Diphosphine compound, catalyst system containing diphosphine compound and application of diphosphine compound

The present invention provides a diphosphine compound, a catalyst system containing the same, and applications of the diphosphine compound, the diphosphine compound has a structure represented by a formula I or a formula II, a phosphorus atom and a benzene ring are connected through methylene, and a nitrogen-containing heteroaryl structure is matched, such that carbon monoxide can be easily activated after phosphorus and a metal are coordinated, and an alkoxy carbonylation reaction is facilitated. The catalyst system comprises a bimetallic catalyst and the diphosphine compound, and when the catalyst system is used for catalyzing conjugated olefin to prepare 1, 6-dicarboxylic ester compounds, the conversion rate of raw materials can be effectively improved, and the yield and regioselectivity of products are improved. 本发明提供一种双膦化合物、包含其的催化剂体系及其应用，所述双膦化合物具有如式I或式II所示结构，其中，磷原子与苯环之间以亚甲基相连，并配合含氮杂芳基结构，使磷与金属配位后更容易对一氧化碳进行活化，有助于发生烷氧基羰基化反应。所述催化剂体系包括双金属催化剂以及所述双膦化合物，该催化剂体系用于催化共轭烯烃制备1,6-二羧酸酯类化合物时，能够有效提高原料的转化率，并提高产品的收率以及区域选择性。