Table 1.

Structures and yields of compounds 3b–p

Entry	Compound	β, γ-Unsaturated aldehyde	R	Yielda (%)
1	3b	2b	2-CH3	51
2	3c	2c	3-CH3	90
3	3d	2d	4-CH3	70
4	3e	2e	2-CH3O	49
5	3f	2f	3-CH3O	68
6	3g	2g	4-CH3O	60
7	3h	2h	2-F	49
8	3i	2i	3-F	79
9	3j	2j	4-F	67
10	3k	2k	2-Cl	60
11	3l	2l	3-Cl	90
12	3m	2m	4-Cl	85
13	3n	2n	2-Br	65
14	3o	2o	3-Br	85
15	3p	2p	4-Br	74

^aIsolated yield.