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Proanthocyanidin B6 : ウィキペディア英語版
Procyanidin B6

Procyanidin B6 is a B type proanthocyanidin.
Procyanidin B6 is a catechin-(4α→6)-catechin dimer. It can be found in grape seeds〔(Procyanidin dimers and trimers from grape seeds. Jorge M. Ricardo da Silva, Jacques Rigaud, Véronique Cheynier, Annie Cheminat and Michel Moutounet, 1991 )〕 and in beer.〔(Structure elucidation of proanthocyanidins: Direct synthesis and isolation from Pilsener beer. Jan Delcour, 1985 )〕
== Chemical synthesis ==
Molar equivalents of synthetic (2R,3S,4R or S)-leucocyanidin and (+)-catechin condense with exceptional rapidity at pH 5 under ambient conditions to give the all-trans-()- and ()-bi-() (procyanidins B3 and B6) the all-trans-()- and ()-tri-() (procyanidin C2 and isomer).〔Synthesis of condensed tannins. Part 9. The condensation sequence of leucocyanidin with (+)-catechin and with the resultant procyanidins. Jan. A. Delcour, Daneel Ferreira and David G. Roux, J. Chem. Soc., Perkin Trans. 1, 1983, pages 1711-1717, 〕

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