When vic‐dihydroxychlorins undergo a pinacol‐pinacolone rearrangement, the migratory aptitudes of common porphyrin substituents follow the order: alkyl groups, propionate side chain, H > methyl group > acetate side chain. C‐Alkylchlorins can be made by extremely short syntheses utilizing such rearrangement.
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Chang et al. (1985) studied this question.
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