反应详情

47.5 millimoles of butyllithium mixed with a C6 alkane are added slowly to 47.5 millimoles of the γ-butenylcyclopentadiene prepared in the preceding stage (b), in 50 ml of THF at 0° C. and are stirred for 1 hours. The γ-butenylcyclopentadienyllithium solution thus produced is added to 19 millimoles of hafnium tetrachloride in 50 ml of THF at 0° C. and is stirred for 65 hours. The volatile compounds are removed under vacuum and the residue is extracted with ether and filtered. The product is precipitated in the form of a white solid by slowly cooling the solution to −50° C. and recrystallizing from ether at −12° C.