Table 2. The asymmetric cyclopropanation of alkenes with t-BFDA by [Co(P2)] ^{a , b , c} .

^aCarried out in one-portion under N₂ with [olefin] = 0.20 M.

^bIsolated yields.

^cee of major (E)-diastereomer determined by chiral HPLC.

^dee determined upon derivatization.

^eResults in the parentheses were obtained for the reaction performed on a 1.0 mmol scale.

^fAbsolute configuration determined by X-ray diffraction as [1R,2S].

^g5 equiv. olefin.

^hee determined by chiral GC.

ⁱNeat condition.