A treatise on chemistry by unknow

Author:unknow
Language: eng
Format: epub
Tags: Chemistry
Publisher: London, Macmillan and co., limited
Published: 1920-03-25T05:00:00+00:00

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mportant pirt»^ whSst in the eaae of tea tlie ha^ quimlily ftdd wliich it contains modifiat llie admi of tbd

oflee and t», Bod probably olbcr diel^cs vrhich coiitiiiQ ioe^ Btirwql^t^ nervous action atul iliminish metaboliam, for tills reason tbe desire for ste^p and nourishment aft«r of sach bereiagea beoomes leas, Thia fiict appears live been long known to the Arabs, who accordingly uao in their feasts and nocturnal i^Ugions ceremonies* Thia MC word for coffee-bean is Bcmnne, but the be?orage la led Kahtca^ derived from Ikha, signifying distaste (for food

i By the action of concentrated nitric acid on eafTelne. Sten-le obtained a compound baring the compofiition C^H^N^Og, rbich he gave the name of nitro-tlulm^ RcvchlLnlcr then d that this Ixxly is also obtiiined when caffeine ia treated

chlorine in presence of water, whilst^ tdgotlier with this, tic acid, CigHigN^O^, methylanaine, nnd cyanogen chlorido Ibrmed. Stenhouse's compound was termed ch4jhstroph4tm,^ Bg to its similarity to the body cholesterine corit^iinod tn tlio Strecker then showed that this compound is dimvthyl-c acid, and tliat amalic acid is tetmiiiethyl^alloxantin.'^ proved that when caffeine is heated with baryta-water,

n dioxide and caffeidine, Cyi^jN/Jjarw foruioil *' TIuh Iwttor

is a strong base, which, when further heated with alkalis, is ammonia, methylamine, sarcosine (methylamiJo-acetic i), formic acid, and carbon dioxide ; ^

Fbese reactions show that caffeine contains the methyl group e times, and that its constitution must be very liimihir to i of uric acid. The investigations of E, Fii«;Iier have uub-(tiated this in a remarkable manner. He hm shown that Mme, when acted upon by oxidizing agents, is convertt4 , into dimethyl-alluxan ami monometbyl-urea, whilst uric tbus treated gives, as has been ^tateil, alloxan and urea.

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