Asymmetric pinacol-type rearrangement of α-hydroxy methanesulfonates promoted by triethylaluminum — preparation of optically pure α-aryl and α-vinyl ketones —
Asymmetric (stereospecific) pinacol-type rearrangement of aryl or vinyl group in α-hydroxy methanesulfonates is promoted by Et3Al in CH2Cl2 at −78°C to afford optically pure α-aryl or α-vinyl ketones.