... Printed in Great Britain Pergamon Press plc EIGII umT#-!iELECTIVIN II TUB CELORIRATION OF PIIBNOLS UITB IF-1-1uBs IN TEE mtEsEIacB OF SILICA. Keith Smith* and Michael Butters Department of Chemistry, University College of Swansea. Swansea SA2 8PP. UK. Barry Nay New Reactions Branch, BP Research Centre, Chertsey Road, Sunbury-on-Thames, Middlesex TW16 TLN, UK. ...