The polymeric procyanidin from the seed coat of sorghum grain has been isolated. Chemical studies show that it has a molecular weight in the region 1 700–2 000 and that it is derived biosynthetically from the condensation of the flavanol carbocation (5)(chain extender) and (+)-catechin (3)(chain inititor).
R. K. Gupta and E. Haslam, J. Chem. Soc., Perkin Trans. 1, 1978, 892 DOI: 10.1039/P19780000892
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