The two basic structural units of condensed prodelphinidin polymers have been defined by generation of the C-4 carbocations, corresponding in stereochemistry to (+)-gallocatechin (1) and (–)-epigallocatechin (2), and trapping them as their phloroglucinol adducts (4) and (7). Two naturally occurring dimeric prodelphinidins with stereochemistry based on that of gallocatechin have also been isolated.
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Foo et al. (1978) studied this question.