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C: Total phenol concentration (ppm). D: degree of dilution (10). V: volume of starting solution (30 ml). M0: mass of dry sawdust (mg). Determination of proanthocyanidin content Anthocyans measurement by the acid hydrolysis in butanol method 5 ml of ferrous sulfate solution obtained by...
This unexpected result prompted us to verify another route based on the on the use of the N-benzylpyperidine 17 that was obtained by esterification with phenol of the parent acid (Scheme 5). We were pleased to find that the1,3-dicarbonyl intermediate 5a, formed by reaction of the enolate...