Amine sentence example

amine
  • It has to some extent the character of a secondary amine; the hydrogen of the imino group can be replaced by potassium.
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  • The structural relations of these compounds may be shown thus: NH 3; NH2R; Ammonia; primary amine; NHR 2; NR3; NR41.
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  • secondary amine; tertiary amine; quaternary ammonium iodide.
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  • Many methods have been devised for the preparation of the amines, the first amine having been isolated in 1849 by A.
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  • The aqueous solution of the amines is now shaken up with diethyl oxalate, when the primary amine forms a crystalline dialkyl oxamide and the secondary amine an insoluble liquid, which is an ethyl dialkyl oxamate, the tertiary amine not reacting: (C02C2H5)2+ 2NH 2 R = (CO�NHR) 2 -{- 2C 2 H S OH; (CO 2 C 2 H 5) 2 -}- NHR 2 = C 2 H S O 2 C�Conr 2 -1-C 2 H S Oh.
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  • The tertiary amine is then distilled off, the residual products separated by filtration and finally hydrolysed by a caustic alkali.
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  • At a temperature of about 300-400° C. the alkyl chloride formed in this reaction attacks the benzene nucleus and replaces hydrogen by an alkyl group or groups, forming primary amines homologous with the original amine; thus methylaniline hydrochloride is converted into paraand ortho-toluidine hydrochloride, and trimethyl phenyl ammonium iodide is converted into mesidine hydriodide.
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  • The secondary amines may be of two types-namely,the purely aromatic amines, and the mixed secondary amines, which contain an aromatic residue and an alkyl group. The purely aromatic amines result upon heating the primary amines with their hydrochlorides, and, in some cases, by heating a phenol with a primary amine and anhydrous zinc chloride.
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  • The mixed secondary amines are prepared by the action of alkyl iodides on the primary amines, or by heating salts of the primary amine with alcohols under pressure.
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  • The simplest aromatic tertiary amine, triphenylamine, is prepared by the action of brombenzene on sodium diphenylamine (C. Heydrich, Ber., 1885, 18, p. 2156).
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  • The aromatic amine resembling the aliphatic amines is benzylamine, C 6 H 5 �CH 2 �NH 2, which may be prepared by reducing benzonitrile in alcoholic solution by means of zinc and acetic acid (0.
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  • Sodium in boiling amyl alcohol reduces it to aromatic tetrahydro-a-naphthylamine, a substance having the properties of an aromatic amine, for it can be diazotized and does not possess an ammoniacal smell.
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  • SAFRANINE, in chemistry, the azonium compounds of symmetrical diamino-phenazine and containing the ring system annexed: / N / or X N .% CI R C1 R They are obtained by the joint oxidation' of one molecule of a paradiamine with two molecules of a primary amine; by the condensation of para-aminoazo compounds with primary amines (0.
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  • Soc., 1902, 81, p. 1 59 6) who showed that the products obtained by the action of alkyl iodides on the isonitriles in alcoholic solution at 100° C. yield amine hydroidides and formic acid when hydrolysed.
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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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  • Diazo-Amines.-The diazo-amines, R N: N NHR I, are obtained by the action of primary amines on diazonium salts; by the action of nitrous acid on a free primary amine, an isodiazohydroxide being formed as an intermediate product which then condenses with the amine; and by the action of nitrosamines on primary amines.
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  • Goldschmidt, Ber., 1888, 21, p. 2578), and on reduction with zinc dust (preferably in alcoholic acetic acid solution) they yield usually a hydrazine and an amine.
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  • Tschelinzeff (Ber., 1904, 37, p. 4534) showed that the ether may be replaced by benzene containing a small quantity of ether or anisole, or a few drops of a tertiary amine.
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  • Chloroform may be readily detected by the production of an isonitrile when it is heated with alcoholic potash and a primary amine; thus with aniline, phenyl isocyanide (recognized by its nauseating smell) is produced, CHC13+C6H5NH2+3KHO=C6H5NC+3KC1+3H20.
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  • In this process the amine salt is dissolved in absolute alcohol and diazotized by the addition of amyl nitrite; a crystalline precipitate of the diazonium salt is formed on standing, or on the addition of a small quantity of ether.
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  • The diazonium salts are characterized by their great reactivity and consequently are important reagents in synthetical processes, since by their agency the amino group in a primary amine may be exchanged for other elements or radicals.
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  • Replacement of -NH 2 by-OH:-The amine is diazotized and the aqueous solution of the diazonium salt is heated, nitrogen being eliminated and a phenol formed.
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  • Concentrated acids convert them into the isomeric nitro-amines, the - NO 2 group going into the nucleus in the orthoor paraposition to the amine nitrogen; this appears to indicate that the compounds are nitramines.
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  • Hantzsch, Ber., This assumption also shows the relationship of the diazonium hydroxides to other quaternary ammonium compounds, for most of the quaternary ammonium hydroxides (except such as have the nitrogen atom attached to four saturated hydrocarbon radicals) are unstable, and readily pass over into compounds in which the hydroxyl group is no longer attached to the amine nitrogen; thus the syn-diazo hydroxides are to be regarded as pseudo-diazonium derivatives.
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  • NHR, may be prepared by the action of the primary and secondary amines on the diazonium salts, or by the action of nitrous acid on the free primary amine.
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  • In the latter reaction it is assumed that the isodiazohydroxide first formed is immediately attacked by a second molecule of the amine.
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  • It has also been shown that when different salts of the amine are used, their catalytic influence varies in amount and is almost proportional to their degree of ionization in aqueous solution.
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  • On the other hand, at about 240° C., the amine and ester react to form 13-anilidocrotonic ester, CH 3 C(NHC 6 H 5): CH COOC2H5r which yields y-oxy-a-methylquinoline (M.
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  • amine Adalbero s behaviour.
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  • The attachment method comprises of a hydrophilic polymer network bound to the surface and contains amine or carboxylic reactive groups for end-point attachment.
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  • Labeling in vitro is generally performed non-specifically using amine or thiol reactive reagents.
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  • making a primary amine The reaction happens in two stages.
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  • The document concludes that a large number of food products exceeded the government maximum permitted limit of histamine, a biogenic amine, a biogenic amine.
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  • An aromatic primary amine is one in which the -NH 2 group is attached directly to a benzene ring.
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  • In a tertiary amine there aren't any hydrogen atoms attached directly to the nitrogen.
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  • amine oxidases.
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  • amine precursor, uptake and decarboxylation) cells.
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  • amine groups in the solution.
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  • amine monomers studied was detected in extracts or migration solutions.
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  • amine ligand to the oxidant produces a complex with very special reactivity.
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  • Figure 1. Spectral changes spaced a minute apart during enzyme catalysis in crystals of E. coli amine oxidase.
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  • These enzymes represent a special class of the copper amine oxidases.
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  • aromatic primary amine is one in which the -NH 2 group is attached directly to a benzene ring.
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  • biogenic amine.
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  • degrading of proteins and nucleic acid, biogenic amine metabolism and is necessary for RNA chain initiation.
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  • enzyme catalysis in crystals of E. coli amine oxidase.
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  • guanine amine at this same position would push the drug away; hence its AT specificity.
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  • They are generally ambient cure when cured with an epoxy amine hardener.
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  • An ammonium ion is formed, together with an amine.
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  • That means that the primary amine is going to be a better nucleophile than ammonia is.
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  • Regional cerebral perfusion was also assessed using technetium-99m hexamethylpropylene amine oxime.
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  • They develop from ' apud ' (amine precursor, uptake and decarboxylation) cells.
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  • These enzymes catalyze many reactions such as carbon skeleton rearrangements or the removal of a methyl group from a tertiary amine.
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  • sympathomimetic amine, which is quite similar to an amphetamine.
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  • tertiary amine there aren't any hydrogen atoms attached directly to the nitrogen.
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  • The aqueous solution of the amines is now shaken up with diethyl oxalate, when the primary amine forms a crystalline dialkyl oxamide and the secondary amine an insoluble liquid, which is an ethyl dialkyl oxamate, the tertiary amine not reacting: (C02C2H5)2+ 2NH 2 R = (CO�NHR) 2 -{- 2C 2 H S OH; (CO 2 C 2 H 5) 2 -}- NHR 2 = C 2 H S O 2 C�Conr 2 -1-C 2 H S Oh.
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  • At a temperature of about 300-400° C. the alkyl chloride formed in this reaction attacks the benzene nucleus and replaces hydrogen by an alkyl group or groups, forming primary amines homologous with the original amine; thus methylaniline hydrochloride is converted into paraand ortho-toluidine hydrochloride, and trimethyl phenyl ammonium iodide is converted into mesidine hydriodide.
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  • When warmed with a solution of nitrous acid, they are converted into phenols; if, however, nitrous acid be added to an ice-cold solution of a primary amine in excess of mineral acid, a diazonium salt is formed (see Az o Compounds and DIAzO Compounds), or in absence of excess of acid, a diazoamine is produced.
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  • The aromatic amine resembling the aliphatic amines is benzylamine, C 6 H 5 �CH 2 �NH 2, which may be prepared by reducing benzonitrile in alcoholic solution by means of zinc and acetic acid (0.
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  • They may also be obtained by distilling a primary amine with alcoholic potash and chloroform: R NH 2 -{- CHC1 3 3KHO=3KC1 -}- 3H 2 O -}- R NC (A.
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  • Soc., 1902, 81, p. 1 59 6) who showed that the products obtained by the action of alkyl iodides on the isonitriles in alcoholic solution at 100° C. yield amine hydroidides and formic acid when hydrolysed.
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  • p. 670) that the velocity of formation of the amino-azo compound depends only on the nature of the reagents and not on the concentration, and that in coupling the hydrochloride of a tertiary amine with diazobenzene suiphonic acid the reaction takes place between the acid and the base set free by the hydrolytic dissociation of its salt, for the formation of the amino-azo compound, when carried out in the presence of different acids, takes place most rapidly with the weakest acid (H.
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  • They are crystalline solids, usually of a yellow colour, which do not unite with acids; they are readily converted into amino-azo compounds (see above) and are decomposed by the concentrated halogen acids, yielding haloid benzenes, nitrogen and an amine.
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  • These compounds may be divided into two classes, namely, the true diazo compounds, characterized by the grouping -N=N-, and the diazonium compounds, characterized by the grouping N: N < The diazonium compounds were first discovered by P. Griess (Ann., 1858,, 06, pp. 123 et seq.), and may be prepared by the action of nitrous fumes on a well-cooled solution of a salt of a primary amine, C 6 H 5 NH 2 HNO 3 HNO 2 = C 6 H 5 N 2 .NO 3 2H20, or, as is more usually the case (since the diazonium salts themselves are generally used only in aqueous solution) by the addition of a well-cooled solution of potassium or sodium nitrite to a well-cooled dilute acid solution of the primary amine.
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  • Reinders (Ber., 1896, 29, p. 1369, 1899) have shown that the transformation is a monomolecular reaction, the velocity of transformation in moderately dilute solution being independent of the concentration, but proportional to the amount of the catalyst present (amine hydrochloride) and to the temperature.
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  • On the other hand, at about 240° C., the amine and ester react to form 13-anilidocrotonic ester, CH 3 C(NHC 6 H 5): CH COOC2H5r which yields y-oxy-a-methylquinoline (M.
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  • When an imbalance occurs, the body produces histamine, a biogenic amine, which is released from the mast cells of the skin.
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  • amine compounds or sodium salts of fatty acids.
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