作者:Suhas Shahaji Gawali、Chidambaram Gunanathan
DOI:10.1016/j.jorganchem.2018.12.007
日期:2019.2
catalyzed the regioselective [2+2+2] cyclotrimerization of terminal aryl and alkyl alkynes to provide the 1,2,4-trisubstituted benzene molecules. Interestingly, internal alkynes also exhibited similar cyclization and resulted in hexa-substituted benzene compounds. Increased steric bulk on pincer ligands diminished the selectivity for cycloaddition. Cyclotrimerization reactions proceeded at room temperature
我们报告了简单的二(氨基甲基)吡啶连接的铁-钳配合物的合成和表征,它催化了末端芳基和烷基炔烃的区域选择性[2 + 2 + 2]环三聚反应,从而提供了1,2,4-三取代的苯分子。有趣的是,内部炔烃也表现出相似的环化作用,并产生六取代的苯化合物。钳位配体上增加的空间体积减少了对环加成反应的选择性。在通过格氏试剂活化催化剂后,在室温下进行环三聚反应。EPR研究表明,在催化剂中热诱导的自旋交叉效应。