Screening of the reaction time of monoallylation of 2 using 10 wt% WO₃/ZrO₂^a.

Reaction time (h)	Conversion of 2b (%)	Yield of 3b (%)	Yield of 4b (%)	Selectivityc (%)
2	22	14	0	66
4	32	25	0	79
8	57	48	2	85
24	78	71	7	91
48	87	70	10	80

^aThe base reaction conditions are as follows: 1 (2.0 mmol), 2 (1.0 mmol), 10 wt% WO₃/ZrO₂ (100 mg), n-octane (0.25 mL), 140 °C, 500 rpm, 4.0 h.

^bDetermined by GC analysis based on 2, the yields are the average of the results of three experiments.

^cSelectivity = (yield of 3)/(conversion of 2) × 100 (%).