Study on Oligomerization of Phenyl Isocyanate Catalyzed by Bis(methylcyclopentadienyl)samarium Complex
来源期刊：JOURNAL OF RARE EARTHS2000年第3期
论文作者：YUAN Fu-Gen LI Lan-zhi SHEN Qi
Key words：rare earths; divalent samarium; methylcyclopentadienyl; phenyl isocyanate;
Abstract: The oligomerization of phenyl isocyanate catalyzed by divalent bis(methylcyclopentadienyl)samarium complex was studied. The initiating reaction and the effect of coordination environment around the samarium atom were mainly discussed. It is found that the initiation reaction has a great influence on the apparent catalytic activity. The oligomers can be split into two fractions. The methanol insoluble fraction is mainly composed of dimers, while the methanol soluble fraction is mainly composed of trimers. Neither SmI2 nor SmI2(hmpa)4 (hmpa＝hexamethylphosphoric triamide) shows catalytic activity for the oligomerization of phenyl isocyanate.
YUAN Fu-Gen1，LI Lan-zhi2，SHEN Qi2
(1.Department of Chemistry, Suzhou Railway Teachers College, Suzhou 215009, China;
2.Department of Chemistry, Suzhou University, Suzhou 215006, China)
Abstract:The oligomerization of phenyl isocyanate catalyzed by divalent bis(methylcyclopentadienyl)samarium complex was studied. The initiating reaction and the effect of coordination environment around the samarium atom were mainly discussed. It is found that the initiation reaction has a great influence on the apparent catalytic activity. The oligomers can be split into two fractions. The methanol insoluble fraction is mainly composed of dimers, while the methanol soluble fraction is mainly composed of trimers. Neither SmI2 nor SmI2(hmpa)4 (hmpa＝hexamethylphosphoric triamide) shows catalytic activity for the oligomerization of phenyl isocyanate.
Key words:rare earths; divalent samarium; methylcyclopentadienyl; phenyl isocyanate;
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