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Mono-, pseudo-gem, and pseudo-para ethynylcyclophanes and bis(azides) have been employed as addition partners in CuAAC reactions to design and build complex extended molecular scaffolds. The reactivity of the resulting triazoles was investigated under photochemical conditions. A variety of newly substituted [2.2]paracyclophanes were identified; deazotization of pseudo-gem and pseudo-para adducts provided indolophane derivatives. An intramolecular stabilization effect was observed in the case of pseudo-gem derivatives. A photochemical rearrangement from a pseudo-para adduct to a pseudo-ortho product was identified.
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http://dx.doi.org/10.1002/chem.201701593 | DOI Listing |
Nat Commun
April 2025
Engineering Research Centre of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, 430079, Wuhan, Hubei, P. R. China.
Planar chiral [2,2]paracyclophanes (PCPs) are widely used in materials science and asymmetric syntheses. Therefore, synthetic and material chemists have focused on the efficient and selective construction of planar chiral PCPs for decades. Herein, we present a photoinduced cobalt-catalyzed desymmetric addition of pseudo-para-diformyl and pseudo-gem-diformyl PCP, enabling the synthesis of planar chiral PCP alcohols with both planar and central chiralities.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
April 2025
Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, P. R. China.
Planar chiral [2.2]paracyclophanes, particularly pseudo-disubstituted derivatives, are privileged scaffolds for chiral ligands and catalysts in asymmetric synthesis and have widespread applications in materials science. However, catalytic asymmetric approaches for the enantioselective synthesis of pseudo-disubstituted [2.
View Article and Find Full Text PDFNat Commun
April 2024
Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 43, Prague, 2, Czech Republic.
Planar chiral [2.2]paracyclophanes consist of two functionalized benzene rings connected by two ethylene bridges. These organic compounds have a wide range of applications in asymmetric synthesis, as both ligands and catalysts, and in materials science, as polymers, energy materials and dyes.
View Article and Find Full Text PDFChemistry
September 2017
Institute of Organic Chemistry, Technical University of Braunschweig, Hagenring 30, 38106, Braunschweig, Germany.
Mono-, pseudo-gem, and pseudo-para ethynylcyclophanes and bis(azides) have been employed as addition partners in CuAAC reactions to design and build complex extended molecular scaffolds. The reactivity of the resulting triazoles was investigated under photochemical conditions. A variety of newly substituted [2.
View Article and Find Full Text PDFChemistry
March 2011
Steacie Institute for Molecular Sciences, National Research Council (Canada), Ottawa, ON, Canada.
The first study of pseudo-bimolecular cycloaddition reaction dynamics in the gas phase is presented. We used femtosecond time-resolved photoelectron spectroscopy (TRPES) to study the [2+2] photocycloaddition in the model system pseudo-gem-divinyl[2.2]paracyclophane.
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