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.