Jcp. Hopman et al., CHIRALITY PRESERVATION IN PYRROLINONE IRON TETRACARBONYL COMPLEXES - A ROUTE TO ENANTIOPURE 5-SUBSTITUTED PYRROLINONES, Journal of the Chemical Society, Chemical Communications, (6), 1995, pp. 617-618
The enantiopure iron complex 4 reacts under the influence of BF3 . OEt
(2) with allylsilanes and enol acetates through a cationic intermediat
e in which the chirality of 4 is preserved, yielding enantiopure 5-sub
stituted 3-pyrrolin-2-ones.