| abstract |
Novel 3,7-disubstituted phenothiazinium salts are active in the photochemical disinfection of aqueous effluents. The novel salts are of the general formula <IMAGE> I wherein: either R1 is a saccharide residue; R2 is alkyl, cycloalkyl, aryl, aralkyl or heterocyclyl, any alkyl or alkylene chain being optionally interrupted by one or more heteroatoms, and Y is alkylene optionally substituted by alkyl, cycloalkyl, aryl or aralkyl; or R1 and R2 are each methyl and Y is a bond; and when R1 is a saccharide residue X is an anion selected from halogen, R3CO2-, R3SO3- and R3OSO3-, wherein R3 is alkyl, cycloalkyl, aryl, aralkyl or heterocyclyl, and when R1 and R2 are each methyl, X is an anion selected from R3SO3-, R3OSO3- wherein R3 is as defined above and R4CO2-, wherein R4 is an aldose or ketose residue, an N-protected alpha -amino acid residue or a omega -carboxy- alpha -amino acid residue. |