Benzyloxycalix[8]arene: a new valuable support for NHC palladium complexes in C–C Suzuki–Miyaura couplings
作者:Ibrahim Abdellah、Pauline Kasongo、Axel Labattut、Régis Guillot、Emmanuelle Schulz、Cyril Martini、Vincent Huc
DOI:10.1039/c8dt02550a
日期:——
Benzyloxycalix[8]arene supported catalysts bearing N-heterocyclic carbene palladium complexes on each subunit were readily synthesized. Intermediates and catalysts were fully characterized, allowing for a fine control of their structure. X-ray diffraction analysis confirmed the formation of a calix[8]arene bearing eight well-defined NHC palladium complexes. The macrocyclic structure of calix[8]arenes allowed
易于合成在每个亚基上带有N-杂环卡宾钯配合物的苄氧基杯[8]芳烃负载的催化剂。中间体和催化剂已得到充分表征,可以对其结构进行精细控制。X射线衍射分析证实形成了带有八种明确定义的NHC钯配合物的杯[8]芳烃。杯[8]芳烃的大环结构允许在均相条件下进行可扩展且无色谱的催化剂合成,而催化反应仅通过改变溶剂的性质即可在非均相条件下进行。的确,当用作乙醇的悬浮液时,可以通过一大批C–C Suzuki–Miyaura偶联官能化的溴化底物获得较高的TON和TOF,而简单过滤后的金属污染较低。