Chemoenzymatic synthesis of sucrose-containing aromatic polymers.
A chemoenzymatic approach was developed to prepare sucrose-containing aromatic polymers. The protease from Bacillus licheniformis catalyzed the transesterification of sucrose with a diester of terephthalic acid in pyridine to give the mono- and diester products. At 45 degrees C, >70% of sucrose was consumed after 1 day and sucrose diester began to form after 6 days when >95% of sucrose had been converted to sucrose monoester. The final yield of sucrose diester after 20 days was 13.8%. The sucrose monoester was identified as sucrose 1'-terephthalate and the diester products consisted of sucrose 6,1'-diterephthalate and sucrose 6',1'-diterephthalate in a ratio of 2:1. The sucrose diester products were polymerized with ethylene-glycol and ethylene-diamine to give poly(ethylene-terephthalate) and poly(ethylene-terephthalamide), with sucrose contained in the polymer backbone. The polycondensation reactions were carried out in dimethylsulfoxide (DMSO) at 70 degrees C using zinc acetate as a catalyst. The sucrose-containing polyester and polyamide were obtained at 65% yield for 24 h and at 73% yield for 12 h, respectively. End-group analysis of the polymers by (13)C-NMR or (1)H-NMR in DMSO provided a number average molecular weight of 3200 and 4300 Da, respectively. Structural analyses of the polymers were performed with (1)H-NMR, (13)C-NMR, and FTIR. On the basis of (13)C-NMR, acylation of the C1', C6, and C6' hydroxyls were maintained in the polymer backbones.
Park
H G
HG
Samsung Advanced Institute of Technology, Taejon, Korea.
Chang
H N
HN
Dordick
J S
JS
D001407:Bacillus / Q000201:enzymology; D001704:Biopolymers / Q000737:chemistry*; D010450:Endopeptidases / Q000378:metabolism; D006841:Hydrocarbons, Aromatic / Q000138:chemical synthesis; D009757:Nylons / Q000737:chemistry; D013395:Sucrose / Q000737:chemistry*
D001704:Biopolymers; D006841:Hydrocarbons, Aromatic; D009757:Nylons; D013395:Sucrose; D010450:Endopeptidases