3-(5-ethoxy-4-chloro-2-fluorophenyl)-6-trifluoromethyl-2,4(1H,3H)-pyrimidinedione 、
硫酸二甲酯 以there is obtained 3-(5-ethoxy-4-chloro-2-fluorophenyl)-1-methyl-6 -trifluoromethyl-2,4(1H,3H)-pyrimidinedione, m.p. 118°-121° C.的产率得到3-(5-ethoxy-4-chloro-2-fluorophenyl)-1-methyl-6-trifluoromethyl-2,4(1H,3H)-pyrimidinedione