Preparation of syn-Tertiary Homoallylic Alcohols Utilizing Allenyltitanocenes Generated by Reductive Titanation of γ-Trimethylsilylpropargylic Carbonates

syn-Tertiary homoallylic alcohols were obtained by the reaction of α-silylallenyltitanocenes generated by the reductive titanation of γ-silylpropargylic carbonates with Cp₂Ti[P(OEt)₃]₂ with ketones and following desilylation and partial hydrogenation. High diastereoselectivity was observed when aromatic and α,β-unsaturated ketones were employed.