The Hurd-Pollack mechanism for the para-Claisen rearrangement postulates a dienone intermediate. If the two groups ortho to the keto function are both of allylic nature either could migrate further to the para position. Rearrangement of y-phenylallyl2, 6-diallylphenyl ether gives a product in which 2, 6-diallyl-4-(y-phenylally1)-phenol was identified. However, identical treatment of allyl 2-allyl-6-(or-phenylallyl)-phenyl ether gives at least two ...
