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A conjugated dienic benzyl ether was shown to undergo Wittig sigmatropic rearrangementto give a mixture of[1,2]and[1,4]besides the expected[2,3]rearrangement product.The solventeffect as well as the reaction pathways were discussed.
A conjugated dienic benzyl ether was shown to under Wittig sigmatropic rearrangement to give a mixture of [1,2] and [1,4] besides the expected [2,3] rearrangement product. The solventeffect as well as the reaction pathways were discussed.