The invention relates to a process for the preparation of a compound of the formula IV or IVa ##STR1## in which R.sup.1 -R.sup.5 are preferably hydrogen or alkyl, which comprises reacting a compound I ##STR2## with a compound II ##STR3## in which X.sup.1 and X.sup.2 are preferably halogen, to give the corresponding indanones, which are converted into the compounds IV and IVa by reduction and dehydration. The compounds IV and IVa are important intermediate products for the preparation of chiral metallocene complexes which are suitable catalyst components for olefin polymerization.
本发明涉及一种制备公式IV或IVa化合物的方法,其中R.sup.1-R.sup.5优选为氢或烷基,包括将化合物I与化合物II反应,其中X.sup.1和X.sup.2优选为卤素,得到相应的
茚酮,通过还原和脱
水反应将其转化为化合物IV和IVa。化合物IV和IVa是制备手性
金属茂配合物的重要中间体,这些配合物是适用于烯烃聚合的催化剂组分。