NOVEL 3-AMINO-5-BROMO-2H-1,4-THIAZINES

New compounds of the formula OR IODO, R is hydrogen, alkyl, aryl, aralkyl, alkaryl, alkoxyaryl, haloaryl, nitroaryl, cycloalkyl, haloalkyl, nitro, halo, acetamido or lower alkyl carbethoxy, Y is hydrogen, alkarylsulfonyl, arylsulfonyl or and R1 is lower alkyl, lower haloalkyl, cycloalkyl, aryl, nitroaryl or haloaryl, are prepared in the novel cyclization reaction (i) comprising reacting a dinitrile of the formula NC-CH(R)-S-CH(R)-CN with at least three molar equivalents of HX at a temperature between about -50 DEG C. and about 50 DEG C., or in the reaction (ii) wherein the neutralized reaction product of (i) is further reacted with YX, or R2CNO and R2 is aryl or alkyl or in the reaction (iii) wherein the neutralized reaction product of (i) is further reacted with HBr and an aqueous alcohol solution at reflux temperature. The new compounds are useful as chemical intermediates or in neutralizing acids and as fungicides, herbicides and insecticides.