K. Sato et al., Preparation and reactions of monocyclic bis(cyclopentadienyl)titanacyclopentenes and -pentadienes, J ORGMET CH, 633(1-2), 2001, pp. 18-26
A combination of CP2TiCl2-2EtMgBr was found to be very effective for the fo
rmation of monocyclic titanacyclopentenes in excellent yields. On the other
hand, a combination of Cp2TiCl2-2n-BuLi was used for intermolecular coupli
ng of two alkynes to form titanacyclopentadienes in good to excellent yield
s. A reaction temperature range from -10 to -30 degreesC was critical for t
he success of the combinations. Reactions of these in situ-prepared titanac
ycles show interesting similarities to or differences from their zirconacyc
le analogs. (C) 2001 Published by Elsevier Science BN.