1500 g 17 5 moles were reacted to give 1307 g of a condensation product after removal by distillation of methanol and excess diamine analysis of this residue by nmr indicated it to be a mixture of substituted propionamides ii and iii str10 part of the condensation product 1210 g was pyrolyzed at 200 u00b0 to 220 u00b0 c under 45 mm hg pressure the pyrolysis product 1026 g was collected at 135 u00b0 u00b1 5 u00b0 c fractionation of 761 g of this material provided the following distillation cuts ______________________________________fraction b p u00b0 c pressure mm g ______________________________________1 55 8 3 912 58 75 3 1043 75 86 3 404 86 105 4 395 105 113 4 426 113 119 4 547 119 120 4 458 115 120 4 28______________________________________ spectral analysis by ir and nnr indicated that these cuts are mixtures of 1 2 disubstituted tetrahydropyrimidine derivatives n methylaminopropyl methacrylamide and n aminopropyl n methyl methacrylamide and their michael condensation derivatives methacrylic acid 25 g 0 68 mole and isopropylaminoethylamine 68 g 0 28 mole were reacted at 175 u00b0 to 180 u00b0 c for 3 hours in a 250 ml 3 neck flask equipped with distillation means during the reaction approximately one equivalent of by product water was taken overhead the bottoms product was pyrolyzed as described in example 1 from the pyrolysis overhead product was recovered by distillation isopropylaminoethyl methacrylamide 22.