The Natural Organic Colouring Matters
By
Arthur George Perkin, F.R.S., F.R.S.E., F.I.C., professor of colour chemistry and dyeing in the University of Leeds
and
Arthur Ernest Everest, D.Sc., Ph.D., F.I.C., of the Wilton Research Laboratories; Late head of the Department of Coal-tar Colour Chemistry; Technical College, Huddersfield
Longmans, Green and Co.
39 Paternoster Row, London
Fourth Avenue & 30th Street, New York
Bombay, Calcutta, and Madras
1918
Kaikki kuvat (kemialliset kaavat) puuttuvat // None of the illustrations (of chemical formulas) included.
Eucalyptus macrorhyncha (F. v. M.), a fair-sized tree, is the "red stringy bark" of New South Wales, and the ordinary stringy bark tree of Victoria (Smith, Chem. Soc. Trans., 1898, 73, 697).
The leaves yield under favourable conditions a very large amount (10 per cent.) of a crystalline glucoside termed by Smith myrticolorin, which can be isolated in the crude condition by mere extraction with boiling water. The solution on cooling became semi-solid owing to the separation of crystals, and these can be purified by extraction with ether to remove chlorophyll and crystallisation first from alcohol and subsequently from water. It formed pale yellow needles, gave on hydrolysis quercetin and glucose, and at first appeared to be a new glucoside of quercetin. Though very similar to rutin its identity with this glucoside was unsuspected in that rutin by hydrolysis was presumed at that time to give quercetin and 2 molecules of rhamnose (Schunck, ibid., 1888, 53, 264). Schmidt in 1908 (Arch. Pharm., 246, 214), however, pointed out that rutin in this manner yields not only rhamnose but glucose, and the probability that myrticolorin as also viola quercitrin and osyritrin (loc. cit.} were identical with rutin was subsequently confirmed by Perkin (ibid., 1910, 97, 1776).
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