Studies of catalyzed reaction mechanism between co-polyether (THF/EO) and N-100 by NMR - Interaction and complex formation between reactants and catalysts


Autoria(s): Luo SG; Zhang JG; Tan HM; Dong HJ; Wu YJ; Pei FK
Data(s)

1997

Resumo

To elucidate the mechanism of the catalyzed reaction of co-polyether (EO/THF) with N-100, the interaction and complex formation between reactants and catalysts were investigated by means of NMR spectroscopy. It is shown that the resonance peak of isocyanate carbon splits into two parts when the solutions of N-100 and co-polyether were mixed. The disappearing of proton resonance peak of hydroxyl group in NMR spectra when dibutyltin dilaurate(DBTDL) were added to the copolyether(THF/EO) solution indicates the complex formation, This interaction appears to be a bonding of tin to the oxygen of hydroxyl and make the hydrogen of the hydroxyl group very mobile and active, then exchange with other protons, In the case of triphenyl bismuth(TPB), the high field shift and intensity enhancement of proton peak were observed, which suggest a nucleophilic attack of the bismuth to the hydroxyl hydrogen.

Identificador

http://ir.ciac.jl.cn/handle/322003/24085

http://www.irgrid.ac.cn/handle/1471x/156770

Idioma(s)

中文

Fonte

Luo SG;Zhang JG;Tan HM;Dong HJ;Wu YJ;Pei FK.Studies of catalyzed reaction mechanism between co-polyether (THF/EO) and N-100 by NMR - Interaction and complex formation between reactants and catalysts,CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,1997,18(8):1393-1397

Tipo

期刊论文