私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

相關鏈接
聯系方式
  • 通信地址:加拿大魁北克省蒙特利爾
  • 郵編:無
  • 電話:(514) 848-2424 ext.5611
  • 傳真:
  • Email:zhibin.ye@concordia.ca
當前位置:> 首頁 > 論文著作 > 正文
Hyperbranched polyethylenes encapsulating self-supported palladium (II) species as efficient and recyclable catalysts for Heck reaction
作者:P. Liu, Z. Ye*, W.-J. Wang*, B.-G. Li
關鍵字:無
論文來源:期刊
具體來源:Macromolecules
發表時間:2013年
We demonstrate in this paper a unique self-supporting strategy for the synthesis of hyperbranched polyethylenes (HBPEs) encapsulating Pd(II) species as efficient and recyclable catalysts for Heck reaction. This strategy combines remarkably the synthesis of HBPE polymer support and the immobilization of Pd(II) species in situ in one pot. It is achieved by chain walking copolymerization of ethylene with an acrylate comonomer (2) containing a disulfide functionality with a cationic Pd(II)–diimine catalyst (1). The copolymerization renders successfully HBPEs containing pendant disulfide groups at a controllable content, while with no poisoning effect from the disulfide functionality. Meanwhile, the Pd(II) catalyst in situ immobilizes itself onto the polymers by coordinative binding with the pendant disulfide groups, giving rise to the homogeneous self-supported Pd(II) catalysts. The resulting Pd-containing HBPEs having a low content of 2 (ca. < 1 mol %) have been found to be efficient and recyclable catalysts for the Heck reaction of iodobenzene and n-butyl acrylate while with a low/minimum Pd leaching (to form catalytically active species) during the reaction/recycling. In particular, the convenient recovery and reuse of the catalysts while at maintained high catalytic performance has been demonstrated with the use of a biphasic solvent system comprised of N,N-dimethylformamide and n-heptane in the Heck reaction.
主站蜘蛛池模板: 梧州市| 永新县| 华亭县| 湾仔区| 体育| 齐河县| 宁远县| 宁晋县| 大丰市| 海城市| 武清区| 呼和浩特市| 遂宁市| 辽源市| 阿尔山市| 固阳县| 铜陵市| 布拖县| 房产| 罗甸县| 彰化市| 思茅市| 都匀市| 海门市| 云浮市| 云梦县| 兰西县| 长寿区| 益阳市| 双鸭山市| 建德市| 广西| 聂拉木县| 岢岚县| 台北市| 江津市| 武强县| 江城| 乡城县| 宜黄县| 达尔|