Acetylation of Phenols, Anilines, and Thiols Using Silica Sulfuric Acid under Solvent-Free Conditions

Table 4

Acylation of phenols, amines, and thiols using Ac₂O in the presence of SSA under solvent-free conditions at room temperature.

Entry	Substrate	Product^a	Time (min)	Yield (%)
1			2	90
2			2	99
3			10	90
4			10	80
5			3	98
6			2	95
7			4	95
8			6	80
9			12	90
10			10	95
11			2	95
12			2	90
13			5	80
14			10	95
15			1	98
16			3	98
17			12	90
18			1	96
19			6	98
20			15	90
21			0.5	95
22			2	95
23			10	80
24			2	95
25			7	70

aAll products were known [34–37].