Abstract
The reaction of allenes with active methynes and methylenes proceeded smoothly in the presence of Pd(PPh3)4/PhCOOH combined catalyst to give the corresponding monoallylated products with E-stereoselectivity in good to high yields. This result is in marked contrast to the previous finding that the reaction of allenes with active methynes, in the presence of Pd2(dba)3·CHCl3/dppb catalyst, affords the allylation products in lower yield with lower stereoselectivities.
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