Table 1. Optimization of the reaction conditions^a.

Entry	Catalyst	Solvent	Yield of 2 (%)
1	None	1,4-Dioxane	45
2	AlCl3	1,4-Dioxane	45
3	BF3 OEt2	1,4-Dioxane	45
4	HFIP	1,4-Dioxane	51
5	PFTB	1,4-Dioxane	63
6	PFTB	THF	51
7	PFTB	TBME	63
8	PFTB	CPME	84

^aReaction conditions: 1 (E/Z = 1 : 1, 0.1 mmol), Ph₃P⁺CF₂CO₂⁻ (2.0 equiv.), catalyst (10 mol%) in solvent (1.0 mL) at 50 °C under Ar for 12 h. ¹⁹F NMR yields with PhCF₃ as internal standard. 3–5 were not found. PFTB = Perfluoro-tert-butanol; CPME = Cyclopentyl methyl ether; HFIP = 1,1,1,3,3,3-Hexafluoroisopropanol.