A research on the pines of Australia / by Richard T. Baker and Henry G. Smith.

  • Baker, Richard Thomas, 1854-1941.
Date:
1910
Catalogue details

Licence: In copyright

Credit: A research on the pines of Australia / by Richard T. Baker and Henry G. Smith. Source: Wellcome Collection.

    170/538 page 130
    refractive index at i8° C. = 1-4744. The freshly-distilled oil was soluble in one volume go per cent, alcohol. The saponification number was 35-7, equal to 12-49 per cents, of ester as bornyl- and geranyl-acetates. The oil obtained from the general material was taken for the full investiga- tion. It had specific gravity at 180 C. = 0-8729 ; rotation ^ = + 27-9°; refrac- tive index at 180 C. = 1-4747. The freshly distilled oil was scarcely soluble in ten volumes of 80 per cent, alcohol, but was not rendered turbid by excess; it was readily soluble in one volume 90 per cent, alcohol, but rapidly became less soluble on keeping. The saponification number was 47-03, equal to 16-46 per cent, of ester. In the cold with alcoholic potash, and with three hours contact, the saponification number was 24-5, equal to 8-57 per cent, of ester. On redistilling, practically nothing came over below 156° C.; between 156° and 160,0 30 per cent, distilled; between 160° and 1750 C., 45 per cent.; between 1750 and 200° C., 8 per cent.; between 200° and 230° C., 12 per cent. The specific gravity of the first fraction at 'f |0 C. = 0-8562; of the second, 0-8571; of the third, 0-8689; °f the fourth, 0-9415. The rotation of the first fraction aD = + 30-4; of the second, + 27-2° ; of the third, + 21-0°; of the fourth, + 32-4. The fourth fraction contained 68-2 per cent, of ester. Both borneol and acetic acid were isolated and determined; so that the high activity is largely due to the presence of dextro-rotatory bornyl-acetate, and to dextro-rotatory borneol also. The refractive index at 2i°C. of the first fraction = 1-4733; of the second, 1-4736; of the third, 1-4744; of the fourth, 1-4723. Ter penes.—The first and second fractions were mixed together and redis- tilled. Between 156° and 160° C. 42 per cent, distilled, and 29 per cent, between 1600 and 1610 C. The specific gravity of both fractions at 20° C. = 0-8549; the rotation of first fraction aD = +30-8°, or a specific rotation [a]D + 36-02° and the refractive index at 20° G. = 1-4733. The nitrosochloride was easily prepared from this fraction, and was finally purified from chloroform by precipitating with methyl alcohol. The nitrosopinene was prepared from this, and when finally purified from acetic ether it formed good crystals which melted at 1320 C. The low boiling terpene in the leaf oil of this species is, therefore, dextro-rotatory pinene. The second fraction also consisted largely of this pinene. The third fraction (i75°-200° C.) consisted largely of dextro-rotatory limonene together with dipentene. The presence of these terpenes in the leaf oil of this species was completely proved in the oil obtained from the material from Boppy Mountain, No. 2. Alcohols.—That portion of the oil distilling between 200°-230° C. was taken for the determination of the alcohols and the acids of the esters. 1-091 gram of oil reg. 0-2128 gram potash, S.N. - 195-05, equal to 68-26 per cent, ester. The remaind ;i was saponified by boiling in aqueous potash, and the oily portion ibis oil hacT'a marked odour of borneol. Sufficient borneol was
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