Wislicenus (L. A. 167, 332) obtained the following results: Solutions 1 and 2 were supersaturated. Para-lactate of lime, Ca (C, H; O3)2 + 9 H, O. Lævo-rotatory. Hydrated salt. C = 7.23. 5 [a]D = 5.25 to 95 § 115. Vegetable Acids. Dextro-tartaric acid, C4 H O. See § 19, p. 47, Arndtsen. per cent. The formulæ apply for q = 50 See also § 26, p. 60, Krecke (For Influence of Temperature). The specific rotation of tartaric acid is considerably diminished by the presence of other acids. Biot (Mém. de l'Acad. 16, 229). Dextro-tartrates. Solutions in water. The following determinations (Landolt) are for the anhydrous salts. Temperature always at 20°. -2 6 For sodium tartrate, Na, C1 H2O + 2 H2 O, Hesse (L. A.176, 122) found:-Water, c = 5 to 15, t = 15. [a] = 27.85 0.17 c. Krecke (Arch. Néerl. VII., 1872) has determined the specific rotation of a few tartrates. At temperatures between 0° and 100°, and for various rays, with concentration c = 20, and the temperature =25°, he obtained the following results : K. Na. C1 H4 06 + 4 H2 O 2 (K. SbO. C1 H106) + H2O (c = 5) 111-82 138-66 180.39 187.39 218.74 4 Increase of temperature had little or no effect on the three firstmentioned salts; Rochelle salt showed increase of specific rotation, but tartar emetic decrease. Tartrate of ethyl, (C2 H5)2 . C4 H4 06. See § 33, p. 77. Lævo-tartaric acid. Pasteur (A. C. P. [3] 24, 442; 28, 56; 38, 437) gives the following data, which in part apply to Biot's red ray (see § 18, p. 43. = = ― Free acid, p= 35-7. t 17. [a], 8:43. (Dextro-rotatory tartaric acid under like conditions gives [a], = + 8.53. Biot.) Lævo-tartrate of ammonia, [a], 29.3. (The dextro-rotatory salt gives [a]r = + 29'0.) = Lævo-tartrate of sodium and ammonium, Na. NH4. C4 H4 О6 + 4H2O. [a]; (The dextro-rotatory salt gives [a]; = + 26·0.) = - 26.0. Lævo-rotatory tartar emetic, [a];: salt gives [a] = + 156.2.) = 156.2. (Dextro-rotatory Lævo-tartrate of lime dissolved in hydrochloric acid (20 grammes tartrate for 63 cubic centimetres of acid, of specific gravity 1:08) gives a decidedly dextro-rotatory solution. In presence of boracic acid, lævo-tartaric acid behaves exactly as does the dextro-rotatory acid. Biot (A. C. P. [3] 28, 99). Malic acid, C4 H 05. Lævo-rotatory. From mountain-ash berries. A slight lævo-rotation increased by dilution with water as well as by increase of temperature. The specific rotation is increased considerably by the addition of boracic acid. On the other hand, mineral as well as organic acids diminish it, and may even convert it into dextro-rotation. Hydrochloric acid of 9.5° Baumé. p = 12·474. t = 22. [a]; = + 10.88 Water 466). = + 115.47 Pasteur (A. C. P. [3] 31, 85). Amides of malic and tartaric acids. Pasteur, (A. C. P. [3] 38, Aspartic acid, C, H, NO4. Dextro-rotatory in acid solutions; C4 Pasteur [a]; = 2.22 p = 4.02. [a]; Soda solution containing 4.84 per cent. Na, O. p = 9.99. (a) Ritthausen's preparation from legumin (Journ. für prakt. Chem. [1] 107, 227). (b) Pasteur's preparation from asparagin (A. C. P. [3] 31, 78). Asparagin, CH, N2 Og. Dextro-rotatory in acid solutions; lævo-rotatory in alkaline. Nitric acid of specific gravity 1.1102 at 22°. t = 22. [a]; + 35.09. Hydrochloric acid. 1.0706 at 23°. = 11.125. t = ? [a]; == + 34.40. Pasteur (A. C. P. [3] 31, 75). = Water and 10 grammes N H, in 100 cub. cent. solution p = 1.66. [a]D = p = 12.72 t = 18. [a], = 11.18. 6.23. § 116. Terpenes, C10 H16 I. Dextro-rotatory Oil of Turpentine, Australene. [The latter name is applied to the preparation obtained by distillation after neutralization by soda solution.] (a) From Pinus australis and P. Taeda. American or so-called English oil of turpentine. a; [a], [a]D 13.5 (crude); 14.6 (rectified). Luboldt. = 18.6. Guibourt and Bouchardat. = 14.15 at 20°. d = 0.9108. Landolt (§ 31, p. 70). Wiedemann (Pogg. Ann. 82, 222) obtained the following angles of rotation for different rays: [a]; Australene. Distilled at 100° with reduced pressure. Portion I. Berthelot (A. C. P. [3] 40, 5). (Boiling-point, 161°.) (b) From Pinus sylvestris and P. Abies. Russian or so-called German oil of turpentine. [a]; = 14.6 to 16.3. Luboldt. Australene from Pinus sylvestris, [a]D = 32·4. [a]; = 40.3 with t = 24.5°, (ap = 27·7, d= 0.8547. Boiling-point, 1555 to 156.5). Flawitzky (D. C. G. 1878, 1846). Australene from Swedish wood-tar of Finus sylvestris, [a]D = 36.3 (d = 0.8631 at 16°. Boiling-point, 1565 to 157-5.) Atterberg (D. C. G. 1877, 1203). II. Lævo-rotatory turpentine oil. Terebenthene. (Neutralized and distilled.) tine. (a) From Pinus Pinaster (P. maritima). French oil of turpen = = Commercial oils, a; 18.2, Luboldt; a 31-1, Gladstone; a 35.4 to 36.5, Berthelot; 35.6, Gladstone; 36.5, Gernez; 40·0, Biot; 42.2, Mayer; 43.0, Deville; 43.4, Soubeiran and Capitaine; 45·5, Buignet. For different rays, Wiedemann (A. P. 82, 222) found: D Lines α = B 21.5 C Terebenthene. [a]; = 42.3. G 55.9 (Distilled with reduced pressure, at temperatures between 80° and 100°. Boiling-point, 161°.) Berthelot [a] = - 37.01 at 20° (d = 0.8629 at 20°. Landolt (§ 30, p. 66). [a]D = (A. C. P. [3] 40, 5). Boiling-point, 161°). 40.30 (d = 0·8685 at 10°. Boiling-point, 156°). Riban (A. C. P. [5] 6, 15). Iso-terebenthene. Obtained by exposing terebenthene for two hours to a temperature of 300°. [a]D=945 (d = 0.8431 at 20°. Boiling-point, 175°). Riban (A. P. C. [5] 6, 218). [a]; (b) From P. Larix. Venetian oil of turpentine. (c) Templin oil. "Krummholz" oil. 1. From the cones of Pinus picea. Crude : [a]; = 92.5. [a]; = -85.2. [a], = 98.8. Rectified: 107.6. Flückiger, Berthelot (J. B. 1855, 643). 2. From young shoots of Pinus pumilio.1 [a]; = 8.2. Jolly, Buchner (L. A. 116, 328). By exposure to the air, turpentine oils experience a decrease of rotatory power by oxidation (§ 30), whence probably these discrepancies in the data. When distilled, the unaltered and more highly rotatory portions are carried over first. For the alterations of the rotatory power of oil of turpentine at temperatures above boiling-point, see § 16, p. 35. For information on the rotatory properties of the numerous derivatives of oil of turpentine, as they have been investigated by Deville (A. C. P. [2] 75, 37) and Berthelot (A. C. P. [3] 38, 38; 39, 10; 40, 5), reference must be made to the original memoirs. In the case of most of the solid substances examined the concentrations of 1 Pinus pumilio is the dwarf pine (Krummholz), a species with recumbent stem found in the Alps and Pyrenees.--D.C.R. |