A combined reagent derived from Ti(O-n-Bu)(4) and KO-t-Bu (1:1) has proved
to be very effective for the self-aldol addition and also for the cross-ald
ol condensation between aldehyde and alpha,beta-unsaturated aldehyde such a
s 2-alkenal or 2-alkynal. (C) 2000 Elsevier Science Ltd. All rights reserve
d.