N,A-Dimethylacetamide

Among the solvents suggested for azo coupling reactions, aside from aqueous and specialized nonaqueous systems as mentioned above, are mixtures of water with water-soluble alcohols (e.g., methanol, ethanol, propanol), other water-soluble solvents such as tetrahydrofuran, N, A-dimethylacetamide, iV,iV-dimethylformamide, and organic acids such as formic, acetic, and propionic acids [11 ]. 

Abbreviations DMF, A,A-dimethylformamide DMA, N,A-dimethylacetamide GC, gas chromatography HPLC, high-performance liquid chromatography NMR, nuclear magnetic resonance RCM, ring closing metathesis TFA, trifluoroacetic acid THF, tetrahydrofuran. 

Only resinous products and methyl 6-acetamidopyridine-3-carboxylate were obtained when methyl 6-aminopyridine-3-carboxylate was reacted with ethyl 2-acetoxyacetoacetate by heating in phosphorus pentoxide, methanesulfonic acid, or polyphosphoric acid in the absence or presence of a solvent such as toluene, xylene, or methylene chloride. However the desired methyl 3-acetoxy-2-methyl-4-oxo-4//-pyrido[ 1,2-a]pyrimidine-7-carboxylate 93 was obtained when the above components were reacted in N, A-dimethylacetamide in the presence of polyphosphoric acid at 100°C for 48 hours (84FES837). 

N,A -dimethylacetamide (DMAC) or dimethyl sulfoxide (DMSO) solutions by addition of water, because of their insensitivity to hydrolysis 200). 

The reaction RCOO +R l- RCOOR + I" has also been employed [211]. Quantitative results in less than 10 min under mild, non-acidic conditions are claimed for the conversion of any acidic compound to a primary alkyl ester when the tetramethylammonium salt is treated with the alkyl iodide in a highly polar solvent system such as anhydrous methanolic N, A -dimethylacetamide. 

Abbreviations ACN, acetonitrile, methyl cyanide PRN, propionitrile, ethyl cyanide DMF, AiALdimethylformamide DMA, N, A. -dimethylacetamide DEA diethylamine TEA, triethyl-amine Pyr, pyridine. 

Poly(vinylidene fluoride) A,A-dimethylacetamide/ethanol and water N, A-dimethylacetamide/poly (1 -vinyl-2-py nolidinone) and water 2003YEO 2003YEO... 

The [T ] value of a branched polymer is smaller than that of the corresponding linear polymer. The MHS equation of a segmented polyurethane, synthesised from methylenebis (4-phenyl isocyanate), polycaprolactone and 2-aminoethanol in N, A -dimethylacetamide shows upward curvature at Mw 10 owing to an increase in the degree of branching per molecule in the region of 10 [41]. Therefore, it should be noted that of the branched polymer cannot be unconditionally determined by using the MHS equation established for the linear polymer. 

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