A protocol was established to control the 1,3-lithium shift in propargylic/allenylic
species formed by the conjugate addition of 4-aryl-3-butyn-1-enes with organolithiums.
Subsequent transmetalation and Pd(0)-catalyzed cross-coupling with aryl halides afforded
1,1-diarylallenes and 1,3-diarylallenes, respectively, the structural diversities
of which are determined by the easily availability of both 4-aryl-3-butyn-1-enes and
the organolithium reagents.
conjugated enynes - organolithiums - conjugate addition - Negishi coupling - allenes