Stereoisomeric Unsaturated Triaroylethylenes. Reductive-furanization and Cis-addition-furanization
作者:CHI-KANG. DIEN、ROBERT E. LUTZ
DOI:10.1021/jo01118a043
日期:1956.12.1
A novel synthesis of alkylbismuthonium salts and their reaction with some nucleophiles. First X-ray structural analysis of a stabilized alkylbismuthonium tetrafluoroborate
作者:Yoshihiro Matano、Nagao Azuma、Hitomi Suzuki
DOI:10.1016/s0040-4039(00)61358-8
日期:1993.1
Treatment of triarylbismuth difluorides 1 with silyl enol ethers 2 in the presence of BF3·OEt2 gives (2-oxoalkyl)triarylbismuthonium tetrafluoroborates 3 as a stable crystalline solid, the bismuth centre of which has been found by X-ray analysis to possess a tetragonal geometry. The 2-oxoalkyl moiety of compound 3 couples with enolates and thiolates to afford the corresponding triketones 4 and α-thioketones