【摘要】 本文研究了在钼(Ⅵ)螯合物催化下,用叔丁基氢过氧化物进行辛烯-1环氧化反应动力学。比较了不同配位基的钼(Ⅵ)螯合物催化性能的差异。配位基与钼(Ⅵ)的结合愈不牢固,反应速度常数愈大,而催化剂稳定性愈差。当存在过量给予体时,钼(Ⅵ)螯合物因解离受到抑制,则没有催化活性。如给予体适量,既可以保持催化剂的活性,又可增加催化剂的稳定性。更多还原

【Abstract】 The kinetics of epoxidation of 1-octene with tert-butyl hydroperox-ide, in the presence of various molybdenum ( Ⅵ ) chelates, has been investigated,and the difference of catalytic properies of various Mo(Ⅵ) chelates been compared.The weaker the bond between Mo ( Ⅵ ) and its ligands in the chelate, the greater the rate constants for Mo(Ⅵ) chelate-catalysed epoxidation, but the stability of the Mo ( Ⅵ ) chelate is not adequate in the epoxidation system. On addition of excessive amount of donor to the system, the dissociation of Mo (Ⅵ) chelate is so much restricted that the Mo (Ⅵ) chelate loses its catalystic activity. However, in the presence of adequate amount of the donor, the Mo (Ⅵ) chelate can not only maintain its catalytic activity, but also increase its stability in the system.更多还原