Platinichlorides

Guvacoline, CjHjjOjN. K. Hess assigned this name to an alkaloid, obtained by E. Merck from areca nut, which yields a hydrobromide, short prisms, m.p. 144-5°, that he identified with guvacine methyl ester hydrobromide see above). The base is a colourless oil, b.p. 114°/13 mm., which yields a hydrochloride, m.p. 121-2°, a platinichloride, m.p. 211°, and on methylation furnishes a mixture of arecoline methiodide and hydriodide (p. 12). 

Arecoline, CgHj 302N. This, the most important alkaloid of areca nut, is an odourless, alkaline oil, b.p. 209°, volatile in steam, miseible with most organic solvents and water, but extractable from the latter by ether in presence of dissolved salts. The salts are crystalline, but usually deliquescent the hydrobromide, B. HBr, forms slender prisms, m.p. 177-9°, from hot alcohol the aurichloride, B. HAUCI4, is an oil, but the platinichloride, B2. H2PtClg, m.p. 176°, crystallises from water in orange-red rhombs. The methiodide forms glancing prisms, m.p. 173-4°. 

Platinichloride iaPtCl,. 2HaO Long, domatic prisms, m.p. 219° Bj. HjPtCI,. HjO Plates, m.p. 203°. 

Convolamine, Ci,H2304N. This alkaloid is hydrolysed by boiling alcoholic potash into tropine and veratric acid, and is, therefore, veratroyl-tropine. It has m.p. 114-5° and yields a picrate, m.p. 263-4° (dec.) aurichloride, m.p. 201-2° platinichloride, m.p. 216-7°, and methiodide, m.p. 273-5°. 

The isomeric -cinnamylcocaine (methylcinnamoyl-d- -ecgonine) prepared by Einhorn and Deckers by the action of cinnamoyl chloride at 150-60° on d-i/r-ecgonine methyl ester, crystallises in prisms, m.p. 68°, [ Id + 2° (EtOH). The hydrochloride, B. HCl, forms needles, m.p. 186° the platinichloride, needles, m.p. 208°, and the aurichloride orange needles, m.p. 164°. 

Mezcaline (Mescaline), CnHijOjN, is a colourless alkaline oil, b.p. 180-180-5°/12 mm., which absorbs carbon dioxide from the air, forming a crystalline carbonate. The sulphate, Bj.HjSO4.2HjO, m.p. 183-6°, forms brilliant prisms the hydrochloride, m.p. 181°, coloirrless crystals picrate, m.p. 216-8° and the platinichloride (B. HCl)j. PtCl4, m.p. 

Chelerythrine crystallises from alcohol in colourless, prismatic leaflets, m.p. 207°, containing one molecule of alcohol. The alkaloid absorbs carbon dioxide from the air, becoming yellow. The solutions fluoresce blue when the alkaloid is contaminated with its oxidation product, which is formed by mere exposure of solutions to air. The salts, which are quaternary, are intensely yellow. The hydrochloride, B. HCl. HjO, forms citron-yellow needles, and the sulphate, B. H2SO4.2HjO, golden-yellow needles, sparingly soluble in water the platinichloride, B2. HaPtCl. ... 

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