Journal ArticleDOI
NMR studies of bridged ring systems: XIX—13C1H spin coupling and 13C chemical shift of the bridge methylene in benzonorbornene and benzonorbornadiene†
TLDR
In this paper, data on 13C chemical shifts and 13C1H spin coupling constants of norbornane (1), norbornene (2) and norbornadiene (3), benzonorbornen (4), and benzonorsorbornadienes (6) are reported.Abstract:
Data on 13C chemical shifts and 13C1H spin coupling constants of norbornane (1), norbornene (2), norbornadiene (3), benzonorbornene (4) and benzonorbornadiene (6) are reported. The non-equivalence in J(13CH) values determined from the two bridge methylene proton signals in 2,2,3,3-tetradeuteriobenzonorbornene (5) and 6 is briefly discussed. The extraordinary deshielding of the bridge methylene carbon in 6 has been noted.read more
Citations
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Journal ArticleDOI
13C, 1H spin–spin coupling. X—Norbornane: A reinvestigation of the karplus curve for 3J(13C, 1H)
Rafet Aydin,Harald Günther +1 more
TL;DR: In this paper, the effect of substitution by additional CC bonds in α-, β- and γ-positions of the 13C-αC-βC-γH bond fragment is elucidated.
Journal ArticleDOI
Synthesis of (±)-4-Demethoxydaunomycinone by Double Diels-Alder Additions to 2, 3, 5, 6-Tetramethylidene-7-oxanorbornane
Yvonne Bessiere,Pierre Vogel +1 more
TL;DR: In this paper, the authors present a new version of the LSA-1980-002 Record created on 2005-11-09, modified on 2017-05-12. Reference
Journal ArticleDOI
Interaction between Non-Conjugated Chromophores .14. Regioselectivity of the Diels-Alder Additions of 2-Substituted 5,6-Dimethylidenenorbornanes and Dimethylidenebicyclo[2.2.2]Octanes
TL;DR: Note: Univ lausanne,inst chim organ,ch-1005 laus Switzerland, switzerland.
Journal ArticleDOI
Substituierte Benzobenzvalene und Diazabenzobenzvalene – Synthesen aus Diels-Alder-Addukten des Benzvalens und NMR-Spektroskopie
Manfred Christl,Silke Freund +1 more
TL;DR: The Diels-Alder additions of benzvalene (4) to 3,5-dichloro-, 3,4-5-trichlor-α-pyrone give the δ-lactones 8−10, which eliminate carbon dioxide on heating to form the chloro-substituted 1,3-cyclohexadiene derivatives 11−13 as mentioned in this paper.
References
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Journal ArticleDOI
Analysis of the Nuclear, Magnetic Resonance Spectra of Norbornene Derivatives
Journal ArticleDOI
Angular Dependence of Long‐Range Proton Coupling Constants Across Four Bonds
TL;DR: In this paper, a theoretical treatment of long-range proton spin coupling constants, 4JHH′, across four bonds in saturated and unsaturated hydrocarbons, using the valence bond formalism, is presented.
Journal ArticleDOI
Carbon-13 chemical shifts of bicyclic compounds
TL;DR: In this article, the 13C NMR absorption spectra of 50 bicyclic hydrocarbons, alcohols and ketones have been measured, in addition to some terpenes.
Journal ArticleDOI
N.m.r. studies of bridged ring systems: ii. unusual magnetic deshielding effect on the bridge methylenes of norbornadiene and benzonorbornadiene
TL;DR: In this article, the proton magnetic resonance spectra of some norbornane derivatives having double bonds and (or) a benzene ring in the skeleton were studied and differences in the chemical shifts between the bridge meth were found.
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