Patent ID: 7022823

Claim:
A diazonium salt represented by the following general formula (1): wherein in general formula (1), R 1 represents a hydrogen atom, an alkyl group or an aryl group; R 2 represents an optionally substituted alkyl group or an optionally substituted aryl group; R 3 , R 4 , R 5 and R 6 each independently represent a hydrogen atom, an alkyl group, an aryl group, a halogen atom, an alkoxy group, an aryloxy group, an alkyl thio group, an aryl thio group, an acyl amino group, an alkoxy carbonyl group, a carbamoyl group, a cyano group, an alkyl sulfonyl group, an aryl sulfonyl group, a sulfamoyl group, a sulfonyl amino group or —N 2 + X − , and at least one of R 3 , R 4 , R 5 and R 6 represents —N 2 + X − , in which X − represents an anion.