Table 1. Optimization of the formation of phosphonium salt 3a.

Entry	φ (mL min–1)	[1] (M)	[2a] (M)	V (mL)	T (°C)	Yield a (%)
1	0.25	0.12	0.12	5	110	8
2	0.125	0.12	0.12	5	110	15
3	0.125	0.19	0.19	5	110	21
4	0.1	0.19	0.19	15	110	25
5	0.1	0.19	0.19	20	110	54
6	0.1	0.38	0.38	20	110	74
7	0.1	0.74	0.74	20	110	92
8	0.1	0.74	0.74	20	120	96 (92)

^aNMR yields. Isolated yield between brackets.