Studies of Catalyzed Reaction Mechanism Between Co-polyether (THF/EO) and N-100 by NMR (Ⅰ)──Interaction and Complex Formation Between Reactants and Catalysts

Abstract

Abstract: 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 in-vestigated by means of NMRspectroscopy. 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 NMRspectra when dibutyltin di-laurate(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 enhance-ment of proton peak were observed, which suggest a nucleophilic attack of the bismuth to the hydroxyl hydrogen.

Key words: Polymer complex, Co-polyether (THF/EO), Dibutyltin dilaurate, Catalysis mechanism, NMR spectroscopy

CLC Number:

O631.2

TrendMD:

LUO Shan-Guo, ZHANG Jian-Guo, TAN Hui-Min, DONG Han-Jiang, WU Yi-Jie, PEI Feng-Kui . Studies of Catalyzed Reaction Mechanism Between Co-polyether (THF/EO) and N-100 by NMR (Ⅰ)──Interaction and Complex Formation Between Reactants and Catalysts[J]. Chem. J. Chinese Universities, 1997, 18(8): 1393.

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Studies of Catalyzed Reaction Mechanism Between Co-polyether (THF/EO) and N-100 by NMR (Ⅰ)──Interaction and Complex Formation Between Reactants and Catalysts

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