Table 2.

Scope of the palladium-catalyzed 1,2-diarylation of styrene derivatives and 1,3-dienes with organostannanes.

Entry	R1	R2	Product	Yield [%]a
1	p-MeC6H4	Ph (2a)	5a	78
2	p-MeC6H4	p-FC6H4 (2b)	5b	64
3	p-MeC6H4	p-MeOC6H4 (2c)	5c	65b
4	p-MeC6H4	m,m-(MeO)2C6H3 (2d)	5d	65
5	p-MeC6H4	p-CF3C6H4 (2e)	5e	68
6	p-MeOC6H4	Ph	5f	85
7	o-MeC6H4	Ph	5g	73
8	o-MeOC6H4	Ph	5h	73
9	p-MeC6H4		5i	57
10c		m,m-(MeO)2C6H3	5j	55
11c		p-FC6H4	5k	59
12d		p-FC6H4	5l	62
13d			5m	37

^aAverage yield of the isolated product in at least two experiments.

^bA 3:1 mixture of 1,2- and 1,1-diarylation products was formed.

^cThe reaction was performed at 45 °C.

^dThe reaction was performed at 40 °C.