Dialkylammonium salts

A new class of compounds able to form lamellar structures consisting of bilayers separated by water-layers are dialkylammonium-salts of 2-[((trifluormethyl)-phenyl)-amino]-benzoic acid (Flufenamic acid) as was found by Eckert and Fischer 80). 

A general preparation of 2-acetonyl-2,4,6-triaryl-2//-thiopyrans 58 was discovered in the reaction of corresponding 2,4,6-triarylthiopyrylium perchlorates with ethanolic acetone catalyzed with various dialkylammonium salts (86GEP235455, 86JPR573). This preparative procedure was successfully extended to cyclohexane- and cyclopentane- 1,2-diones as the carbonyl components (89JPR853 90GEP280324). The action of bases on thiopyrylium salts may caused their dimerization to thiopyranyl derivatives under suitable conditions (89KGS479). 

A crystalline sample of this supramolecular assembly was irradiated with UV light and the formation of the corresponding cyclobutane 91 with syn-anti-syn stereochemistry was observed. In contrast, the photodimerisation of trans-stilbenoid-bis(dialkylammonium) salts does not take place in the absence of the macro cycle, indicating the importance of pre-organizing the stilbenoid units (which requires the presence of the anion) for this solid-state reaction to occur. 

In the foregoing sections, the rate-enhancing effect of alkylammonium micelles has been extensively described. Similar effects can be expected for bilayer membranes of dialkylammonium salts. In addition, specific catalytic processes may be realized in this new system by taking advantage of the peculiar membrane structure. For example, catalyst molecules which are anisotropically bound to the membrane may act in very specific manners, and the liquid-crystalline nature of the bilayer membrane should provide unique microenvironments for catalysis. These are particularly interesting in relation to the mode of action of membrane-bound enzymes. 

Publication of reports on the formation of well-characterized SUVs from long-chain dialkylammonium salts [300, 301] has prompted the syntheses of... 

Pseudorotaxanes and Rotaxanes Incorporating Macrocyclic Polyethers and Secondary Dialkylammonium Salts as their Components... 

Extracted polymer material had an IR spectrum identical with an authentic sample of polyfmethacrylic acid). They also report data on Mw (85.000 in 0.002 M HC1) and tacticity of the polyfmethacrylic acid) obtained. On the basis of Kunitake s fundamental investigation of vesicle forming dialkylammonium salts 14) similar results were reported recently by J. E. Brady u2). 

A reaction specific for mono- and dialkylammonium salts of N-unsubstituted tetrazoles 231 is interaction with formaldehyde under mild conditions and leading to iV-aminomethyltetrazoles 258 and 259 (Equation 41) <2000H(53)1421, 1997RJ0524>. 

Saturated l,3-diselenolane-2-iminium salts (168) can be prepared in high yield (85%, R = —(CH2)4—) from JV,JV-dialkylaminocarbodiselenoic acid (V,lV-dialkylammonium salts (167) by reaction with 1,1,2-tribromoethane (Equation (15)) <93USP5237067>. 

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