The kinetic effect of substituents at C(3) of βγ-unsaturated acids is consistent with the development of a partial positive charge at that position during decarboxylation. The OMe group increases the rate of decarboxylation as much as 105–106 fold.
A. Al-Borno and D. B. Bigley, J. Chem. Soc., Perkin Trans. 2, 1982, 15 DOI: 10.1039/P29820000015
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