中文摘要：

以溴化季铵盐为催化剂，通过苯乙烯的环氧化和CO2的加成反应一步直接合成出苯乙烯环状碳酸酯，详细考察了催化剂的用量、氧化剂的种类、反应温度、反应时间和CO2压力等因素对反应主产物收率的影响．结果表明，以溴化四丁铵为催化剂，于80℃和1MPaCO2下反应6h，环状碳酸酯的收率达到38％，这是季铵盐阳离子和亲核性阴离子协同催化的结果．

英文摘要：

This paper reports a novel and convenient synthetic route to styrene carbonate from styrene and CO2 catalyzed by quaternary ammonium（phosphonium） salts, which avoids the isolation of intermediate epoxide. This route involves two sequential reactions ： epoxidation of styrene and cycloaddition of CO2 to epoxide. With tetrabutylammonium bromide as the catalyst, oxidants have a strong effect on the carbonate yield. The influences of reaction temperature, reaction time, CO2 pressure and catalyst amount are studied in detail. Under mild reaction conditions （80℃, 6 h, CO2 pressure 1 MPa）, the yield of styrene carbonate can be increased to 38% with TBAB without any organic solvent. Moreover, the synergistic effect of bulky ammonium cation and moderate nucleophilicity of anion results in its good performance in the one-pot synthesis of styrene carbonate.