Development of a solid-phase ?asymmetric resin-capture?release? process: application of an ephedrine chiral resin in an approach to ?-butyrolactonesElectronic supplementary information (ESI) available: Additional experimental and characterisation data, 1H and 13C NMR for new compounds, 1H NMR for literature compounds, general chiral GC conditions, chiral GC traces for lactone products and FTIR spectra of resins. See http://www.rsc.org/suppdata/ob/b4/b408836k/