Showing papers by "Ernst Schaumann published in 1989"
TL;DR: In this paper, carbanions react with oxiranes giving either cyclopropanes via a Homo-Peterson reaction or isomers with a shifted phenylthio residue.
24 citations
Journal Article•
TL;DR: Diphenyl- or phenyldiazomethane reacts with 1,3-disubstituted 4-imino-5-thioxo-2-imidazolidinones 1 and 5-IMino-2,4-IMIDazolidinedithiones 2 to replace the 5- or 4thiocarbonyl group with the diphenyl 3,4 or the phenylmethylene 5,6 system as mentioned in this paper.
Abstract: Diphenyl- or phenyldiazomethane reacts with 1,3-disubstituted 4-imino-5-thioxo-2-imidazolidinones 1 and 5-imino-2,4-imidazolidinedithiones 2 to replace the 5- or 4-thiocarbonyl group with the diphenyl-3,4 or the phenylmethylene 5,6 system
15 citations
TL;DR: In this paper, the relative configuration of silylcyclo-propanes with chloro(phenylthio) carbene was proven by an X-ray structural analysis.
9 citations
TL;DR: In this paper, the silyl group was replaced by Lewis acid activated S-ethyl chlorothiocarbonate to give thiocarboxylates, which is a type of cyclopropylsilane.
Abstract: ipso-Substitution of the silyl group in vinylsilanes or cyclopropylsilane by Lewis acid activated S-ethyl chlorothiocarbonate gives thiocarboxylates.
7 citations
TL;DR: In this paper, a smooth addition of allylsilanes to epoxides with variable α, γ regioselectivity yielding the C-silylated enols 5,7 and 6,8 was described.
Abstract: Lithiated allylsilanes 1 undergo smooth addition to epoxides 4 with variable α, γ regioselectivity yielding the C-silylated enols 5,7 and 6,8, respectively. γ-Selectivity can be successfully enhanced by use of cuprates.
1 citations
TL;DR: In this article, the silyl group was replaced by Lewis acid activated S-ethyl chlorothiocarbonate to give thiocarboxylates, which is a type of cyclopropylsilane.
Abstract: ipso-Substitution of the silyl group in vinylsilanes or cyclopropylsilane by Lewis acid activated S-ethyl chlorothiocarbonate gives thiocarboxylates.
TL;DR: In this paper, the relative configuration of silylcyclo-propanes with chloro(phenylthio) carbene was proven by an X-ray structural analysis.
Abstract: Vinylsilanes 1d-h react with chloro(phenylthio)carbene 2 to give functionalized silylcyclo-propanes 3 with high Z-stereoselectivity. For 3g, the relative configuration was proven by an X-ray structural analysis. Synthetic modifications of 3 include elimination, oxidation, and substitution to give products 5, 6, and 7a-f, respectively.