The title comoounds were readily prepared in one-pot by phase-transfer reaction of a methanol adduct of 2-(z-methyl)-E- propene with acetamidine or benzamidine in the presence of aqueous sodium hydroxide in CH2C12. Various 5-trifluoromethyl- pyrimidines were also synthesized & ... OS the 4-fluorine of the title compounds. ... There is increasing interest in organic compounds bearing the trifluoromethyl group, because of their possible physiological activities as well ...