Antibacterial and antifouling oxathiazines and their oxides

Abstract

Use of 3-aryl-5,6-dihydro-1,4,2-oxathiazines and their oxides having the formula ##STR1## wherein n is 0, 1 or 2; R.sup.1 is hydrogen, C.sub.1-4 alkyl or benzyl; and R represents (a) phenyl; phenyl substituted with 1 to 3 substituents independently selected from hydroxyl, halo, C.sub.1-12 alkyl, C.sub.5-6 cycloalkyl, trihalomethyl, phenyl, C.sub.1-5 alkoxy, C.sub.1-5 alkylthio, tetrahydropyranyloxy, phenoxy, C.sub.1-4 alkylcarbonyl, phenylcarbonyl, C.sub.1-4 alkylsulfinyl, C.sub.1-4 alkylsulfonyl, carboxy or its alkali metal salt, C.sub.1-4 alkyloxycarbonyl, C.sub.1-4 alkylaminocarbonyl, phenylaminocarbonyl, tolylaminocarbonyl, morpholinocarbonyl, amino, nitro, cyano, dioxolanyl or C.sub.1-4 alkyloxyiminomethyl; naphthyl; pyridinyl; thienyl, preferably when n is not 2; furanyl; or thienyl or furanyl substituted with one to three substituents independently selected from C.sub.1-4 alkyl, C.sub.1-4 alkyloxy, C.sub.1-4 alkylthio, halo, cyano, formyl, acetyl, benzoyl, nitro, C.sub.1-4 alkyloxycarbonyl, phenyl, phenylaminocarbonyl and C.sub.1-4 alkyloxyiminomethyl; or R represents a radical of formula ##STR2## wherein X is oxygen or sulfur, Y is nitrogen, CH or C(C.sub.1-4 alkyloxy); and R' is hydrogen or C.sub.1-4 alkyl, as an antibacterial, anti-yeast, antifungal, algicidal, anticrustacean, molluscicidal and general antifouling agent and compositions containing the same.