A new synthetic method for the preparation of high
molecular mass (the highest
;
10 200) condensed tannin has been developed.
Polymerization of 3′,4′,5,7-tetrabenzyloxyflavan
3,4-carbonate 2 and subsequent debenzylation gives a condensed
tannin having high molecular mass. Molecular mass of the
synthetic tannin increases up to a degree of polymerization
() of ∼35 with an
increase in the reaction time. This high molecular mass condensed
tannin, synthesized for the first time, is useful as a model
compound for natural condensed tannins with high molecular mass,
such as that from Japanese persimmon (Diospyros kaki L.)
fruit.
一种制备高分子质量(最高;10 200)缩合
单宁的新合成方法已经开发出来。 3′,4′,5,7-四苄基黄烷-3,4-
碳酸酯 2 的聚合和随后的脱苄基反应得到了高分子质量的缩合
单宁。随着反应时间的延长,合成
单宁的分子量会增加到聚合度()35。这种首次合成的高分子量缩合
单宁可作为高分子量天然缩合
单宁的模型化合物,例如从日本柿子(Diospyros kaki L.)果实中提取的
单宁。