Einfache Synthesen von 1,2-Diaryl- und Triarylethenen mit trägergebundenen Fluoridbasen
作者:D. Hellwinkel、K. Göke、R. Karle
DOI:10.1055/s-1994-25617
日期:——
Facile Syntheses of 1,2-Diaryl- and Triarylethenes with Supported Fluoride Bases Differently substituted arenecarbaldehydes, mainly benzaldehydes, can be very efficiently condensed with a wide variety of methylbenzenes having an electron-withdrawing group in the para-position, as well as with fluorenes, xanthene, cyclopentadienes and indenes by using a standardized KF- or CsF-Al2O3 base system in dimethylformamide.
Ligand coupling through σ-sulfurane — complete retention of geometric configuration of allylic and vinylic groups in the reactions of allylic and vinylic sulfoxides with Grignard reagents
作者:Shigeru Oae、Takashi Takeda、Shoji Wakabayashi
DOI:10.1016/s0040-4039(00)80518-3
日期:1988.1
The reaction of p-benzenesulfonylphenyl crotyl sulfoxide with Grignard reagents is considered to proceed via formation of an incipient σ-sulfurane to afford the coupling product, p-benzenesulfonyl-crotylbenzene, in which the geometric configuration of crotyl group was completely preserved. No rearrangement was observed in the couplingreaction of p-benzenesulfonylphenyl α-methylallyl sulfoxide. Such