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Norbornadiene

About: Norbornadiene is a research topic. Over the lifetime, 2389 publications have been published within this topic receiving 38603 citations.


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Journal ArticleDOI
TL;DR: A series of new σ-aryl-palladium compounds have been prepared from the reaction of perhaloaryl Grignard or -lithium reagents and [CH3(C6H5)2P]2PdCl2 as discussed by the authors.

33 citations

Journal ArticleDOI
TL;DR: In this article, the singlet --> singlet excited state spectra of cyclohexene, 1,4-cyclohexadiene, norbornene, and bicyclo[2.1]-2,5-heptadiene were studied by electron impact at scattering angles from 5° to 80°, and impact energies of 30 and 50 eV.
Abstract: The excited electronic states of cyclohexene, 1,4-cyclohexadiene, norbornene (bicyclo[2.2.1]-2-heptene), and norbornadiene (bicyclo-[2.2.1]-2,5-heptadiene) have been studied by electron impact at scattering angles from 5° to 80°, and impact energies of 30 and 50 eV. Low-lying features with intensity maxima at 4.24 eV in cyclohexene and 4.10 eV in norbornene are identified as singlet --> triplet transitions. Similar features in the spectra of 1,4-cyclohexadiene and norbornadiene extending from 3.4 to 5.4 eV and 2.9 to 4.5 eV, respectively, are believed to result from superposition of two low-lying singlet --> triplet transitions in each molecule. In norbornadiene these features have estimated intensity maxima at 3.4 and 3.9 eV, while in 1,4-cyclohexadiene they appear to be more highly overlapped, yielding a single intensity maximum at 4.29 eV. The singlet --> singlet excited state spectra of these molecules are discussed from the point of view of a model in which ethylene units interact via through-bond and through-space effects. In each of these four molecules, transitions to several superexcited states are observed.

33 citations

Journal ArticleDOI
TL;DR: Les acidites en phase gazeuse de quelques alcenes et dienes mono-and bicycliques sont mesurees dans une etude modele de l'homoaromaticite anionique as mentioned in this paper.
Abstract: Les acidites en phase gazeuse de quelques alcenes et dienes mono- et bicycliques sont mesurees dans une etude modele de l'homoaromaticite anionique

33 citations

Journal ArticleDOI
TL;DR: The transition-metal-catalyzed [4 + 2 + 2] cycloadditions of norbornadienes, bicyclo[2.2]octa-2,5-diene, and benzobarrelene with 1,3-butadienis proceed in excellent yields using cobalt-based catalytic systems.
Abstract: The transition-metal-catalyzed [4 + 2 + 2] cycloadditions of norbornadienes, bicyclo[2.2.2]octa-2,5-diene, and benzobarrelene with 1,3-butadienes proceed in excellent yields using cobalt-based catalytic systems. Two key distinctions between these [4 + 2 + 2] cycloadditions and the corresponding transition-metal-catalyzed [2 + 2 +2] reactions of norbornadiene are the requirement of a bimetal catalytic system with a bisphosphine ligand for the former and exclusive regioselectivity in the [4 + 2 + 2] reaction of 2-substituted norbornadienes to produce 1-substituted adducts. These distinctions may indicate two distinct mechanisms for the [4 + 2 + 2] and [2 + 2 + 2] reactions.

33 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202316
202240
202133
202040
201930
201829