Abstract
Liquid - phase methylation of 2-methylthio-4-pyrimidone (4), 6-methyl-2-methylthio-4-pyrimidone (5) and 6-methyl-3-methylthio-1,2,4-triazine-5-one (6) with MeOH over HY-Zeolite selectively gave 1-methyl-2-methylthio-4-pyrimidone (7), 1,6-dimethyl-2-methylthio- 4-pyrimidone (9) and 2,6-dimethyl- 3-methylthio- 1,2,4-triazine-5-one (11), respectively.