Regio- and stereoselective alternating copolymerization of α-olefins with carbon monoxide using a cationic palladium-chiral diphosphine catalyst

✍ Scribed by Jian-Chao Yuan; Shi-Jie Lu

• Publisher: Elsevier Science
• Year: 2001
• Tongue: French
• Weight: 116 KB
• Volume: 42
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(01)00633-5

✦ Synopsis

Enantioselective alternating copolymerization of carbon monoxide with propylene, 1-heptene, 1-octene, and styrene was carried out using a palladium catalyst modified by 1,4-3,6-dianhydro-2,5-dideoxy-2,5-bis(diphenylphosphino)-L-iditol (DDPPI). The pure poly(1,4-ketone)s were obtained by dissolving the copolymers containing spiroketal and 1,4-ketone units in 1,1,1,3,3,3hexafluoro-2-propanol and reprecipitating with methanol. Optical rotation, elemental analysis and 1 H, 13 C NMR and IR spectra showed that our copolymers were optically active and isotactic with an alternating poly(1,4-ketone) structure.