Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/36221
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Synthesis, structure (NMR and mass spectrometry) and conformational analysis of heterocyclic analogues of dibenzo[a,e]cycloocta-1,5-diene: 5,6,12,13-tetrahydrobispyrazolo [1,2-a:1',2'-e][1,2,5,6] tetraazocinediium dihalides |
Autor: | Cabildo, Pilar; Claramunt, Rosa M.; Cornago, Pilar; Lavandera, José Luis; Sanz, Dionisia CSIC; Jagerovic, Nadine CSIC ORCID ; Jimeno, M. Luisa CSIC ORCID; Elguero, José CSIC ORCID; Gilles, Isabelle; Aubagnac, Jean-Louis | Fecha de publicación: | 1996 | Editor: | Royal Society of Chemistry (UK) | Citación: | Journal Cover:J. Chem. Soc., Perkin Trans. 2, 1996, 701-711 Journal of the Chemical Society, Perkin Transactions 2 (4) : 701-711 (1996) | Resumen: | Several 5,6,12,13-tetrahydrobispyrazolo[1,2-a:1′,2′-e][1,2,5,6] tetraazocinediium dihalides 4a–d and 8 are prepared from pyrazole, 3,5-dimethylpyrazole, 4-(1-adamantyl)pyrazole and campho[2,3-c]pyrazole by stepwise alkylation with 1,2-dibromoethane or 1,2-dichloroethane. Their structural characterization has been achieved by NMR and mass spectrometry. Dynamic NMR spectroscopy allowed the measurement of the barrier for the chair–chair interconversion in the case of the parent compound 4a and the 1,3,8,10-tetramethyl derivative 4b. These barriers as well as the preferred chair conformation are rationalized through semi-empirical and molecular mechanics calculations with regard to dibenzo[a,e]cycloocta-1,5-diene. The study of doubly charged bispyrazolium salts allows demonstration of their reduction by addition of a hydride ion [C+++ H–→(C + H)+] during FABMS experiments. | Versión del editor: | http://dx.doi.org/10.1039/P29960000701 | URI: | http://hdl.handle.net/10261/36221 | DOI: | 10.1039/P29960000701 | ISSN: | 0300-9580 |
Aparece en las colecciones: | (CENQUIOR) Artículos |
Mostrar el registro completo
CORE Recommender
SCOPUSTM
Citations
21
checked on 21-abr-2024
WEB OF SCIENCETM
Citations
23
checked on 26-feb-2024
Page view(s)
364
checked on 24-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.