Organocatalysis by site-isolated N-heterocyclic carbenes doped into the UIO-67 framework

详细信息    查看全文

• 作者：William T. Schumacher ; Madeleine J. Mathews ; Sean A. Larson ; Carl E. Lemmon ; Karin A. Campbell ; Brendan T. Crabb ; Brent J.-A. Chicoine ; Laurance G. Beauvais ; ^{lbeauvais@pointloma.edu" class="auth_mail" title="E-mail the corresponding author} ; Marc C. Perry ; ^{mperry1@pointloma.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Metal&ndash ; organic frameworks ; N-heterocyclic carbene ; Organocatalysis ; Transesterification ; Bromination
• 刊名：Polyhedron
• 出版年：2016
• 出版时间：16 August 2016
• 年：2016
• 卷：114
• 期：Complete
• 页码：422-427
• 全文大小：726 K

文摘

Two imidazolium-tagged biphenyldicarboxylates were synthesized and incorporated into the UiO-67 framework. Post synthetic exchange did not prove a useful route to these materials. Alternatively, mixed-linker synthesis of the solid afforded materials loaded with 6–7% imidazolium linker, corresponding to fewer than one active site per cage. Powder X-ray diffraction patterns for the doped metal–organic frameworks (MOFs) revealed that they were isostructural with UiO-67. Once activated, the N-heterocylic carbene (NHC) containing MOF was found to catalyze the transesterification of vinyl acetate with benzyl alcohol in good yield. The catalyst could be recycled with a modest drop in conversion. This is the first report of a NHC-doped MOF acting as an organocatalyst.