Table 2.

Reactivity of 2-nitroso benzoic acid derivatives towards sulfinic acids.

Entry	C-Nitroso compound			R3	RSO2−	Yield [%][a]
		R1	R2
1	7a	H	H	Me	1b	− (9a)
2	7b	H	H	Et	1b	− (9b)
3	7c	NO2	H	Me	1b	84 (9c)]
4	7c	NO2	H	Me	1a	88 (9d)
5	7d	H	CO2H	Me	1b	84 (9e)
6	7d	H	CO2H	Me	1a	89 (9f)
7	7d	H	CO2H	Me	1c	81 (9g)

^[a]Yields of isolated products after purification by silica gel chromatography. R for 1a–c as depicted in Figure 1.