Jc. Yuan et Sj. Lu, Regio- and stereoselective alternating copolymerization of alpha-olefins with carbon monoxide using a cationic palladium-chiral diphosphine catalyst, TETRAHEDR L, 42(24), 2001, pp. 4069-4073
Enantioselective alternating copolymerization of carbon monoxide with propy
lene, 1-heptene, 1-octene, and styrene was carried out using a palladium ca
talyst 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 1,1,1,3,3,3-he
xafluoro-2-propanol and reprecipitating with methanol. Optical rotation, el
emental analysis and H-1, C-13 NMR and IR spectra showed that our copolymer
s were optically active and isotactic with an alternating poly(l,4-ketone)
structure. (C) 2001 Elsevier Science Ltd. All rights reserved.