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

Table 3

Substrate scope in the thiocyanation reaction of arenes using KSCN/SESA/H₂O₂ under room temperature.

Entry	Substrate (a)	Product (b)	SESA (1 mol%)		Citric acid (10 mol%) [38]		m.p [found]; m.p [lit.]
			Time (min)	Yield^a %	Time (min)^b; Our time	Yield %^b; Our yield^c
1			2	97	20; 40	91; 90	68–70; 72-73 [35]
2			10	96	20; 40	82; 80	77–79; 79–81 [35]
3			3	98	7; 15	88; 78	92–95; 97–99 [35]
4			—	—	—	—	—
5			10	98	25; 45	85; 83	130–132; 125–127 [36]
6			2	98	—	—	79–81
7			8	97	60; 80	65; 45^d	90–92; 74–76 [36]
8			40	78	45; 70	83; 79	66–68; 66–69 [36]
9			35	81	40; 65	79; 74	80–82; 77–80 [35]
10			40	96	60; 100	79; 73	75–80; 82–84 [35]
11			35	94	60; 90	75; 59	69–71; 71-72 [35]

aIsolated yield.
^bLiterature results.
^cOur results for this experiment.
^dOnly conversion is 45% for this entry.