Table 2.

Palladium‐catalyzed iodination of aryl and vinyl carboxylic acids.^[a]

[a] Reaction conditions: vinyl carboxylic acid (0.25 mmol), 1‐iodobutane (2, 0.275 mmol), Pd₂(dba)₃ (5 mol %), Xantphos (10 mol %), 1,8‐bis(dimethylamino)naphthalene (proton sponge, 0.275 mmol), 1‐(chloro‐1‐pyrrolidinylmethylene)pyrrolidinium hexafluorophosphate (PyCIU, 0.35 mmol), toluene (2.5 mL), 120 °C, 16 h. [b] GC yield using n‐dodecane as internal standard. [c] Starting from benzoyl chloride (0.25 mmol) without PyCIU and proton sponge.