高分子学报
高分子學報
고분자학보
ACTA POLYMERICA SINICA
2001年
3期
399-402
,共4页
阳离子钯催化剂%手性配体%对映体选择性交替共聚%全同共聚物%光学活性
暘離子鈀催化劑%手性配體%對映體選擇性交替共聚%全同共聚物%光學活性
양리자파최화제%수성배체%대영체선택성교체공취%전동공취물%광학활성
Enantioselective alternating copolymerization of carbon monoxide with 1-heptene was carried out using palladium catalyst modified by 1,4-3,6-dianhydro-2,5-dideoxy-2,5-bis(diphenylphosphino)-L-iditol (DDPPI). The chiral diphosphine was proved to be effective at enantioselective copolymerization. The pure poly(1,4-ketone) was obtained by dissolving the copolymer containing spiroketal and 1,4-ketone units in 1,1,1,3,3,3-hexafluoro-2-propanol and reprecipitating with methanol. Optical rotation, elemental analysis, spectra of 1H-NMR, 13C-NMR and IR showed that our copolymer was optically active, isotatic, alternating poly(1,4-ketone) structure. The copolymerization was carried out at 45℃ for 48?h. Molecular weight: Mn=4.02×103, Mw/Mn=1.55 (GPC measurements with polystyrene standards). Optical rotation:［α］20589=+63° (CH2Cl2, 5.0?mg/mL). Tm=194℃, Tg=11℃.
