Abstract: SYNTHESIS OF BIFUNCTIONAL EXTRACTANTS CONTAINING PHOSPHORUS AND SULFUL AND STUDIES ON EXTRACTING PROPERTESCHEN WENJUN; ZHU LIN; YANG YUANYOU; TANG SHIXIANG; ZHANG GUANGYU（Department of Chemistry，Sichuan Uniuersity，Chengdu 610064） ABSTRACT The nine products of diakyl-N，N-alkylsu1fidonakyl phonates，（R＇O）_2P（O）（CH_2）_n，SR″，have been synthesized and investigated on extractability for various hard and soft metal ions fromHCl and HNO_3 acid．The effect of substituting groups of extractant molecules are all studied. Theresults show that some soft and hard metal ions，e.g. Pd（Ⅱ）and U（Ⅵ） ， could be extractedeffectively，but for borderline metal ions，e.g. Rh（Ⅲ），couldn＇t be extracted．The primary factordetermining the extractability of these extractants is the number of carbon ions in alkyl group—（CH_2）_n—，the substitution of R＇and R″is only a less important factor. Key words Bifunctional extractant Extraction Hard and soft metal ions