Constituents of the leaves of Helinus ovatus / by John Augustus Goodson.

  • Goodson, John Augustus.
Date:
1920.]
Catalogue details

Licence: Public Domain Mark

Credit: Constituents of the leaves of Helinus ovatus / by John Augustus Goodson. Source: Wellcome Collection.

    5/6 page 144
    When heated, the scyllitol obtained from II. ovatus leaves coloured slightly at 300°, darkened considerably at 320°, and melted and effervesced at 353°, as recorded by a mercury thermometer. J. Muller {Joe. cit.) gave the solubility of scyllitol in water as about 1 gram in 100 c.c. at 18°; the author finds a solubility of 1-03 grams in 100 grams at 18° for his specimen, whereas H. Muller Joe. cit.) gave it as 1‘7 grams in 100 c.c. at 15°. Its identity with scyllitol was confirmed by the preparation of the hexa-acetyl derivative, which melted at 291°. H. Muller Joe. cit.) gives 290—291° (corr.). (Found: C = 50*l; H = 5 6. Hexa-acetylscyllitol, C6H6(C2H30)60c requires C = 50’0; H = 5*6 per cent.) The filtrate from the lead precipitates, after removal of the lead, contained merely inorganic salts. In conclusion, the author desires to express his warmest thanks to Dr. Henry for his advice and criticism throughout the course of the work. Wellcome Chemical. Research Laboratories, London, E.C. 1. [Received, January \5th, 1920.]
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