1-Substituted 4-methoxy-5, 5-dimethyl-2-imidazolidinethiones have been prepared by reaction of Nl-(2-chloro-2-methylpropy1idene) amines with potassium thiocyanate in methanol under reflux. The 1-substituted 4-methoxy-5, 5-dimethyl-2-imidazolidinethiones were conveniently converted into the corresponding 1-substituted 5, 5-di-methyl-2- imidazolidinethiones by lithium aluminum hydride treatment in ethereal medium. The ...