Selective cyclometalation of disubstituted acetylenes and ethylene with diethylmagnesium and ethylmagnesium halides in the presence of zirconium complexes
作者:R. M. Sultanov、V. V. Vasil’ev、U. M. Dzhemilev
DOI:10.1134/s1070428010030097
日期:2010.3
Catalytic cyclometalation of disubstituted acetylenes and ethylene with ethylmagnesium halides EtMgHlg (Hlg = Cl, Br) and diethylmagnesium Et2Mg in the presence of Cp2ZrCl2 gave tetrasubstituted magnesacyclopenta-2,4-dienes and disubstituted magnesacyclopent-2-enes. A probable scheme of formation of cyclic unsaturated organomagnesium compounds was proposed, according to which the reactive intermediates
Nickel(O)-mediated hydrocyanation and carbonylation reactions of alkynes with trimethylsilyl(iso)cyanide
作者:John J. Eisch、Allen A. Aradi、Kyoung I. Han
DOI:10.1016/s0040-4039(00)81847-x
日期:1983.1
Under nickel(0) mediation, trimethylsilyl(iso)cyanide serves as both as useful -hydrocyanating agent and a carbohylating agent for alkynes.
在镍(0)的介导下,三甲基甲硅烷基(异)氰化物既可用作有用的氢氰化剂,也可用作炔烃的碳氢化剂。
Bu2 iAlCl-Cp2TiCl2 ? A new reagent for hydroalumination of disubstituted acetylenes
作者:U. M. Dzhemilev、A. G. Ibragimov、I. R. Ramazanov、R. M. Sultanov、L. M. Khalilov、R. R. Muslukhov
DOI:10.1007/bf01431127
日期:1996.11
A new regio- and stereoselective method for the synthesis ofE-alkenylchloralanes based on Cp2TiCl2-catalyzed hydroalumination of disubstituted acetylenes by diisobutylaluminum chloride was developed. Hydrolysis and deuterolysis of organoaluminum compounds lead to the correspondingZ-olefins, and cross-coupling with ally) halides in the presence of Pd(Ph3P)4 results in the formation ofcis-4,5-disubstituted
Pair-Selective Coupling of Alkynes with Alkenes on Zirconocene Complex
作者:Tamotsu Takahashi、Zhenfeng Xi、Christophe J. Rousset、Noriyuki Suzuki
DOI:10.1246/cl.1993.1001
日期:1993.6
When ethylene and alkynes such as 4-octyne and diphenylacetylene were treated with Cp2ZrBu2 highly pair selective coupling products were formed in high yields. Similarly, styrene or trimethylvinylsilane also afforded cross coupling products with alkynes on zirconocene complex.
Tantalum-catalyzed reaction of disubstituted acetylenes with EtAlCl2
作者:R. N. Kadikova、I. R. Ramazanov、A. K. Amirova、O. S. Mozgovoj、U. M. Dzhemilev
DOI:10.1007/s11172-022-3640-x
日期:2022.10
Tetraalkyl-substituted (E, E)-buta-1,3-dienes were synthesized regio- and stereoselectively by the tantalum(V) chloride-catalyzed reaction of dialkyl-substituted acetylenes with EtAlCl2 and sodium metal in toluene followed by hydrolysis or deuterolysis. A mechanism of these transformations was suggested. The in situ generated organoaluminum intermediates reacted with methylsulfonyl chloride and iodine to give tetraalkyl-substituted (Z,Z)-1,4-dichlorobuta-1,3-dienes and 1,4-diiodobuta-1,3-dienes, respectively.