Ethers, allylic, sigmatropic rearrangement from phenols

One reaction much used to produce the ortho relationship is the Claisen rearrangement.9 An allyl ether 36 from a phenol and an allylic halide 35 undergoes [3,3] sigmatropic rearrangement to give an intermediate 37 that is the keto form of a new phenol 38 with the allyl group now in the ortho position. 

The aromatic variation of the Claisen rearrangement is the [3,3] sigmatropic rearrangement of an allyl phenyl ether to an intermediate, which quickly tautomerizes to an ort/jo-substituted phenol. In this rearrangement, an allyl group migrates from a phenolic oxygen to a carbon atom ortho to it. 

A new site-selective dehydration can convert allylic alcohols (64) and (66) into the dienes (65) and (67) respectively, using 2,4-dinitrobenzenesulphenyl chloride in triethylamine. The intermediate selenenate ester presumably undergoes [2,3] sigmatropic rearrangement to the allyl selenoxide, which then fragments to the diene. Palladium diacetate-triphenylphosphine appears to be an effective catalyst for the elimination of acetic acid or phenol from allylic acetates or phenyl ethers respectively, leading to 1,3-dienes in high yield. ... 

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