Table 2.

Bromination of phenol (13) under solvent-free PV-PTFE conditions.

Entry	Conditions	Product (% yield)a	Time (min)
1	Br2 (1.1 equiv)	4-bromophenol (14) (89)	10
2	Br2 (excess)	14 (86)	10
3	Br2 (2.2 equiv)	2,4-dibromophenol (15) (82)	30
4	Br2 (excess), closed system	15 (90)	30
5	Br2 (excess), open to air	(15) (41) + 2,4,6-tribromophenol (16) (46)	240
6	Br2 (excess), H2O	16 (91)	60

^aIsolated yields.