1. Department of Chemistry, Joseph Black Building, The University of Glasgow, Glasgow, G12 8QQ, U.K., INEOS Chlor Ltd., Runcorn Technical Centre, The Heath, Runcorn, Cheshire WA7 4QD, ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, and Huntsman Polyurethanes, Everslaan 45, B3078 Everberg, Belgium