Nucleophilic reactions of propargyl acetates mediated by titanocene dichloride and magnesium

Reaction of Cp2TiCl2/Mg with propargyl acetates form allenyl titanium intermediates, which undergo nucleophilic addition reactions to aldehydes or ketones to give homopropargyl alcohols in high yields. Subsequent nucleophilic addition to acetonitrile and nucleophilic substitution with allyl bromide are also mentioned.