Amines dimethylamine

The photoamination of naphthalene, several substituted naphthalenes, anthracene and phenanthrene with ammonia, methylamine or benzylamine in aqueous acetonitrile in the presence of m-dicyanobenzene gave aminated dihydroarenes, e.g. 155. Secondary amines (dimethylamine and diethylamine) react less efficiently149. 9-Methoxyphenanthrene and... 

Three acyclic amines, dimethylamine (109), putrescine (111), and spermidine (110), have been isolated from the accessary sexual glands of the mature male desert locust, Schistocerca gregaria (Table VIII). In addition, A -pyrroline (12i) has been identified as a volatile emanating from the mature male locust colony (Table II). It is an oxidation product of putrescine and probably could be responsible for the maturation-accelerating effect observed to be specific to the mature male insect 106). 

The ZPE + (Hj — Hq) energies of amines and hydrazines also obey simple additivity rules [191] (Table 9.3). For the amines, one can predict their ZPE + (Hj- — Hq) energies from that of NH3 (22.94 kcal/mol) and the appropriate alkane, Eq. (9.9), by subtracting 11.55 kcal/mol for each pair of H atoms lost during the condensation, giving the amine. Dimethylamine, for example, is estimated by taking twice the value of CH4 plus that of NH3, less twice 11.55 kcal/mol. We proceed in similar fashion with the aUcyl-substituted hydrazines. 

AMINES. An amine is a derivative of NH3 in which there is a replacement for one or more of the H atoms of Nil, by an alkyl group, such as -CH3 (methyl) or -C2H5 (ethyl) or by an aryl group, such as (>, H (phenyl) or i ll (naphthyl). Mixed amines contain at least one alkyl and one aryl group as exemplified by methylphenylamine CH3 Nnij O.H . When one, two, and three H atoms arc thus replaced, the resulting amines ate known as primary, secondary, and tertiary, icspectively. Thus, methylamine, CH3NH2, is a primary amine dimethylamine, iCHj) NH, is a secondary amine and trimethylamine. (CHs N. is a tertiary amine. Secondary amines sometimes are called imines tertiary amines, nitriles. 

Functionalization is completed by aminating the chloromethylated copolymer with either primary or secondary amines. Dimethylamine [124-40-3] (6) is generally preferred, especially in the synthesis of the macroporous anion exchangers. 

Here is another example, using a secondary amine, dimethylamine. Try writing down the mechanism now without looking at the one above. Again, two equivalents of dimethylamine are necessary, though the chemists who published this reaction added three for good measure. 

Upon heating the title formamidine with a secondary amine, dimethylamine is extruded, affording a chiral formamidine derivative of the original amine (eq 3). ... 

The chlorine atoms in the 1,3,5,2/l -triazaphosphinines have acid chloride character and are readily replaced by nucleophiles. In the 2,2,4-trichloro compounds (229) the reaction with amines occurs selectively. At a molar ratio of (229) to amine of 1 2 only the C-4 chlorine is replaced. With excess of amine (dimethylamine, morpholine, ethylamine) the triamino derivatives (231) are formed, even at 20 °C. The reaction with diethylamine stops at the stage of the monoamino derivative (230) for steric reasons (Scheme 47) <79ZOBi777>. 

In Table 1, the heats of addition reactions are shown for four series of compounds. The first series (a) is for the reactions between boron trimethyl and either ammonia or the methylamines, and shows the steady rise in — /III values, along the series ammonia, methyl-amine, dimethylamine with a fall on passing from dimethylamine to trimethylamine. 

The tBu-XPhos ligand 28b embedded in the Pd(0) precursor X was particularly useful for the coupling of the smallest secondary aliphatic amine, dimethylamine, with aryl chlorides (Scheme 13.55) [108]. 

The basicity of quinuclidine, which depends on the electron density at the nitrogen atom, is relatively high (pKa 10.58) [16] and close to the basicity of the aliphatic amines (dimethylamine, pKa 10.77 diethylamine, pKa 10.93 tri-ethylamine, pKa 10.87) and the AT-alkylpiperidines (iV-methylpiperidine, pKa 10.08) [19]. In condensed benzo- and dibenzoquinuclidine systems (benzoquinuclidine, pKa 7.79 dibenzo-quinuclidine, pKa 4.46) the basicity [19] is lower because of the inductive effect of the phenyl groups [16, 20]. 

There have been reviews of the early work on direct dissolution (73,74). The efforts to dissolve cellulose directly as a base using phosphoric, sulfuric, and nitric protonic acids, or zinc chloride, thiocyanates, iodides, and bromides as Lewis acids are recorded (73,74). With regard to cellulose acting as an acid, sodium zincate, hydrazine, and sodium hydroxide are listed as inorganic solvents, and quaternary ammonium hydroxides, amines, dimethylamine-DMSO mixtures, and... 

Using this systematic way of naming amines, dimethylamine should be named N-methylmethylamine and trimethylamine should be named N,N dimethylmethylamine. 

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