STUDIES ON REACTIONS OF 6,6-DIALKYLFULVEN ES WITH GRIGNARD-REAGENTS

Exocyclic double bond addition and reduction took place when 6,6-dialk ylfulvenes reacted with allylmagnesium halide and cyclopentadienylmagn esium bromide, respectively. Some titanium compounds Cp (C5H4) CRR(1)- CH2CH = CH2)TiCl2 and (C(5)H(4)CHRR(1))(2)TiCl2 have been prepared by the complexation of substituted cyclopentadienyl anions obtained from the above reactions with (CpTiCl(2))(2)O or TiCl4. However, no reactio n was observed when 6,6-dialkylfulvenes were treated with ethylmagnesi um bromide, n-butylmagnesium bromide, phenylmagnesium bromide, benzylm agnesium chloride, cyclopentadienyllithium and cyclopentadienylsodium, separately. Reaction mechanism of fulvenes with allylmagnesium halide s and cyclopentadienylmagnesium bromide is discussed.