. Annual report on essential oils, synthetic perfumes, &c. Essences and essential oils; Perfumes. H2C C(OH)CHs (IV) Glycol from verbenene dibromide. HC CH-CH3 (V) Dihydroverbenene, C-CH3 (VI) a-Pinene. Pinene. — By repeated fractional distillation, in vacuo, of 15 litres of French turpentine oil, Pariselle1) obtained: — a-pinene, b. p. to ° (760 mm.), or 62° (32 mm.), d0o , [«]Di50 —43,48°, nD130 , rot. disp. 1 (A = 589), (A = 546), (/L = 492), 2 (/- = 436), coefficient of viscosity , mol. refr. , and ^-pinene, b. p. 163 to 164° (760
. Annual report on essential oils, synthetic perfumes, &c. Essences and essential oils; Perfumes. H2C C(OH)CHs (IV) Glycol from verbenene dibromide. HC CH-CH3 (V) Dihydroverbenene, C-CH3 (VI) a-Pinene. Pinene. — By repeated fractional distillation, in vacuo, of 15 litres of French turpentine oil, Pariselle1) obtained: — a-pinene, b. p. to ° (760 mm.), or 62° (32 mm.), d0o , [«]Di50 —43,48°, nD130 , rot. disp. 1 (A = 589), (A = 546), (/L = 492), 2 (/- = 436), coefficient of viscosity , mol. refr. , and ^-pinene, b. p. 163 to 164° (760 mm.), or ° (34 mm,), d0o , d15o , [a]D15Q — ° rot. disp. 1 (A = 589), (2 == 546), (I = 492), (?) {I = 436). With hydrogen bromide, a-pinene yielded the solid pinene hydrobromide, m. p. 94°, b. p. 94° (12 mm.), [a]D150 +° (in toluene solution), and a liquid hydrobromide which contained the solid isomeride in the dissolved state. ^-Pinene showed exactly the same behaviour and gave a solid monohydrobromide with nearly the identical physical constants, except [a]D150 being —°. By the action of bromine on a-pinene Pariselle obtained the solid monohydrobromide, a liquid monohydrobromide, a dibromide ( 150° with slight decomposition at 130°), and Wallach's dibromide ( 166 to 168°)3). By synthesising pinocamphone and a-pjnene from monocyclic bodies, L. Ruzicka and H. Trebler3) were able to prove the correctness of Wagner's pinene formula (1), ;) Compt. rend. 172 (1921), 1496. — 2) Cf. LieUg'8 Annalen 264 (1891), 7. — 3) Helv. chim. acta 4 (1921), Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Schimmel & Co. Miltitz bei Leipzig : Schimmel & Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksubject, booksubjectperfumes
