insertion activity
2.The yields of PC for the two catalysts are 90 4% and 83 3%, respectively, after reaction at 140 ℃ for 3 h. Tert butyl substituted metal phthalocyanine shows higher catalytic activity than unsubstituted metal phthalocyanine because the homogeneous catalytic system resulted from more soluble ( t Bu) 4MPc is beneficial to the reaction and the increased charge density of ( t Bu) 4MPc caused by introducing tert butyl, an electron donor group, facilitates the insertion of CO 2 in cycloaddition.
