Abstract
Treatment of cyclic carbonate of 3-alkene-1,2-diols or 4-methylcarbonate of 2-alkene-1,4-diols with a catalytic amount of Pd(PPh 3) 4 in aqueous THF or AcOH gave α,β-unsaturated aldehydes in good yields. The reaction can be interpreted by the regioselective 1,4-hydrogen migration of π-allylpalladium intermediate.
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