Table 1.

Structures of heterocyclic intermediates used in dye syntheses. Heterocycles (A) are lepidines (3, 10 and 11); or (B) are indolenines (4, 6, 8 and 12); benzothiazole (5); benzoxazole (7); and quinaldine (9). Intermediates 11 and 12 contain carboxylic acid functional groups.

Intermediate	Het	X	Y	R
3	A	H	---	C4H8SO3-
4	B	H	CMe2	C4H8SO3-
5	B	H	S	C4H8SO3-
6	B	SO3K	CMe2	C4H8SO3-
7	B	H	O	C4H8SO3-
8	B	SO3K	CMe2	C2H5
9	B	OMe	CH=CH	C4H8SO3-
10	A	OMe	---	C4H8SO3-
11	A	H	---	C5H10CO2H
12	B	SO3K	CMe2	C5H10CO2H