The stereospecific preparation of (E)-1,2-difluoro-1,2-disubstituted alkenes
作者:Long Lu、Donald J. Burton
DOI:10.1016/j.jfluchem.2012.02.010
日期:2012.11
(Z)-1,2-difluoro-2-substituted vinyl silanes were prepared stereospecifically from chlorotrifluoroethene, chlorotrimethylsilane and alkyl or aryllithium reagents. Subsequent exchange of the trimethylsilyl group via reaction of the vinylsilane with KF/n-Bu3SnCl/DMF stereospecifically afforded the corresponding (Z)-1,2-difluoro-2-substituted vinyl stannanes. Pd(PPh3)4/Cu(I)I/DMF coupling of the vinyl
Palladium/copper (I) halide catalyzed stereospecific couplings of 1,2-difluorovinylstannanes with aryl iodides and vinyl halides
作者:Long Lu、Donald J Burton
DOI:10.1016/s0040-4039(97)10002-8
日期:1997.11
Palladium/copper (I) halide catalyzedcrosscouplings of (E)- and (Z)-1,2-difluorovinylstannanes with aryl iodides and vinyl halides proceeded at room temperature to stereospecificallygive 1,2-disubstituted-1,2-difluoroolefins and 1,2-difluoro or 1,2,3,4-tetrafluorosubstituted dienes in good to excellent yields.
Copper(II) Mediated Homo-Coupling of 1,2-difluorovinylstannanes
作者:Eric J. Blumenthal、Donald J. Burton
DOI:10.1002/ijch.199900012
日期:——
reaction of substituted 1,2-difluorovinylstannanes with anhydrous Cu(OAc)2 in dimethylformamide, under an oxygen atmosphere, at room temperature stereospecifically gives the corresponding symmetrical 1,3-dienes in good to excellent yields. Moisture drastically reduces the yield of homo-coupled product and produces significant amounts of RCF=CFH. The Cu(II) promoted homo-coupling of the fluorinated vinylstannanes