Abstract
A mixture of 50% aqueous H 3PO 2 and I 2 (in catalytic amount) in HOAc efficiently reduces aryl alkenes to the corresponding alkanes in high yield. Addition of acetic anhydride to the medium results in ring-acetylation (or N-acetylation in the case of amines). H 3PO 2 costs only one-fifth as much as hydriodic acid on a mole basis and one mole of H 3PO 2 produces four moles of HI, resulting in a 20-fold cost advantage for H 3PO 2/I 2 over aqueous HI as a source of HI.
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