Bulletin Volume 109-127 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ...in an alcoholic solution gave the specific rotation oD=-88.02 from the values: a=-1.36 p = 1.90 l= (7 = 0.8132 For further confirmation of the presence of abietic acid, the silver salts were analyzed, with tho following results: Per cent. 0. 3203 gram silver salt gave 0.0834 gram silver =26.04. 0600 gram silver Bait gave.0159 gram silver =26.50. 1022 gram silver salt gave.0504 gram silver =26.22 Silver abietate, Ag (CIIO, requires 26.37 per cent silver. It will be noted that tliis abietic acid is strongly Z-rotatory, and it is probable that the lower rotations of other authors is due to a mixture of d-and I-acids. For the specific rotation of abietic acid Dieterich 1 gives-48; Haller, 2-53; Mach, 3-69.96; Mead and Kremers, 4--53.42; Leskiewicz 5 (for Z-sylvic acid), --102.85. Caillot8 observed, however, that the optical rotation decreased with 1 Dissertation, Berne, 1883. 'Proc. Am. Pharm. Ass'n. p. 198, vol. 41,1893. - Berichte, p. 2167, vol. 18,1885. s Jour. f. prak. Chem., p. 416, vol. 189,1910. 'Monatsh. f. Chemie, p. 641, vol. 14, 1894. Bull. Soc. Chim., p. 387, vol. 21,1874. 58237--Bull. 119--13 3 the degree of heating and with the concentration of the solution. Acids isolated from the oleoresin of Pinus sabiniana and not heated above 60 gave--95.82 for the specific rotation, which approaches the rotation of the Z-sylvic acid for which Leskiewicz found aB =-102.85. CONCLUSIONS. From the distillation data it has been estimated that the volatile oil of Pinus ponderosa scopulorum contains 60 to 70 per cent d-apinene, about 5 per cent /3-pinene, and 20 to 25 per cent limonene. The rosin contains about 90 per cent abietic acid. Pinus Sabiniana Dougl. LITERATURE.1 The volatile oil obtained from the resinous exudation of the digger pine (Pinus sabiniana)...