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Encyclopedia Britannica - Main :: BUN-CAL |
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CAFFEINE, or THEINE (1.3.7 trimethyl 2 . 6 dioxypurin) , C$ His N4 02 . H? O, a substance found in the leaves and beans of the coffee
Paraguay
cocoa
coffee
tannin
Bull . de la soc. chim. de Paris, 1876-1877, 27, p. 199). Synthetically it may be prepared by the methylation of silver theobromine and silver theophyllin or by boiling heteroxanthine with methyl iodide and potash. E. Fischer and L. Ach (Berichte, 1895, 28, p. 3135) have synthesized it from dimethyl alloxan, whilst W. Traube (Berichte, 1900, 33, p. 3435) has obtained it from 1 . 3 diamethyl 4. 5 diamino 2.6 dioxypyrimidine. On the constitution of caffeine see BURIN and also E. Fischer (Annalen, 1882, 215, p. 253).Caffeine crystallizes in long silky needles, which are slightly soluble in cold water. It becomes anhydrous at ro0 C. and melts at 234 to 23 5 C. It has a faint bitter
taste and gives salts with mineral
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