Development of a 4,4′-biphenyl/phosphine-based COF for the heterogeneous Pd-catalysed telomerisation of 1,3-butadiene
作者:Peter J. C. Hausoul、Tamara M. Eggenhuisen、Deepak Nand、Marc Baldus、Bert M. Weckhuysen、Robertus J. M. Klein Gebbink、Pieter C. A. Bruijnincx
DOI:10.1039/c3cy00188a
日期:——
The improved synthesis, characterisation and application of a microporous 4,4â²-biphenyl/phosphine-based covalent organic framework (COF) for the heterogeneous Pd-catalysed telomerisation of 1,3-butadiene with phenol and glycerol are presented. The solid polyphosphine is amorphous, microporous and an excellent support for Pd(acac)2. Solid-state NMR and DRIFT analysis of materials of varying Pd-loading show that bis-phosphine complexes of palladium are preferably formed. Under solvent- and base-free conditions, high conversions and selectivities are obtained for this catalyst material with both phenol and glycerol as substrates. The product selectivity, with both butenylation and telomerisation activity observed with phenol, can be tuned by variation of the metal loading. For glycerol it is shown that the selectivity to the undesired tri telomer is low under all applied conditions and, remarkably, that the heterogeneous catalyst outperforms its homogeneous PPh3-based counterpart.
本文介绍了一种微孔4,4′-联苯/膦基共价有机框架(COF)的改进合成、表征和应用,用于1,3-丁二烯与酚和甘油的Pd催化异构聚合反应。固态聚膦为无定形、微孔材料,是Pd(acac)2的优良支持体。对不同Pd负载材料的固态NMR和DRIFT分析表明,更倾向于形成双膦合金的钯络合物。在无溶剂和无碱条件下,当以酚和甘油作为底物时,这种催化材料产生了高转化率和选择性。通过改变金属负载量,可以调整酚在丁烯化和异构聚合反应中的产物选择性。对甘油来说,所有应用条件下,对非期望的三聚物的选择性都较低,而且值得注意的是,该异质催化剂的性能优于其均相PPh3基催化剂。