Variation of the Grignard reagents (conditions A and B).

Entry	RMgBr	R′	Yielda [%]
			A	B
1	MeMgBr	Ph	—	68
2		Ph	0	0
3		Ph	—	68
4		H	76	—
5		Ph	—	65
6		H	—	64
7		Ph	—	75
8		H	—	71
9	PhMgBr	Ph	11	64
10		H	17	65
11		Ph	—	77
12		H	22	82
13		nC6H13	<5	<5
14		Ph	—	42
15		Ph	0	0

^aIsolated yields; E/Z of products >50/1.