6-Methyl-2H-1,3-oxazin-2,4(3H)dione-3-sulfohalides

摘要

3-Sulfohalides of 6-methyl-2H-1,3-oxazin-2,4(3H)-dione of the formula I <IMAGE> (I) in which X represents fluorine or chlorine are prepared by reacting fluorosulfonyl isocyanate or chlorosulfonyl isocyanate, at a temperature of from -35 DEG to +70 DEG C, optionally in the presence of an inert solvent, with diketene, acetoacetyl fluoride, acetoacetyl chloride, acetoacetic acid or an isopropenyl ester of the formula CH2=C(OOCR)-CH3 in which R represents an alkyl radical having from 1 to 4 carbon atoms, a substituted or unsubstituted phenyl or benzyl radical.