N- alkylamines

The corrosion of tin by nitric acid and its inhibition by n-alkylamines has been reportedThe action of perchloric acid on tin has been studied " and sulphuric acid corrosion inhibition by aniline, pyridine and their derivatives as well as sulphones, sulphoxides and sulphides described. Attack of tin by oxalic, citric and tartaric acids was found to be under the anodic control of the Sn salts in solution in oxygen free conditions . In a study of tin contaminated by up to 1200 ppm Sb, it was demonstrated that the modified surface chemistry catalysed the hydrogen evolution reaction in deaerated citric acid solution. 

Microemulsions can be generated using n-alkylamines as cosurfactant. These amines react with a substrate, e.g. 2,4-dinitrochlorobenzene, bound to the droplet, and the rate data can be analysed satisfactorily in terms of the concentration of amine in the droplet (Bunton and de Buzzaccarini, 1981b). 

Korenman, I.M., Gurevich, N.Yu., and Kulagina, T.G. Extraction of certain n-alkylamines from aqueous solutions, / Appl. 

Evans and co-workers demonstrated that rhodium-catalyzed allylic amination of enantiomerically enriched acyclic unsymmetrical allylic carbonates occurs with excellent regio- and enantiospedfidty (Tab. 10.5) [35]. Interestingly, while the classical nitrogen nucleophiles furnished allylic amination products in poor yield and with modest regioselectivity, the lithium anion of N-toluenesulfonyl-N-alkylamines proved optimal, in terms of nucleophilicity and basicity. 

The relative importance of N-substituted arylamines for the construction of biologically significant molecules, particularly pharmaceuticals and agrochemicals, prompted the extension of rhodium-catalyzed allylic amination to aniline nucleophiles (Tab. 10.6) [41, 42]. The N-arylsulfonyl-protected anihnes were again optimal for high selectivity, analogous to that observed with the N-toluenesulfonyl-N-aLkylamines. 

Considerable attention has been devoted to the study of intercalation compounds of the dichalcogenides (Whittingham, 1978 Subba Rao Shafer, 1979). Intercalation compounds of dichalcogenides can be divided into three categories (a) compounds with Lewis base type molecules such as ammonia, n-alkylamines, pyridines etc. (b) compounds with metal cations or molecular cations, Li, Na, K, etc., or [(C5H5)2Co]" and (c) compounds containing both cations and neutral polar (solvated) molecules in the van der Waals gap. 

Figure 8.7 Structures of TaS2-n-alkylamine intercalates (a) bilayer and (b) monolayer configuration of the intercalated amine.

The dichalcogenides of group VI do not readily form intercalates with organic molecules. But n-alkylammonium compounds can be prepared by ion-exchange reactions of the hydrated sodium intercalation compounds such as Na j(H20)o g M0S2. Alkylammonium compounds prepared by this route show lattice expansions that depend on the alkyl chain length, very similar to the MX2-n-alkylamine systems described above. This raises the fundamental question whether protonated amines are the actual intercalated species in both the cases, involving reduction of the host. In fact, this constitutes the basis of the new model for the intercalation reaction in MX2 proposed by Schollhorn (1980). 

Reduction of imines cleavage of oximes.1 Na2S204 in aqueous DMF reduces imines to N-alkylamines at 110°. Yields are 40-73% (five examples). Carbonyl compounds are regenerated from oximes by cleavage with aqueous Na2S204 at 25°. Yields are 54-96% (four examples). 

The lipids used in the syntheses of neoglycolipids are often commercially available most of the long-chain carboxylic acids, n-alcanols, n-alcanethiols or n-alkylamines are readily available as well as a.co-dicarboxylic acids, diols or diamines useful for the syntheses of bola-amphiphiles. 

Wszolek, P. C. Alexander, M. (1979). Effect of desorption rate on the biodegradation of n-alkylamines bound to clay. Journal of Agricultural and Food Chemistry, 27, 410—14. 

The first benzazetidine (243) was isolated from the photolysis of 3-phenyldihydroben-zotriazine (242) (66JA1580). Another route to benzazetidines involving formation of the N to aryl-C bond utilizes intramolecular nucleophilic substitution via aryne (287). It is not general, however, and is only satisfactory when R1 and/or R2 are alkoxy groups. The reaction also fails for N-alkylamines (78LA608). 

Korenman, I. M., N. Y. Gurevich, and T. G. Kulagina, Extraction of Certain n-Alkylamines from Aqueous Solutions. Zh. Prikl. Khim. (J. Appl. Chem. USSR), 1973 46EE, 726-728. 

Aube and co-workers have found that enolizable ketones react with benzyl azide in triflic acid to yield /V-(phenylamino)-methylated products [Eq. (5.354)]. The transformation is an aza-Mannich reaction interpreted with the involvement of the Mannich reagent A -phenyl iminium ion 295 formed in situ in a Schmidt rearrangement. Cyclic tertiary alcohols react with alkyl azides in triflic acid to yield N-alkylamines (296, 297)983 [Eq. (5.355)]. The Schmidt rearrangement was used to transform Merrifield resin into amino-polystyrene resin by reacting the azido derivative in excess triflic acid (CH2CI2, 0°C).984... 

Secondary amines.1 Aminosilanes react with primary alkyl halides in the presence of sodium methoxide to form N-alkylamines in 45-85% yield (equation I). 

N-ALKYLAMINES Mercury(II) nitrate. Methoxyamine. Sodium methoxide. 

As soon as the first SMA was prepared, the question arose as to the structure and consequently of the basicity of this new type of amine. As is true for N-alkylamines, it could be expected that the silylmethyl group would make MSMA more basic than ammonia through its +1 effect. Conversely, the ability of a silicon atom to accept electrons from a nucleophile, as is the case with silatranes and o-silylbenzylamines,20... 

To tune the physical and chemical properties of [(NH4)4n Mg4(L10)6 ] (29a), the direct method was extended by the exchange method (Scheme 11) [104]. Addition of an excess of n-alkylamines R3-NH2 leads to replacement of the... 

Quite striking extrema are observed in the dependence of apparent partial molar heat capacities on salt concentration for alkylammonium salts and related compounds, e.g. Bu4N+ octanoate, and these can be understood in terms of long-range hydrophobic interactions (Leduc and Desnoyers, 1973). However, the properties of n-alkylamine hydrobromides have indicated that there are still... 

ZSM-5 like alkanolamine diamine mono-n-alkylamine alcohols and ammonia alcohols template-free NHgQ Q OH propylamine C,Ho0H 4 (13-15) (16) (17-19) (20) (21) (22,23)... 

To draw conclusions concerning the templating effect of different molecules, comparable conditions for the crystallization process must be used. In this paper we present a systematic investigation on the effect of mono-, di- and tri-n-alkylamine and tetraalkylammonium compounds (alkyl = C. - C,) upon the rate of crystallization, yield and the properties of the products. Also the field of a template-free synthesis is studied. The products were characterized by magic-angle-spinning nuclear magnetic resonance spectroscopy (MAS NMR) and X-ray diffraction. 

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