Procyanidin B6 is a

B type proanthocyanidin B type proanthocyanidins are a specific type of proanthocyanidin, which are a class of flavanoids. They are oligomers of flavan-3-ols. Dimeric B type proanthocyanidins These molecules have the molecular formula C30H26O12 (molar mass : 578.52 g/m ...

. Procyanidin B6 is a

catechin Catechin is a flavan-3-ol, a type of secondary metabolite providing antioxidant roles in plants. It belongs to the subgroup of polyphenols called flavonoids. The name of the catechin chemical family derives from ''catechu'', which is the tannic ...

-(4α→6)-catechin dimer. It can be found in grape seeds 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 (+)-

condense with exceptional rapidity at pH 5 under ambient conditions to give the all-trans- ,8 and ,6bi- +)-catechins( procyanidins B3 and B6) the all-trans- ,8:4,8 and ,8:4,6tri- +)-catechins(

procyanidin C2 Procyanidin C2 is a B type proanthocyanidin trimer (chemistry), trimer, a type of condensed tannin. Natural occurrences Procyanidin C2 is found in grape seeds (''Vitis vinifera'') and wine, in barley (''Hordeum vulgare''), malt and beer, in ''Be ...

and isomer).

References

{{procyanidin Procyanidin dimers