Results 11 to 20 of about 2,240,218 (271)
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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Aqueous Ti(IV)-Catalyzed Diels-Alder Reaction
Molecules, 2007 The aqueous Diels-Alder reaction of 1,3-cyclohexadiene with 1,4-benzoquinone was compared and contrasted to the same reaction catalyzed with Flextyl P™, a novel Ti(IV) performance catalyst.
Kyle E. Litz
doaj +2 more sources
An on-surface Diels-Alder reaction. [PDF]
Angew Chem Int Ed Engl, 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.
Castro-Esteban J +5 more
europepmc +6 more sources
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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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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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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Electrostatic catalysis of a Diels–Alder reaction [PDF]
Nature, 2016 It is often thought that the ability to control reaction rates with an applied electrical potential gradient is unique to redox systems. However, recent theoretical studies suggest that oriented electric fields could affect the outcomes of a range of chemical reactions, regardless of whether a redox system is involved.
Aragonès, A. +7 more
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Diels-Alder Reaction of β-Fluoro-β-nitrostyrenes with Cyclic Dienes [PDF]
, 2020 The Diels-Alder reaction of β-fluoro-β-nitrostyrenes with cyclic 1,3-dienes was investigated. A series of novel monofluorinated norbornenes was prepared in up to 97% yield.
Savva A., Ponomarev +7 more
core +1 more source
Tandem Diels—Alder/Ene Reactions. [PDF]
ChemInform, 2004 AbstractFor Abstract see ChemInform Abstract in Full Text.
Kraus, George, Kim, Junwon
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