Cross coupling reactions of multiple CCl bonds of polychlorinated solvents with Grignard reagent using a pincer nickel complex
作者:Yashraj Gartia、Abhijit Biswas、Matthew Stadler、Udaya Bhasker Nasini、Anindya Ghosh
DOI:10.1016/j.molcata.2012.07.007
日期:2012.11
The nickel(II) complex of a bulky pincer-type ligand, N,N′-bis(2,6-diisopropylphenyl)-2,6-pyridinedicarboxamido, was examined for sp3–sp3 coupling of Grignard reagents with polychlorinated solvents. The nickel(II) complex catalyzed CC coupling of polychlorinated alkyl halides, such as dichloromethane (CH2Cl2), chloroform (CHCl3), and carbon tetrachloride (CCl4), with various Grignard reagents. The
检查了大钳形配体N,N'-双(2,6-二异丙基苯基)-2,6-吡啶二甲酰胺基的镍(II)配合物与多氯溶剂的格氏试剂的sp 3 –sp 3偶联。镍(II)络合物通过各种格氏试剂催化多氯代烷基卤化物(例如二氯甲烷(CH 2 Cl 2),氯仿(CHCl 3)和四氯化碳(CCl 4))的CC偶联。在环境反应条件下并在短时间内(20分钟)内进行了多个CCl键的有效活化。该催化剂显示出该反应类型迄今报道的最高活性,催化剂负载量低至0.4 mol%,周转频率(TOF)高达724 h-1。对于正在研究的所有多氯代溶剂,该催化剂均能够通过CC键形成取代所有氯原子。催化过程可能被证明是补救有毒多氯溶剂的有效方法,同时可产生合成和商业上重要的化学物质。