Table 2.

PCB congeners prepared by the modified symmetrical Ullmann coupling reaction

Entry	Iodobenzene	PCB congener	Yield (%)	mpa,b [°C]
1	1a		No PCB 4 isolated
2	1b	3e (PCB 47)	24	37–39 (41–42)
3	1f	3i (PCB 54)	20	197–199.5 (197–198)
4	1g	3j (PCB 136)	52	109–110 (112–113.5)
5	1h	3k (PCB 153)	47	100–102 (102–103)
6	1i	3l (PCB 155)	47	111–112 (111–113)

^aValues in parenthesis are literature values (Bolgar et al., 1995);

^brecrystallized from methanol.