Abstract: Under alkaline condition, 1, 2-diselenolane(1) was reduced by sodium borohydride into sodium 1, 3-propanediselenolate, then condensed with 1, 2-bis(2'-chloroethyloxy) benzene and diselenacrown ether, 2, 3-benzo-1, 4-dioxa-7, 11-diselenacyclotridecyl-2-ene(2)was obtained.The first diselenacrown ether platinum complex(3) was prepared by reacting compound(2) with potassium chloroplatinite, The influencing factors including the nature of substrate, the reaction temperature, the amount of the complex used and the reaction atmosphere on its catalytic activity for the hydrosilylation of olefins by triethoxysilanc were investigated.The experimental data indicated that diselenacrown ether platinum complex was an efficient catalyst for the hydrosilylation;as compared with monoselenacrown ether platinum complex, the former possessed higher catalytic activity for allyl phenyl ether and allyl glycidyl ether, but needed higher reaction temperature.

Key words: Diselenacrown ether, Platinum complex, Synthesis, Hydrosilylation catalyst