Table 7. The competitive reaction of Grignard reagents.

Entry	R	k X/kH	Total yield (%) a
1	H (2j)	—	36
2	Cl (2p)	1.12	25
3	F (2o) b	0.68	34
4	Me (2q)	0.61	46
5	OMe (2r)	0.18	43

^aTotal yield of the products at 40 min.

^bDue to the difficulty in analysis, the competitive reaction with 2,4-dimethylphenylmagnesium bromide (2q) instead of 2j was performed to give k_F/k_Me = 1.12 and calculated with k_Me/k_H = 0.61.