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The stereoselective rearrangement of hexadienols (1) into cyclopropylacetaldehydes (2), R4 = H, or cyclopropylmethyl methyl ketones (2), R4 = CH3, takes place by “oxy-homodienyl hydrogen shift”. In the case of the corresponding hydrocarbons the equilibrium is on the side of the acyclic diene.
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Klärner et al. (1981) studied this question.
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