Results 11 to 20 of about 77,395 (287)
Unusual Structure-Energy Correlations in Intramolecular Diels–Alder Reaction Transition States [PDF]
Molecules, 2014 Detailed analysis of calculated data from an experimental/computational study of intramolecular furan Diels–Alder reactions has led to the unusual discovery that the mean contraction of the newly forming C-C σ-bonds from the transition state to the ...
Justyna M. Żurek +3 more
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An on‐surface Diels–Alder reaction [PDF]
Angewandte Chemie International Edition, 2021 AbstractThe Diels–Alder reaction is one of the most popular reactions in organic chemistry. However, its use in the field of on‐surface synthesis is hampered by the spatial restrictions of this cycloaddition reaction. Herein we selected a cyclic strained triyne to demonstrate an on‐surface hexadehydro‐Diels–Alder reaction in a single molecule.
Jesús Castro‐Esteban +5 more
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Immobilized cyclopentadiene in the Diels Alder/retro-Diels Alder concept
ARKIVOC, 2003 Immobilized cyclopentadiene on polystyrene has been synthesized and studied in (4π + 2π)- cycloadditions with a variety of dienophiles. Reasonable to excellent conversions were obtained. The cyclopentadiene Diels-Alder adducts turned out to be generally too stable to allow effective cycloreversion both under dynamic (under vacuum) and static (in a ...
René G. Gieling, Antonius J. H. Klunder
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Origin of asynchronicity in Diels–Alder reactions [PDF]
Physical Chemistry Chemical Physics, 2021 Quantum chemical activation strain analyses reveal that asynchronicity in Diels–Alder reactions reduces both destabilizing Pauli repulsion as well as stabilizing orbital interactions, and occurs if the former dominates.
Pascal Vermeeren +2 more
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The hexadehydro-Diels–Alder reaction [PDF]
Nature, 2012 Arynes (aromatic systems containing, formally, a carbon-carbon triple bond) are among the most versatile of all reactive intermediates in organic chemistry. They can be 'trapped' to give products that are used as pharmaceuticals, agrochemicals, dyes, polymers and other fine chemicals.
Hoye, Thomas R. +4 more
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, 2023 Computational study on the catalytic control of endo/exo Diels-Alder reactions by cavity quantum vacuum ...
Angel Rubio +2 more
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DIELS-ALDER ADDITION OF BENZYNE TO N-SUBSTITUTED 2-PYRIDONES.
, 1971 DIELS-ALDER ADDITION OF BENZYNE TO N-SUBSTITUTED 2 ...
ERIC BENJAMIN. SHEININ (7996424)
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Intramolecular Imino Diels-Alder Reaction: Progress toward the Synthesis of Uncialamycin [PDF]
, 2009 We herein described an intramolecular imino Diels-Alder reaction promoted with BF3.OEt2/DDQ affording substituted quinolines. Using this procedure, we prepared the chiral quitioline moiety of the uncialamycin, a new enediyne natural ...
Pierre van de Weghe +5 more
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The pentadehydro-Diels–Alder reaction [PDF]
Nature, 2016 In the classic Diels-Alder [4 + 2] cycloaddition reaction, the overall degree of unsaturation (or oxidation state) of the 4π (diene) and 2π (dienophile) pairs of reactants dictates the oxidation state of the newly formed six-membered carbocycle. For example, in the classic Diels-Alder reaction, butadiene and ethylene combine to produce cyclohexene ...
Wang, Teng +3 more
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Artificial Enzymes for Diels‐Alder Reactions [PDF]
ChemBioChem, 2020 AbstractThe Diels‐Alder (DA) reaction is a cycloaddition of a conjugated diene and an alkene (dienophile) leading to the formation of a cyclohexene derivative through a concerted mechanism. As DA reactions generally proceed with a high degree of regio‐ and stereoselectivity, they are widely used in synthetic organic chemistry. Considering eco‐conscious
Ghattas, Wadih +3 more
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