Table 2. Scope of the Addition of Carboxylic Acids to Ethenesulfonyl Fluoride (ESF)^ab.

^aReaction condition: a mixture of carboxylic acid (1, 1.0 mmol), ESF (2.0 mmol), CuO (1.0 equiv), and MeCN (0.2 M, 5.0 mL) reacted at 80 °C under an argon atmosphere for 20 h.

^bIsolated yield.

^cThe reaction was conducted on a 5 mmol scale (1d, 1.00 g).

^dAdditional 5 mol % Ru(bpy)₃(PF₆)₂ was added.