Abstract
Flavonoid was found to be widely distributed in the leaves of conifers, and dried leaves of Torreya nucifera SIEB. et ZUCC. (Taxaceae) were treated with methanol, from which a new flavone was obtained. This was named kayaflavone. This substance forms slightly yellow microneedles, m.p. 314-315° (decomp.), and its molecular formula was assumed to be C33H21O10, from the presence of 3 each of hydroxyl and methoxyl groups. Its methanolic solution gives orange-red coloration to magnesium and hydrochloric acid, reddish violet coloration to zinc and hydrochloric acid, and greenish brown to ferric chloride solution. From the agreement of its various derivatives, this flavone was found to be a monomethyl ether of ginkgetin, obtained from the leaves of Ginkgo biloba L. (Ginkgoaceae).
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