Titanium-catalyzed Diels-Alder cycloaddition of conjugated dienes to bis(trimethylsilyl)acetylene. 1,2-bis(trimethylsilyl)cyclohexa-1,4-diene, 1,2-bis(trimethylsilyl)benzene, and their methyl derivatives
作者:K. Mach、H. Antropiusová、L. Petrusová、F. Tureček、V. Hanuš、P. Sedmera、J. Schraml
DOI:10.1016/0022-328x(85)87410-6
日期:1985.7
The catalytic system Et2AlCl/TiCl4 induces Diels-Alder cycloaddition of bis(trimethylsilyl)acetylene to 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene and (E)-1,3-pentadiene affording 1,2-bis(trimethylsuyl)cyclohexa-1,4-dienes in high yields. The cyclohexadienes are readily converted to the corresponding 1,2-bis(trimethylsilyl)benzenes upon heating to 240°C. Mass, infrared, 1H, 13C and 29Si NMR
催化体系Et 2 AlCl / TiCl 4诱导双(三甲基甲硅烷基)乙炔的Diels-Alder环加成反应成1,3-丁二烯,异戊二烯,2,3-二甲基-1,3-丁二烯和(E)-1,3-戊二烯以高收率得到1,2-双(三甲基磺酰基)环己-1,4-二烯。在加热至240℃时,环己二烯易于转化为相应的1,2-双(三甲基甲硅烷基)苯。报告并简要讨论了所有所得产物的质谱,红外,1 H,13 C和29 Si NMR光谱。芳香族化合物的拥挤特征反映在其质量,13 C和29 Si NMR光谱中。