Characterization of Vinyl-Substituted, Carbon−Carbon Double Bonds by GC/FT-IR Analysis
作者:Aleš Svatoš、Athula B. Attygalle
DOI:10.1021/ac960890u
日期:1997.5.1
of carbon-carbon double bonds conjugated with a vinyl group. Cis and transisomers of unsubstituted 1,3-alkadienes can be differentiated on the basis of the differences observed in the 900-1000 cm-1 region (spectra of cisisomers show two bands at 993 and 906 cm-1, while those of trans compounds show three absorptions at 998, 949, and 902 cm-1) and the 1590-1650 cm-1 region (the C=C stretch bands are
The cross-coupling reactions of 2-(1,3-butadienyl)magnesium chloride (1) with aryl and alkyl iodides were investigated in the presence of transition metal catalysts. Tetrakis(triphenylphosphine)pal...
A Four-Carbon Unit Reagent for the Regiospecific Synthesis of 2-Alkyl-Substituted 1,3-Butadienes
作者:Alan R. Katritzky、Larisa Serdyuk、Dorin Toader、Xiaojing Wang
DOI:10.1021/jo9818881
日期:1999.3.1
2-Alkyl-substituted butadienes are synthesized starting from a masked butadiene reagent, which allows the regiospecific synthesis of 2-alkylbutadienes by lithiation and subsequent reaction with alkyl halides or aliphatic aldehydes. The regioselectivity of the reaction with allylichalides and aliphatic and aromatic aldehydes is studied.
Dimethylphenylsilyl group is removed from a vinyl carbon with tetrabutylammonium fluoride. The presence of phenyl group on silicon atom plays a critical role. The cleavage of allyldimethylsilyl- and alkoxydimethylsilyl groups also proceeds very easily.
Carbon–Carbon Bond Formation by Cross Coupling of Enol Phosphates or Enol Triflates with Organomanganese Compounds
作者:Keigo Fugami、Koichiro Oshima、Kiitiro Utimoto
DOI:10.1246/cl.1987.2203
日期:1987.11.5
Trialkylmanganese-mediated alkylation of enol phosphates is performed in the presence of a catalytic amount of Pd(PPh3)4. The cross coupling reaction catalyzed by Li2MnCl4 between enol triflates and Grignard reagents is also described.