Journal of The Chilean Chemical Society | |
AN ALUMINUM SILOXIDE COMPLEX FOR STEREOSELECTIVE POLYMERIZATION OF RACEMIC LACTIDE | |
ZHANG, YU1  TANG, ZHAOHUI1  MA, LILI1  PANG, XUAN2  | |
[1] Chinese Academy of Sciences, Changchun, China;University of Chinese Academy of Sciences, Beijing, China | |
关键词: aluminum siloxide; catalyst; lactide; stereoselective; polymerization; | |
DOI : 10.4067/S0717-97072017000200009 | |
学科分类:化学(综合) | |
来源: Sociedad Chilena de Quimica | |
【 摘 要 】
Stereoselective polymerization of lactide is receiving growing attention in polymer science. Herein, a five-coordinate aluminum siloxide complex, [2,2-dimethyl-1,3-propylenebis(3,5-di-tert- butylsalicylideneiminato)] (triphenyl-silanolato) aluminium (III) (1), was prepared from AlEt3, N,N'-(2,2-dimethylpropylene) bis(3,5-di-tert-butylsalicylideneimine) and triphenyl-silanol. X-ray analysis demonstrated that 1 contained a five-coordinate aluminum atom with distorted trigonal bipyramidal geometry in the solid state. 1H NMR and 13C NMR spectra indicated that the two conformational stereoisomers of 1 tautomerizes rapidly in chloroform or toluene solution at room temperature. 1 showed high stereoselectivity (Pm = 0.84) for the ROP of rac-lactide in toluene at 100°C, and polymerized rac-lactide to crystalline polymer (Tm = 178°C). This is the first report of stereoselective polymerization of rac-lactide using aluminum siloxide as a catalyst.
【 授权许可】
Unknown
【 预 览 】
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