摘要
以二苯膦基为配体,PdCl2做为活性组份,制备了1,1'-双(二苯膦基)二茂铁二氯化钯(DPPF),1,2-双(二苯膦基)乙烷二氯化钯(DPPE),1,3-双(二苯膦基)丙烷二氯化钯(DPPPr),1,4-双(二苯膦基)丁烷二氯化钯(DPPB)4种催化剂.通过IR,1H-NMR,EA,TG等手段对催化剂结构和性质进行了表征.同时,对苯酚催化氧化羰基化合成碳酸二苯酯的催化体系和参数进行了比较,筛选出最佳催化条件为:在溶剂30 mL二氯甲烷体系中,添加无机助剂0.75 mmol CuCl2和有机助剂0.375 mmol苯醌(BQ)以及表面活性剂(2.5 g)正四丁基溴化铵,使用DPPF做催化剂;其反应总压为5 MPa(其中p(CO)∶p(O2)=93∶7)和反应温度100℃,反应3 h后转化数(TON)达到69.5 DPC mol/Pdmol'.
Four types of catalysts [ 1, 1 '-Bis (diphenylphosphino) ferrocene ] dichloropalladium ( DPPF), [ 1,2-Bis (diphenylphosphino) ethane ] dichloropalladium ( DPPE ), ( 1, 3-Bis (diphenylphosphino) propane ) palladium ( II ) chloride ( DPPPr), 1, 4-Bis (diphenylphosphino) butane-palladium (II) chloride ( DPPB ) were synthesized using diphenylphosphino as the ligand and PdC12 as the active component. The catalysts were characterized by different techniques including IR, 1H-NMR, EA and TG. In addition , the catalytic performance and reactive parameters of different catalysts were investigated in the oxidation of phenol to diphenyl carbonate. The optimized catalytic condi- tion was: 0.75 mmol inorganic additive CuC12, 0. 375 mmol organic additive benzoquinone (BQ), 2.5 g surface active agent tetrabutyl ammonium bromide, 30 mL dichloromethane as solvent and DPPF as catalyst. A high TON (69.5 DPC mol/Pd mol) was obtained under a total pressure of 5 MPa(Pco : Po2=93 : 7) at 100 ℃for 3 h.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2013年第2期124-130,共7页
Journal of Molecular Catalysis(China)
基金
国家自然科学重点基金项目(NO.20936003)
湖北省自然科学基金(NO.2010CDB1106)
武汉市科技攻关计划(NO.201210321106)