Highly Efficient Rh‐catalysts Immobilised by π‐π Stacking for the Asymmetric Hydroformylation of Norbornene under Continuous Flow Conditions
作者:Anton Cunillera、Carolina Blanco、Aitor Gual、Jakob Maximilian Marinkovic、Eduardo J. Garcia‐Suarez、Anders Riisager、Carmen Claver、Aurora Ruiz、Cyril Godard
DOI:10.1002/cctc.201900211
日期:2019.4.18
the asymmetric hydroformylation of norbornene providing similar performance in terms of both activity and selectivity compared to the non‐immobilised systems. The recyclability of the new heterogenised catalysts was studied in the target reaction in batch mode. Nevertheless, the recycling was unsuccessful due to catalyst leaching. When used under continuous flow mode, these catalysts revealed robust
描述了含呋喃糖主链的C1对称二亚磷酸酯配体在Rh催化的降冰片烯不对称加氢甲酰化反应中的应用。催化剂具有很高的活性,仅产生对映选择性的外-降冰片烷甲醛(ee)高达71%。考虑到这些有希望的结果,用with部分修饰了配体以完成将其固定在碳材料上。合成了带有新型pyr标记配体的相应Rh复合物,并将其固定在多壁碳纳米管(MWCNT),氧化石墨烯(rGO)和碳珠(CBs)上。该新型催化体系在降冰片烯的不对称加氢甲酰化反应中进行了测试,与非固定化体系相比,在活性和选择性方面均表现出相似的性能。在目标反应中以分批方式研究了新型多相催化剂的可回收性。然而,由于催化剂的浸出,回收没有成功。在连续流模式下使用时,这些催化剂表现出坚固性并提供更高的ee 比相应的同类系统。