摘要
本文通过丙酮淬熄和ESR跟踪方法对炔烃钛氢化反应进行了研究,对文献报道的机理提出了修正和补充。研究表明,在钛氢化物形成之前,首先生成Cp_2TiCl,随后再转变为Cp_2TiBr;顺、反式烯基格氏试剂在Cp_2TiH催化下,经加成-消除过程生成以反式为主的二苯乙烯。
The titano-hydrogenation reaction of ethynes was studied by quenching with acetone and tracked by ESR, and a hypothetic mechanism was suggested. The Cp2TiCl is first formed and then converted to Cp2-TiBr. Via additive-elimination of the cts- and trans-vinyl Grinard reagents, the trans-stilbene as the main product up to 90% is formed in the presence of [Cp2TiH].
基金
国家自然科学基金
