amine

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amine

 [am´in, ah´mēn]
an organic compound containing nitrogen.
biogenic amine bioamine.
sympathomimetic a's amines that mimic the actions of the sympathetic nervous system, the group includes the catecholamines and drugs that mimic their actions.
vasoactive a's amines that cause vasodilation and increase small vessel permeability, such as histamine and serotonin.

a·mine

, primary aminesecondary aminetertiary aminequaternary ammonium ion (ă-mēn', am'in), Although this word is correctly stressed on the first syllable, U.S. usage often stresses it on the last syllable.
A substance formally derived from ammonia by the replacement of one or more of the hydrogen atoms by hydrocarbon or other radicals. The substitution of one hydrogen atom constitutes a primary amine; that of two atoms, a secondary amine; that of three atoms, a tertiary amine; and that of four atoms, a quaternary ammonium ion, a positively charged ion isolated only in association with a negative ion. The amines form salts with acids.

a·mine

(ă-mēn')
A substance derived from ammonia by the replacement of one or more of the hydrogen atoms by hydrocarbon or other radicals. The substitution of one hydrogen atom constitutes a primary amine, e.g., NH2CH3; that of two atoms, a secondary amine, e.g., NH(CH3)2; that of three atoms, a tertiary amine, e.g., N(CH3)3; and that of four atoms, a quaternary ammonium ion, e.g., +N(CH3)4, a positively charged ion isolated only in association with a negative ion. The amines form salts with acids.

amine

A class of organic compounds derived from ammonia by replacing one or more of the hydrogen atoms by a member of the paraffin series or by an aromatic group. Amines occur widely in the body, and many drugs are amines.

amine

an organic base formed by replacing one or more of the hydrogen atoms of ammonia by organic groups.

a·mine

(ă-mēn') Although this word is correctly stressed on the first syllable, U.S. usage often stresses it on the last syllable as shown here.
A substance formally derived from ammonia by the replacement of one or more of the hydrogen atoms by hydrocarbon or other radicals.
References in periodicals archive ?
Saga et al., "Ultra-sensitive HPLC-photochemical reaction-luminol chemiluminescence method for the measurement of secondary amines after nitrosation," Analytica Chimica Acta, vol.
To infer this phenomenon, the authors used an excess amount of hardener (r = 1.2) and determined the reaction enthalpy by dynamic DSC and obtained higher values (109.0, 98.3, and 105.2, resp., for mixtures containing 0, 0.1, and 0.25 wt% of CNTs) compared to systems with stoichiometric ratio (92.3, 80.8, and 88.8, resp., for mixtures containing 0, 0.1, and 0.25 wt% of CNTs) which implies different reactivity of the primary and secondary amines. Molecular simulation confirmed the consequence of DDM adsorption into CNTs and reasoned the lower values of cure enthalpy after amine functionalization.
Table 5: Pseudo-first-order competitive rate data for primary and corresponding secondary amines (19) Primary amine [k.sub.2[degrees]Me/1[degrees]] Solvent n-Butylamine 2.1 Ethanol t-Butylamine 1.2 Ethanol Cyclododecylamine 1.2 Ethanol Cyclohexylamine 1.4 t-Amyl alcohol Ethylene diamine 1.6 t-Amyl alcohol Based on this insight, we decided to target two types of dimethyl substituted diamines: one with a linear chain separating the methylamine groups, and one with a xylylene moiety separating them.
This is attributed to the delayed cross-linking reaction owing to the secondary amine on the D-MWCNT surfaces, which acts as a curing agent for the epoxy resin [32].
The secondary amine addition product was not observed, indicating the secondary amine nucleophilicity is substantially reduced.
The epoxy, primary amine, and secondary amine concentrations were calculated using the integrated area under each respective peak using Lambert-Beer's law while the total amine H concentration was calculated by adding the primary amine H and secondary amine H concentrations from each spectrum.
Walker's presentation, scheduled for Wednesday afternoon, October 15, is entitled "Dimethyl Secondary Amine Chain Extenders: A Conceptual Approach to In Situ Generation of Advanced Epoxy Resins for Rapid-Cure, Low-VOC Coatings."
For kinetic experiments, aniline, N-methyl aniline, and dimethyl aniline, (a primary amine, a secondary amine, and a tertiary amine) were also obtained from Aldrich.
In general, a combination of an epoxy resin and a primary amine leads to two principal reactions of (a) the addition reaction of a primary amine hydrogen to an epoxy group to form a secondary amine and (b) the addition reaction of an amine hydrogen in the secondary amine to another epoxy group to create a tertiary amine [21, 22],
Due to the known difficulty of selective alkylation at the N1-position, the Mannich reaction at the C3-position with a secondary amine and formaldehyde was chosen as a first priority.
The formation of nitrosamines is dependent upon the secondary amine that is given off by the break-up of the rubber accelerator being volatile enough to come out of the rubber compound and react with NOx in the air.
The rates of Michael addition of primary amines are higher than that of secondary amines [22], therefore, Michael addition of the secondary amine (piperazine) to HABP was proceeded for 48 h at 38[degrees]C to ensure the completion of the reaction.