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在彻底考察了对乙二醇具有活性的催化剂以后,开发的重点集中到了两个新发现的催化剂体系方面。加入相当量松散的三烷基膦,如三异丙基膦,就可显著提高羰基铑催化剂的活性及稳定性。高压红外研究表明,与膦分子配位的单核氢化物—羰基铑络合物起着重要的作用。膦的另一种类型,包括直链的烷基膦和芳基膦,抑制了这一反应。它们容易引起铑转化为惰性膦—羰基金属簇阴离子。加入一定数量的胺会更加促进这一反应。此外,它
After a thorough examination of catalysts that are active on ethylene glycol, development has focused on two newly discovered catalyst systems. The addition of a significant amount of a trialkylphosphine, such as triisopropylphosphine, can significantly increase the activity and stability of the rhodium carbonyl catalyst. High-pressure IR studies have shown that the mononuclear hydride complex coordinated with the phosphine molecule, rhodium carbonyl rhodium, plays an important role. Another type of phosphine, including linear alkyl phosphines and aryl phosphines, suppresses this reaction. They easily lead to the conversion of rhodium to an inert phosphine-metal carbonyl cluster anion. Adding a certain amount of amine will further promote this reaction. In addition, it