An Acetone-derived Chiral Stabilised Azomethine Ylid: Synthesis of Enantiomerically Pure 5,5,-Dimethylproline Derivatives - Aldous, David J; Drew, Michael G B; Hamelin, Estelle M -N; Harwood, Laurence M; Jahans, Archie B; Thurairatnam, Sukanthini (Synlett, 2001)