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phenolic

phenolic

phenolic Sentence Examples

  • When heated with concentrated hydrochloric acid the amino group is replaced by the hydroxyl group and the phenolic eurhodols are produced.

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  • With zinc dust in presence of caustic soda it yields the secondary alcohol oxanthranol, C 6 H 4: CO Choh: C 6 H 4, with tin and hydrochloric acid, the phenolic compound anthranol, C5H4: CO.

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  • They may be prepared by the reduction of nitro compounds in alkaline solution (using zinc dust and alkali, or a solution of an alkaline stannite as a reducing agent); by oxidation of hydrazo compounds; or by the coupling of a diazotized amine and any compound of a phenolic or aminic type, provided that there is a free para position in the amine or phenol.

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  • Hantzsch (Ber., 18 99, 3 2, pp. 59 o, 3089) considers that the oxyazo compounds are to be classed as pseudoacids, possessing in the free condition the configuration of quinone hydrazones, their salts, however, being of the normal phenolic type.

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  • Hewitt has also attacked the problem by brominating the oxyazobenzenes, and has shown that when the hydrobromic acid produced in the reaction is allowed to remain in the system, a brombenzene-azo-phenol is formed, whilst if it be removed (by the addition of sodium acetate) bromination takes place in the phenolic nucleus; consequently the presence of the mineral acid gives the azo compound a pseudo-quinonoid character, which it does not possess if the mineral acid be removed from the sphere of the reaction.

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  • Journ., 1888, 9, pp. 389 et seq.) have shown that the main product of this reaction is usually a phenolic ether.

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  • Jochem (Ber., 1901, 34, p. 3337), who arrived at the conclusion that the normal decomposition of diazonium salts by alcohols results in the formation of phenolic ethers, but that an increase in the molecular weight of the alcohol, or the accumulation of negative groups in the aromatic nucleus, diminishes the yield of the ether and increases the amount of the hydrocarbon formed.

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  • It dissolves readily in caustic alkalis on account of its phenolic character, and it forms a yellow-coloured di-acetate.

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  • However, there may potentially be changes caused within the phenolic compounds by the processing, which may affect bioavailability.

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  • London: Orbis Publishing Towers GHN, Tse A, Maass WSG (1966) Phenolic acids and phenolic glycosides of Gaultheria species.

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  • plasterboard backed with 100mm of phenolic insulating foam.

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  • ODC s are used in the production of polyurethane, polystyrene and other polyolefin or phenolic foams.

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  • The other possible circumstances where high exposures may occur is in the use of phenolic resins in foundries.

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  • Naturally occurring salicylates and phenolic compounds are a problem in perhaps half of all cases.

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  • 6), melts at 180-181°C. The simple oxypyrimidines are obtained by the action of nitrous acid on the amino derivatives, or by heating these latter with concentrated hydrochloric acid to 180° C. They show both basic and phenolic properties and are indifferent to the action of reducing agents.

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  • When heated with concentrated hydrochloric acid the amino group is replaced by the hydroxyl group and the phenolic eurhodols are produced.

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  • With zinc dust in presence of caustic soda it yields the secondary alcohol oxanthranol, C 6 H 4: CO Choh: C 6 H 4, with tin and hydrochloric acid, the phenolic compound anthranol, C5H4: CO.

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  • They may be prepared by the reduction of nitro compounds in alkaline solution (using zinc dust and alkali, or a solution of an alkaline stannite as a reducing agent); by oxidation of hydrazo compounds; or by the coupling of a diazotized amine and any compound of a phenolic or aminic type, provided that there is a free para position in the amine or phenol.

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  • Chem., 1896, 21, p. 355; Ber., 1900, 33, p. 1302)examined the questionfromthe physico-chemical standpoint by determining the freezing-point depressions, the result being that the para-oxyazo compounds give abnormal depressions and the ortho-oxyazo compounds give normal depressions; Auwers then concluded that the para compounds are phenolic and the ortho compounds are quinone hydrazones or act as such.

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  • Hantzsch (Ber., 18 99, 3 2, pp. 59 o, 3089) considers that the oxyazo compounds are to be classed as pseudoacids, possessing in the free condition the configuration of quinone hydrazones, their salts, however, being of the normal phenolic type.

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  • Hewitt has also attacked the problem by brominating the oxyazobenzenes, and has shown that when the hydrobromic acid produced in the reaction is allowed to remain in the system, a brombenzene-azo-phenol is formed, whilst if it be removed (by the addition of sodium acetate) bromination takes place in the phenolic nucleus; consequently the presence of the mineral acid gives the azo compound a pseudo-quinonoid character, which it does not possess if the mineral acid be removed from the sphere of the reaction.

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  • Journ., 1888, 9, pp. 389 et seq.) have shown that the main product of this reaction is usually a phenolic ether.

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  • Jochem (Ber., 1901, 34, p. 3337), who arrived at the conclusion that the normal decomposition of diazonium salts by alcohols results in the formation of phenolic ethers, but that an increase in the molecular weight of the alcohol, or the accumulation of negative groups in the aromatic nucleus, diminishes the yield of the ether and increases the amount of the hydrocarbon formed.

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  • It dissolves readily in caustic alkalis on account of its phenolic character, and it forms a yellow-coloured di-acetate.

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  • The other possible circumstances where high exposures may occur is in the use of phenolic resins in foundries.

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  • Naturally occurring salicylates and phenolic compounds are a problem in perhaps half of all cases.

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  • Roobios-also called African red tea; the herb is touted as a rich source of antioxidants, flavanoids, and quartering, luteolin and phenolic acids.

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  • Current materials frequently seen in hard hats include polycarbonate, Kevlar, aluminum, phenolic, and plastic.

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