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phthalic

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phthalic

phthalic Sentence Examples

  • This is obviously unsymmetrical, consisting of an aliphatic and an aromatic nucleus; Claus explained the formation of the same phthalic acid from the oxidation of either nucleus by supposing that if the aromatic group be oxidized, the aliphatic residue assumes the character of a benzene nucleus.

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  • Dimethyl-meta-aminophenol crystallizes in small prisms which melt at 87° C. It condenses with phthalic anhydride to form rhodamine, and with succinic anhydride to rhodamine S.

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  • Such a series of typical compounds are the benzene dicarboxylic acids (phthalic acids), C 6 H 4 (000H) 2.

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  • von Baeyer's researches (commenced in 1886) on the reduced phthalic acids.

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  • 149, p. 20) established the symmetry of the naphthalene nucleus, and showed that whichever half of the molecule be oxidized the same phthalic acid results.

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  • A notable example is provided by the phthaleins, which result by the condensation of phthalic anhydride with phenols.

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  • An important oxidation synthesis of aromatic acids is from hydrocarbons with aliphatic side chains; thus toluene, or methylbenzene, yields benzoic acid, the xylenes, or dimethyl-benzene, yield methyl-benzoic acids and phthalic acids.

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  • Chromic acid oxidizes it to retene quinone, phthalic acid and acetic acid.

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  • Dorp (Ber.,1874,7,P.578) obtained orthobenzoyl benzoic acid by heating phthalic anhydride with benzene in the presence of aluminium chloride.

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  • It acts as a weak antiseptic. It is used for enriching coal gas, as a vermin killer, in the manufacture of certain azo dyes, and in the preparation of phthalic acid (q.v.).

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  • Chromic acid in glacial acetic acid solution oxidizes it to picene-quinone, picene-quinone carboxylic acid, and finally to phthalic acid.

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  • can also be synthesized by heating catechol with phthalic anhydride and sulphuric acid at 150 C. ' 'C 6 H4>Cg>O+C 6 H4(OH)2[1.2] = H 2 0 -}-C6H4C6H2(OH)2.

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  • Anthragallol is synthetically prepared by the condensation of benAoic and gallic acids with sulphuric acid OH i [[Cooh + I 10h - 2h20+ Hooc /Oh]] or from pyrogallol and phthalic anhydride in the presence of sulphuric acid or zinc chloride.

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  • Oxidation by potassium permanganate gives phthalic acid; whilst chromic acid gives carbon dioxide and water.

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  • By oxidation with alkaline potassium permanganate it yields phthalic acid and cinchomeronic acid.

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  • KOnigs, and the observation that anthraquinone yielded oxyanthraquinones when treated in the cold with strong sulphuric acid, and the recent introduction of fuming sulphuric acid for the oxidation of naphthalene to phthalic acid, a process of great value in the manufacture of artificial indigo, may be noted.

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  • The A 2 acid is formed along with the A 4 acid by reducing phthalic acid with sodium amalgam in hot solutions.

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  • The A 4 acid exists in cis- and transforms. The trans-variety is produced by reducing phthalic acid, and the cis-acid by reducing 2.4 dihydrophthalic acid.

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  • The 2' acid is formed when phthalic acid is reduced in the cold by sodium amalgam or by heating the A 2 ' 4 and A 3 " acids with caustic soda.

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  • "The trans-modification of A3 5 acid is produced when phthalic acid is reduced by sodium amalgam in the presence of acetic acid.

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  • Sodium amalgam (hot) Sodium amalgam ± acetic acid Phthalic Acid Sodium amalgam (cold) Bo with Dihydro o Boil with water water 1'5 Dihydro Sodium amalgam Boil + NaOH Tetrahydro Dibromide -{- Reduce alcoholic potash D1HYDRO TEREPhthalic Acid Tropilene, C 7 H 10 0, is obtained in small quantities by the distillation of methyltropine methyl hydroxide, and by the hydrolysis of 13methyltropidine with dilute hydrochloric acid.

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  • PHTHALIC ACIDS, or Benzene Dicarboxylic Acids, CmH 4 (CO 2 H) 2.

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  • There are three isomers: (1) ortho, or phthalic acid; (2) meta, or isophthalic acid; (3) para, or terephthalic acid.

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  • It forms white crystals, melting at 213° with decomposition into water and phthalic anhydride; the latter forms long white needles, melting at 128° and boiling at 284°.

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  • Phthalimide, C6H4(CO)2NH, is formed by heating phthalic anhydride or chloride in ammonia gas or by molecular rearrangement of ortho-cyanbenzoic acid.

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  • The barium salt (+6H 2 0) is very soluble (a distinction between phthalic and terephthalic acids).

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  • For the reduced phthalic acids see Polymethylenes.

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  • Unlike resorcin it does not give a fluorescein with phthalic anhydride.

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  • Koppers makes carbon pitch, coal tar distillates, and phthalic anhydride and ships products to customers in rail cars.

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  • Dimethyl-meta-aminophenol crystallizes in small prisms which melt at 87° C. It condenses with phthalic anhydride to form rhodamine, and with succinic anhydride to rhodamine S.

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  • He admitted the possibility of the formulae of Kekule, Claus, Dewar and Ladenburg, although as to the last di-trimethylene derivatives should be possible reduction products, being formed by severing two of the prism edges; and he attempted to solve the problem by a systematic investigation of the reduced phthalic acids.

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  • It is a colourless liquid which boils at 247° C. The -CH 3 group is very reactive, condensing readily with aldehydes and with phthalic anhydride.

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  • Phthalic acid was obtained by Laurent in 1836 by oxidizing naphthalene tetrachloride, and, believing it to be a naphthalene derivative, he named it naphthalenic acid; Marignac determined its formula and showed Laurent's supposition to be incorrect, upon which Laurent gave it its present name.

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  • It forms white crystals, melting at 213° with decomposition into water and phthalic anhydride; the latter forms long white needles, melting at 128° and boiling at 284°.

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  • C. Graebe (Ann., 1869, 149, p. 22) orientated the ortho-compound or phthalic acid from its formation from naphthalene on oxidation; the meta-compound or isophthalic acid is orientated by its production from mesitylene, shown by A.

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  • It is a colourless liquid which boils at 247° C. The -CH 3 group is very reactive, condensing readily with aldehydes and with phthalic anhydride.

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