The utility of various phosphonamide groups has been examined in the context of the carbanion-accelerated Claisen rearrangement (CACR). An extensive survey has identified the NJV'-dibenzyl-l, 3, 2-diazaphospholidine group 11 to be optimal in the ease of construction of the CACR precursors and the facility and stereoselectivity of the rearrangement. Using n-butyllithium as the base, the phosphonamides rearranged readily ...