Regioselective Thiocyanation of Aromatic and Heteroaromatic Compounds Using [2-(Sulfooxy)ethyl]sulfamic Acid as an Efficient, Recyclable Organocatalyst and Novel Difunctional Brønsted Acid

Table 1

Optimization amounts of SESA, H₂O₂, and KSCN in water : ethanol (1 : 4, 5 mL).

Entry	SESA %	H2O2 (mmol)	KSCN (mmol)	Time (min)	Yield %
1	—	3	3	12 (h)	—
2	1	3	4	10	92
3	3	3	3	30	90
4	1	4	3	2	97
5	5	3	3	10	93
6	5	2	3	50	65
7	5	4	3	10	88
8	10	3	4	20	92
9	10	3	3	15	91
10	15	3	3	10	90
11	5	2	3	60	55
12	5	3	2	5 (h)	60
13	5	—	—	24 (h)	—