A.H. Williams

TL;DR: It is shown that there is a basic pattern of phenolic constituents common to most of these plants and that calleryanin, its phenolic acid esters and the 4-glucoside of protocatechuic acid were found to be restricted to P. calleryana.

TL;DR: In this article, a leaf phenolic analysis of Pyrus calleryana Dcne. has revealed that this species is a highly individual member of the genus Pyrus, and that the compounds present in the leaf of P. communis L are arbutin, quercetin 3-glycosides, chlorogenic and isochlorogenic acids in considerably reduced amounts.

TL;DR: The structure of calleryanin (3,4-dihydroxybenzyl alcohol 4-O-β- d -monoglucopyranoside) has been confirmed by 1H and 13C NMR analysis and the structure of its benzylic esters with caffeic, protocatechuic and 4-hydroxybenzoic acids verified by catalytical hydrogenolysis.

TL;DR: In this article, the transformation of monophenolic compounds to their ortho-dihydroxy analogues by the action of phenolase has been studied for enzyme sources from Malus, Pyrus and a few other plants.

TL;DR: Isosalipurposide, the 2′-glucoside of chalconaringenin, has been shown to be the principal flavonoid of young bark of Salix purpurea ; in the old bark it is accompanied by isomeric forms of naredenin 5-glocoside, salipurpositionide as mentioned in this paper.