Methylation of 4-phenyl-1,2,3-thiadiazole. Reaction of nucleophiles with N-methyl-1,2,3-thiadiazolium salts and the crystal structure of the products

The methylation of 4-phenyl-1,2,3-thiadiazole yields both N-methylated products. These react differently with nucleophiles. The structure of the product of the reaction with morpholine has been determined through X-ray diffraction analysis.