Introduction stéréosélective du groupement difluorométhylène en position allylique
作者:Frédérique Tellier、Raymond Sauvêtre
DOI:10.1016/0022-1139(94)03126-k
日期:1995.2
The regio- and stereo-selective introduction of a difluoromethylene group in an allylic position is described. The key step is the treatment of 1,1-difluoro-1-alken-3-acetates with Grignard reagents in the presence of copper and lithium salts.
Cis-trans isomerization of an α,α-difluoroolefin catalyzed by bromine
作者:Marek Masnyk、Josef Fried
DOI:10.1016/s0040-4039(00)99213-x
日期:1989.1
The cis-trans isomerization of by Br2 in CCl4 is described. A bridgedbromonium cation α to CF2 is destabilized resulting in a carbocation bromide ion pair at the β-carbon capable of free rotation and loss of bromine to form . A CF2 group appears to be more effective in promoting isomerization than aryl in the case of stilbenes.
Stereoselective syntheses of 3,3-difluoro-1-propene derivatives
作者:Frédérique Tellier、Raymond Sauvêtre
DOI:10.1016/s0040-4039(00)60400-8
日期:1993.11
A highly regio- and stereo-selective introduction of a difluoromethylene group in allylic position is described. The key step is the treatment of 3-acetoxy-1,1-difluoro-1-propenes with Grignard reagents in the presence of copper and lithium salts.
MASNYK, MAREK;FRIED, JOSEF, TETRAHEDRON LETT., 30,(1989) N5, C. 3247-3250
作者:MASNYK, MAREK、FRIED, JOSEF
DOI:——
日期:——
MASNYK, MAREK;FRIED, JOSEF;ROELOFS, WENDELL, TETRAHEDRON LETT., 30,(1989) N5, C. 3243-3246