R. N.  Reddi, Malekar, P. V., and Sudalai, A., ?N-Heterocyclic carbene catalyzed regioselective oxo-acyloxylation of alkenes with aromatic aldehydes: a high yield synthesis of alpha-acyloxy ketones and esters?, Organic & Biomolecular Chemistry, vol. 11, no. 38, pp. 6477-6482, 2013.