The Plant Alkaloids
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P. 268-269, [a]^ + 204-5 in alcohol (Hesse), + 190 at 14 (Rabe), less soluble in chloroform or alcohol (1 in 22 T 5) than cinchonine. The base is diacidic and forms two series of salts ; the neutral sulphate, B 2 . H 2 S0 4 . 11H 2 0, forms fine needles, m. P. 194'8-195 (dry), soluble in water (1 in 37'6 at 12). The hydrochloride, B. HC1. 2H 2 0, m. P. 216. 5, occurs in small needles, and the platinichloride, B 2 . 2HCl. PtCl 4, in orange-red needles sparingly soluble in water.
Hydrocinchonidin...e (Cinchamidine), C 19 H 24 ON 2 . This alkaloid was isolated by Forst and Bohringer 4 from the bark of Cinchona Ledgeriana, but has since been observed accompanying homo- cinchonidine (p. 151) in many varieties of cinchona, and espe- cially C. Rosulenta and C. Lancifolia. It is best prepared from commercial cinchonidine sulphate by fractional precipitation with sodium tartrate, the hydrocinchonidine tartrate occurring in the last fractions ; these are treated with potassium permanganate solution, which rapidly destroys cinchonidine, but only slowly attacks the hydro-base ; the latter can then be regenerated by addition of excess of ammonia.
What to read after The Plant Alkaloids?
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To quickly assess the difficulty of the text, read a short excerpt:
P. 268-269, [a]^ + 204-5 in alcohol (Hesse), + 190 at 14 (Rabe), less soluble in chloroform or alcohol (1 in 22 T 5) than cinchonine. The base is diacidic and forms two series of salts ; the neutral sulphate, B 2 . H 2 S0 4 . 11H 2 0, forms fine needles, m. P. 194'8-195 (dry), soluble in water (1 in 37'6 at 12). The hydrochloride, B. HC1. 2H 2 0, m. P. 216. 5, occurs in small needles, and the platinichloride, B 2 . 2HCl. PtCl 4, in orange-red needles sparingly soluble in water.
Hydrocinchonidin...e (Cinchamidine), C 19 H 24 ON 2 . This alkaloid was isolated by Forst and Bohringer 4 from the bark of Cinchona Ledgeriana, but has since been observed accompanying homo- cinchonidine (p. 151) in many varieties of cinchona, and espe- cially C. Rosulenta and C. Lancifolia. It is best prepared from commercial cinchonidine sulphate by fractional precipitation with sodium tartrate, the hydrocinchonidine tartrate occurring in the last fractions ; these are treated with potassium permanganate solution, which rapidly destroys cinchonidine, but only slowly attacks the hydro-base ; the latter can then be regenerated by addition of excess of ammonia.
What to read after The Plant Alkaloids?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Anderson Henry to read onlineMoreLess
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