Porphyrins as Photoredox Catalysts: Experimental and Theoretical Studies
作者:Katarzyna Rybicka-Jasińska、Wenqian Shan、Katarzyna Zawada、Karl M. Kadish、Dorota Gryko
DOI:10.1021/jacs.6b09036
日期:2016.11.30
only are vital in biological systems but also are valuable catalysts in organic synthesis. On the other hand, catalytic properties of free base porphyrins have been less explored. They are mostly known as efficient photosensitizers for the generation of singlet oxygen via photoinduced energytransfer processes, but under light irradiation, they can also participate in electrontransfer processes. Indeed
Photocatalytic Reaction of Diazo Compounds with Aldehydes
作者:K. Rybicka-Jasińska、Ł. W. Ciszewski、D. Gryko
DOI:10.1002/adsc.201600084
日期:2016.5.19
Photocatalytic reactions of diazoacetates with aldehydes led to α‐alkylated carbonyl compounds instead of the expected cyclopropane derivatives. The reaction requires a dual catalytic system – photocatalysis merged with enamine‐iminium catalysis. NMR, EPR, UV/Vis, and ESI‐MS analyses provided sufficient data to corroborate the proposed radical mechanism – enamine catalysis merged with photocatalysis
Reticular chemistry allows the control of crystalline frameworks at atomic precision according to the predesigned topological structures. However, only a limited number of topological structures of three-dimensional (3D) covalentorganicframeworks (COFs) have been established. In this work, we developed a series of 3D COFs with an unprecedented she topology, which were constructed with D3d- and D4h-symmetric
网状化学允许根据预先设计的拓扑结构以原子精度控制晶体框架。然而,仅建立了有限数量的三维 (3D) 共价有机框架 (COF) 的拓扑结构。在这项工作中,我们开发了一系列具有前所未有的she拓扑的 3D COF,它们是用D 3d和D 4h对称构建块构建的。生成的 COF 在Im 3̅ m的空间群中结晶,其中每个D 3d单元与六个D 4h连接单元以形成具有2.0 nm的均匀孔径的非互穿网络。此外,这些COFs表现出高结晶度、优异的孔隙率以及良好的化学和热稳定性。这些网络的晶体结构、组成和物理化学性质得到了明确的表征。值得注意的是,内置的卟啉单元使这些 COF 成为光氧化还原 C-C 键形成和光催化二氧化碳还原反应的有效催化剂。因此,这项工作构成了构建 3D she -net COF 的新方法,也增强了 COF 的结构多样性和复杂性。
DESLONGCHAMPS, PIERRE;BELANGER, ANDRE;BERNEY, DANIEL J. F.;BORSCHBERG, HA+, CAN. J. CHEM., 68,(1990) N, C. 127-152
作者:DESLONGCHAMPS, PIERRE、BELANGER, ANDRE、BERNEY, DANIEL J. F.、BORSCHBERG, HA+
DOI:——
日期:——
The total synthesis of (+)-ryanodol. Part II. Model studies for rings B and C of (+)-anhydroryanodol. Preparation of a key pentacyclic intermediate
作者:Pierre Deslongchamps、André Bélanger、Daniel J. F. Berney、Hans-Juerg Borschberg、Robert Brousseau、Alain Doutheau、Robert Durand、Hajime Katayama、Richard Lapalme、Dominique M. Leturc、Chun-Chen Liao、Frederick N. MacLachlan、Jean-Pierre Maffrand、Fabrizio Marazza、Robert Martino、Claude Moreau、Luc Ruest、Louiselle Saint-Laurent、Roger Saintonge、Pierre Soucy
DOI:10.1139/v90-022
日期:1990.1.1
This paper reports several model studies that were necessary for the rational conception of a simple four-step synthesis (6 + (S)-74 → 81a–b → 83 87 → 89) (Scheme 11) of the carbonate derivative 8...