AN ALUMINUM SILOXIDE COMPLEX FOR STEREOSELECTIVE POLYMERIZATION OF RACEMIC LACTIDE

作者：Zhang, Yu; Pang, Xuan; Ma, Lili; Tang, Zhaohui^*

来源：JOURNAL OF THE CHILEAN CHEMICAL SOCIETY, 2017, 62(2): 3468-3471.

DOI：10.4067/S0717-97072017000200009

• aluminum siloxide
• catalyst
• lactide
• stereoselective
• polymerization

Stereoselective polymerization of lactide is receiving growing attention in polymer science. Herein, a five-coordinate aluminum siloxide complex, [2,2-dimethyl1,3- 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. H-1 NMR and C-13 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 degrees C, and polymerized rac-lactide to crystalline polymer (Tm = 178 degrees C). This is the first report of stereoselective polymerization of rac-lactide using aluminum siloxide as a catalyst.

• 出版日期2017-6
• 单位中国科学院大学; 中国科学院长春应用化学研究所