Catalytic systems with diesters, diethers, diketones and diol esters as the internal electronic donors are newly emerging Ziegler-Natta systems.

• 其中，以二醚类、二酮类和二醇酯类化合物为内给电子体的催化体系是近年发展起来的新型齐格勒－纳塔催化剂体系。