Amines, cyclic methylamine

Mannich condensations involving polyamines or polynitramines are more complex, and in the case of linear dinitramines, leads to very interesting and diverse chemistry, enabling the synthesis of many cyclic nitramine products. The reaction of methylenedinitramine (168) with various primary amines in the presence of formaldehyde leads to l,5-dinitro-l,3,5,7-tetraazacyclooctanes the 3,7-dimethyl analogue (186) is isolated when methylamine is used. ... 

Solid cyclic carboxylic anhydrides react with gaseous ammonia to give amide ammonium salts with quantitative yield. This has been observed with the labile Diels-Alder adduct 259 [25] (Scheme 38). Aliphatic amine vapors are equally able to open anhydride rings to form the amide salts from where the free amide acids can be obtained in 100% yield. The reaction of 261 with ethylamine to give 262 is an example of a large-scale preparative application [11-12]. Conversely, solid pyromellitic bis-anhydride (263) and methylamine vapor react exother-mally (rise to 95 °C) and quantitatively to yield the tetraamide 264. Interest-... 

V,Af-Dimethylaniline A A,A, AT-Tetramethyl-p-phenylenediamine Cyclic amines 4,4 -Bipyridyl Quinoline Pyridine A-oxide Pyridinium chloride Hydroxides CsOH LiOH NaOH Triton B6 Alkylamines Ammonia Methylamine Ethylamine Propylamine Butylamine Decylamine Dodecylamine Tridecylamine Tetradecylamine Pentadecylamine Hexadecylamine Heptadecylamine Octadecylamine Tributylamine Miscellaneous Ammonium acetate Hydrazine Potassium formate Guanidine... 

The reaction of 2-amino-4,5-dihydro-3-furancarboxylic esters (51) with amines appears interesting85. In contrast to the structure assigned earlier86-88, the reaction products have been later identified as 1,1-enediamines attached to a lactone moiety85. Thus, substrate 51 reacts with methylamine to give acyclic 1,1-enediamines 52 with an approximate E/Z ratio of 40 60. The reaction involves 4,5-dihydrofuran ring-opening and lactone-formation steps (Scheme 3). In the case of ethylenediamine and 1,3-diaminopropane, the reaction of 51 leads to the formation of cyclic 1,1-enediamine... 

The data available suggest that the Hg-sensitized photolysis of acyclic aliphatic amines (47,237,235) yields the same products that are found In the direct photolysis (see above) but perhaps in different proportion. Hydrogen, ammonia, and a cyclic trlmer of N-methylmethyleneimine were obtained from methylamine (237). Baum et al. (235) suggested that the Hg-sensitized photolysis of primary and secondary amines is of preparative value for the synthesis of N-alkylalkylideneimines. 

The bis bromomethyl compound 155 reacts with primary amines to give 2-substituted 1,3-dihydro compounds such as 156. Secondary amines provide cyclic quaternary salts. Piperazine and morpholine yield the spiro quaternary derivatives 157. The mono- and di-N-oxides of the bromomethylquinoxaline 155 react with liquid methylamine to give the l,3-dihydro-2-methyl compounds in which one of the N-oxide functions has been reduced. Thus the mono-N-oxide of 155 gives the iV-methyl derivative 158. This compound is also obtained... 

Figure 18 shows typical cyclic voltammetric i-E curves for 1.0 mM (A) cadaverine (CAD), (B) putrescine (PUT), (C) spermidine (SPMD), and (D) 0.8 mM spermine (SPM) in borax buffer pH 11 (BBpHll) at a microcrystalline diamond thin film deposited from a 0.5% CH4/H2 ratio and 10 ppm B2H6. Similarly shaped curves were observed for several other amines and polyamines (e.g., methylamine, ethylamine, propylamine, ethylenediamine, 1,3-diaminopropane, 1,6-hexamethylenediamine, and... 

Wang and co-workers [6] used a Py-GC technique for the qualitative analysis of fumaric acid and itaconic acid as low-level monomers polymerised with other major monomers in emulsion styrene maleic anhydride co-polymers. In order for fumaric acid and itaconic acid to be detected through pyrolysis, the acids are derivatised with primary amines such as methylamine and ethylamine to form a cyclic imide. The detection of derivatised fumaric acid and itaconic acid was accomplished by atomic emission detection. The structures of the derivatisation-pyrolysis products were elucidated by MS. 

The cellulose-dissolving potential of the amine oxide family was first realized (79) in 1939, but it was not until 1969 that Eastman Kodak described the use of cyclic mono(A7 -methylamine-A7 -oxide) compoimds, eg, Ai-methylmorpholine- -oxide [7529-22-8] (NMMO), as a solvent size for strengthening paper (80) by partially dissolving the cellulose fibers. 

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