LMo(CO)_5-TiCl_4催化体系对己烯的环化作用

CYCLIZATION OF HEXENE OVER LMo(CO)_5-TiCl_4 CATALYST SYSTEM

烯烃歧化反应是近年来发现的最引人注目的催化反应之一。我们曾采用Doyle报导的Bu_4NMo(CO)_5Cl-RAlCl_2催化体系由1-十六烯歧化制备15-三十烯。W(CO)_6-TiCl_4是一个光歧化催化体系。我们曾试图用过渡金属氯化物如TiCl_4、ZrCl_4。

Cyclization of 1-hexene in the presence of LMo(CO)_5-TiCl_4 forms methylcyclopentane.A parallel relationship was found among the yield of cyclization and the isomerizationof 1-hexene and the amount of tetrahlorotitanium added. When L = PPh_3, the catalyst sy-stem showed the highest cyclization activity.