Titanium-catalyzed cycloaddition reactions of phenyl(trimethylsilyl)acetylene to conjugated dienes and 1,3,5-cycloheptatriene. 1-Phenyl-2-(trimethylsilyl)-cyclohexa-1,4-dienes and their aromatization
作者:René Klein、Petr Sedmera、Jiří Čejka、Karel Mach
DOI:10.1016/0022-328x(92)85042-u
日期:1992.9
The catalytic system Et2AlCl/TiCl4 induces Diels-Alder addition of phenyl(trimethylsilyl)acetylene (PTMSA) to 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 2-methyl-1,3-pentadiene, and [6+21 addition of PTMSA to 1,3,5-cycloheptatriene. The 1-phenyl-2-(trimethylsilyl)-cyclohexa-1,4-dienes obtained undergo thermolysis, yielding the corresponding ortho-(trimethylsilyl)biphenyl derivatives. The
催化体系Et 2 AlCl / TiCl 4诱导Diels-Alder向1,3-丁二烯,异戊二烯,2,3-二甲基-1,3-丁二烯,2-甲基-1, 3-戊二烯和[6 + 21] PTMSA加到1,3,5-环庚三烯中。将获得的1-苯基-2-(三甲基甲硅烷基)-环己-1,4-二烯进行热分解,得到相应的邻-(三甲基甲硅烷基)联苯衍生物。含有邻位甲基和三甲基甲硅烷基的环己二烯在300°C时会释放出甲烷(释放了3-甲基)。所有其他衍生物仅在260°C释放氢。