XLVIII.—Robinin, violaquercetin, myrticolorin, and osyritrin

Arthur George Perkin
1902 Journal of the Chemical Society Transactions  
IN a previous communication (Trans., 1900, 77, 430), it was shown that the leaves of Robinia Psezcdacacia contain acacetin, a monomethyl ether of apigenin, an interesting point in view of the discovery by Zwenger and Dronke (Annalen Xuppl., 1861,1,263) that the flowers of the same plant contain a quercetin glucoside, robinin. AS these flowers, however, are practically devoid of dyeing properties, it seemed doubtful whether a quercetin compound was present, and reference to the work of these
more » ... e work of these chemists made i b probable this suspicion was well founded. At the time of Zwenger and Dronke's investigation, the obstinacy with which these colouring matters retain water of crystallisation was not fully appreciated, and results accurate in themselves frequently received a wrong interpretation. The analyses of their " quercetin " were made with material dried at looo, a temperature at which it is rarely rendered anhydrous; again, it was unlikely that picric acid mould result from the action of nitric acid on quercetin.
doi:10.1039/ct9028100473 fatcat:kdniz5z26rf67ab4ucwqvxpwia