoximinoalkyl)diazene-N-oxides, which under gaseous NH3 or oxalic acid in methanol lose the acetyl group and as a result are transformed into the previously unknown N′-(α-hydroximinoalkyl)diazene-N-oxides.
4 citations
TL;DR: In this article, the homolytic heterocyclization of dialkyl and diaryl-acetylenes with 1,2-ethanedithiol leads stereoselectively to cis-2,3-disubstituted 1,4-dithianes.
Abstract: The homolytic heterocyclization of dialkyl- and diaryl-acetylenes with 1,2-ethanedithiol leads stereoselectively to cis-2,3-disubstituted 1,4-dithianes. The stereochemistry of the reactions is determined by a combination of homolytic trans addition at the triple bond and intramolecular homolytic cis addition at the double bond. The main product of the heterocyclization of dimethyl acetylenedicarboxylate is dimethyl 5,6-dihydro-1,4-dithiin-2,3-dicar-boxylate.
3 citations
TL;DR: In this paper, 1,4-dichloro-1,4bis(perfluoroalkyl)-1,3-diazatetra-1-3-Dienes have been shown to be mixtures of isomers of Z and E configurations.
Abstract: Previously unknown 1,4-dichloro-1,4-bis(perfluoroalkyl)-1,3-diazatetra-1,3-Dienes have been prepared and shown to be mixtures of isomers of Z and E configurations. The structures have been identified and a quantitative estimate made of the ratio of Z and E isomers using13C,19F, and15N NMR spectroscopy.
TL;DR: Phenylhydrazine reacts with S-methylisothionitrourea to give 2-phenyl-hydrazino-N2-nitroformamidine as mentioned in this paper.
Abstract: Phenylhydrazine reacts with S-methylisothionitrourea to give 2-phenylhydrazino-N2-nitroformamidine, which on oxidation and nitration affords novel arylazo and arylazoxy-N2-nitroformamidines. The structures of the products were confirmed by1H13C, and14N NMR.