Reactivity patterns in cationic tricarbonyliron complexes: crystallographic proof of stereoselectivity in long range asymmetric induction in the 1,3/1 ',2 ' series

The analysis of patterns of regioselectivity in cyclohexadienyl complexes i llustrates the versatility and power of the iron-based methodology in react ion sequences that make multiple use of the metal to establish a series of chiral centres, The conversion of tricarbonyl(eta (4)-cyclohexadienone)iron (0) into the dimethyl malonate adduct 4, which contains two chiral centres at carbon besides the controlling chirality of the tricarbonyliron complex itself, provides an example of long-range asymmetric induction. The relativ e stereochemistry of the 1,3/1',2' product has been defined as S,S,R*,R*. C opyright (C) 2001 John Wiley & Sons, Ltd.