The pyrolysis method used previously to transform the acetyl derivatives of N,N-dimethyllactamide into , -dimethylacrylamide was applied to the preparation of other N-alkyl acrylamides and methacrylamides. N,N-Diethylacrylamide was obtained in good yield by the thermal decomposition of N,N-diethyl-a-acetoxypropionamide, but pyrolysis of N-methyl-and N,N-di-ro-butyl-acetoxypropionamide was less satisfactory for the preparation of the corresponding acrylamides.N-Methyl-and N,N-dimethylmethacrylamides were made successfully by pyrolyzing the corresponding N-alkyl -acetoxyisobutyramides. Apparently methacrylamides can be made more readily than acrylamides by the pyrolysis method.Philadelphia 18, Pennsylvania

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