Acetic-anhydride sentence example

acetic-anhydride
  • 7-dihydroxyxanthone, known as euxanthone, is prepared by heating euxanthic acid with hydrochloric acid or by heating hydroquinone carboxylic acid with 3-resorcylic acid and acetic anhydride (S.
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  • 6-dihydroxyxanthone, isoeuxanthone, is formed when 0-resorcylic acid is heated with acetic anhydride.
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  • Glucoseoxime on warming with acetic anhydride is simultaneously acetylated and dehydrated, yielding an acetylated gluconitrile, which when warmed with ammoniacal silver nitrate loses hydrocyanic acid and is transformed into an acetyl pentose.
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  • Wohl forms the oxime and converts it into an acetylated nitrile by means of acetic anhydride and sodium acetate; ammoniacal silver nitrate solution removes hydrocyanic acid and the resulting acetate is hydrolysed by acting with ammonia to form an amide, which is finally decomposed with sulphuric acid.
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  • When heated to about 200° it yields a brown amorphous substance, named caramel, used in colouring liquors, &c. Concentrated sulphuric acid gives a black carbonaceous mass; boiling nitric acid oxidizes it to d-saccharic, tartaric and oxalic acids; and when heated to 160° with acetic anhydride an octa-acetyl ester is produced.
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  • It is oxidized by nitric acid to d-saccharic and mucic acids; and acetic anhydride gives an octa-acetate.
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  • Krafft, Ber., 1883, 16, p. 3018): C16H33 CH2 CH2.0H->C161-133CH2 CH2.0 CO R-> C16H33CH: CH 2 -j-R COOH; from tertiary alcohols by the action of acetic anhydride in the presence of a small quantity of sulphuric acid (L.
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  • In making the acid by this process benzaldehyde, acetic anhydride and anhydrous sodium acetate are heated for some hours to about 180 C., the resulting product is made alkaline with sodium carbonate, and any excess of benzaldehyde removed by a current of steam.
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  • Fittig and his pupils (Annalen, 1883, 216, pp. loo, 115; 1885, 227, pp. 55, 119), in which it was shown that the aldehyde forms an addition compound with the sodium salt of the fatty acid, and that the acetic anhydride plays the part of a dehydrating agent.
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  • soc. chim., 18 95, (3) 1 3, p. 735); and from the syn-aldoximes by the action of acetyl chloride or acetic anhydride.
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  • Heated with anhydrous sodium acetate and acetic anhydride it gives cinnamic acid; with ethyl bromide and sodium it forms triphenyl-carbinol (C 6 H 5) 3 C OH; with dimethylaniline and anhydrous zinc chloride it forms leuco-malachite green C6H5CH[C6H4N(CH3)2]2; and with dimethylaniline and concentrated hydrochloric acid it gives dimethylaminobenzhydrol, C 6 H 5 CH(OH)C 6 H 4 N(CH 3) 2.
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  • The ethoxymethylene aceto-acetic esters are prepared by condensing aceto-acetic ester with ortho-formic ester in the presence of acetic anhydride (German patents 77354, 79087, 79863).
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  • Its hydrochloride melts at 163° C., and crystallizes from alcohol in colourless deliquescent prisms. Acetic anhydride converts the base into an acetamino-dimethyl pyrimidine, acetic acid and acetamide being also formed.
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  • Acetyl urea, NH 2 CO NH 000H 31 formed by the action of acetic anhydride on urea, crystallizes in needles which melt at 212° C. and, on heating, strongly decomposes into acetamide and cyanuric acid.
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  • 91, p. 1938) among the gaseous products formed when a platinum wire is electrically heated under the surface of acetic anhydride.
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  • The A l -' 4 acid is obtained as its anhydride by heating A 2.4 dihydrophthalic anhydride with acetic anhydride.
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  • When heated for some time with acetic anhydride it changes to the cis-form.
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  • The relationships existing between the various hydrophthalic acids may be shown as follows: - Dihydro (Trans.) Acetic anhydride A 3.5 Dihydro (Cis.) A.
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  • Dihydro Anhydride with acetic anhydride Sodium amalgam in faintly alkaline solution Sodium amalgam (hot) .1 Hydrobromide on reduction Remove H Br from 1.3 Dihydro dibromide Cyclo-heptane Group. Cyclo-heptane (suberane), C 7 H 14, obtained by the reduction of suberyl iodide, is a liquid which boils at 117° C. On treatment with bromine in the presence of aluminium bromide it gives chiefly pentabromtoluene.
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  • The osotriazoles are obtained by heating the osazones of orthodiketones with mineral acids; by the action of acetic anhydride on the hydrazoximes of orthodiketones, or by condensing diazo-methane with cyanogen derivatives (A.
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  • When heated to about 200° it yields a brown amorphous substance, named caramel, used in colouring liquors, &c. Concentrated sulphuric acid gives a black carbonaceous mass; boiling nitric acid oxidizes it to d-saccharic, tartaric and oxalic acids; and when heated to 160° with acetic anhydride an octa-acetyl ester is produced.
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  • CH2([[Coon)2+Ch3cho-->Ch3 Ch:C(000h)2->Ch3 Ch:Ch 000h]]; or by heating pyruvic acid with an excess of acetic anhydride and sodium acetate to 160-180° C. (B.
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  • Its hydrochloride melts at 163° C., and crystallizes from alcohol in colourless deliquescent prisms. Acetic anhydride converts the base into an acetamino-dimethyl pyrimidine, acetic acid and acetamide being also formed.
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  • It condenses with acetic anhydride to form a methyldiphenyl triazine, acetamide being also formed; with acetyl-acetone to form dimethylphenyl pyrimidine (A.
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  • Acetyl urea, NH 2 CO NH 000H 31 formed by the action of acetic anhydride on urea, crystallizes in needles which melt at 212° C. and, on heating, strongly decomposes into acetamide and cyanuric acid.
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  • Dihydro Anhydride with acetic anhydride Sodium amalgam in faintly alkaline solution Sodium amalgam (hot) .1 Hydrobromide on reduction Remove H Br from 1.3 Dihydro dibromide Cyclo-heptane Group. Cyclo-heptane (suberane), C 7 H 14, obtained by the reduction of suberyl iodide, is a liquid which boils at 117° C. On treatment with bromine in the presence of aluminium bromide it gives chiefly pentabromtoluene.
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