Since its introduction in 1972, the Ireland protocol'has remained preeminent among the numerous methods for effecting Claisen rearrangements? The utility of this procedure stems largely from the availability of 0-silyl ketene acetals, prepared from allyl ester or lactone enolates, and the facility of their rearrangement to silyl esters. We became interested in the possibility of replacing the trialkylsilyl group of 0-silyl ketene acetals with other groups, ...