Zobrazeno 1 - 10
of 14
pro vyhledávání: '"A. W. Zwaard"'
Autor:
A. W. Zwaard, H. Kloosterziel
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 100:126-128
The reaction of some 7-substituted cycloheptatrienes with KNH2 in liquid ammonia is described. In several cases stable carbanions are formed. Their NMR spectra are consistent with a non-planar pentadienyl-like structure. A comparison of the 1H-NMR sp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ef338802d21b4dc96c1eb32ce682069c
https://doi.org/10.1002/recl.19811000312
https://doi.org/10.1002/recl.19811000312
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 103:174-176
In basic alcohol, 7-(methoxycarbonyl)-1,3,5-cycloheptatriene (7b) forms its 2-, 3- and 1-isomers (viz.2b, 3b and 1b) in successive reactions. All isomers show specific hydrogen exchange in CD3ONa/CD3OD. For 3- and 1-(methoxycarbonyl)-1,3,5-cyclohepta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8fa853668a1c71fe575b13af80ab6af7
https://doi.org/10.1002/recl.19841030506
https://doi.org/10.1002/recl.19841030506
Autor:
A. W. Zwaard, J. C. M. Mossink
Publikováno v:
SPIE Proceedings.
Classification schemes to identify laser hazards may give a quick insight into the hazards of radiation. However the most serious accidents involve exposure to high voltages. Besides toxic chemicals may present hazards in laser work stations. In this
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9d8ddd17dedb347e6d63f8c0897d8342
https://doi.org/10.1117/12.150539
https://doi.org/10.1117/12.150539
Publikováno v:
Recueil des travaux chimiques des Pays-Bas = Journal of the Royal Netherlands Chemical Society, 101, 137-141. Royal Netherlands Chemical Society
Semi-empirical calculations (mostly MINDO/3) have been performed on singlet C7H7−. A preference for planar structures is evident from the calculations. Two different structures (an allylic structure and a pentadienylic structure, respectively) are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6afac7a658513a9898dbad50f8722bfd
https://doi.org/10.1002/recl.19821010402
https://doi.org/10.1002/recl.19821010402
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 101:187-191
Coalescence phenomena have been observed in the NMR spectra of a variety of 7-substituted 1,3,5-cycloheptatrienes upon varying temperature and/or solvent. Using two different methods, the energy of activation of the process responsible for coalescenc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31216762677282f34deb37d2064d850f
https://doi.org/10.1002/recl.19821010507
https://doi.org/10.1002/recl.19821010507
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 103:188-192
Under the influence of basic alcohol, 7-phenyl-1,3,5-cycloheptatriene (7c) forms its 1-, 2- and 3-isomers (viz.1c, 2c and 3c) in parallel reactions, contrary to suggestions made in the literature. The activation parameters for these reactions are giv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::171efa7e5238549f4e21940d73e87165
https://doi.org/10.1002/recl.19841030602
https://doi.org/10.1002/recl.19841030602
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 102:285-290
Modified Forsen-Hoffman experiments (in the FT mode) show that, in 7-substituted cyclohepta-1,3,5-trienes benzenesulphonyl groups migrate in a random way, while phenylthio substituents show a specific 1,2-migration. Activation parameters for the migr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3c1feba276fb08c6ee1046b09450de2e
https://doi.org/10.1002/recl.19831020601
https://doi.org/10.1002/recl.19831020601
Publikováno v:
Chemischer Informationsdienst. 14
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b353991f4cc09ca31d43a0851a5e08e9
https://doi.org/10.1002/chin.198338114
https://doi.org/10.1002/chin.198338114
Autor:
A. W. Zwaard, H. Kloosterziel
Publikováno v:
Chemischer Informationsdienst. 12
The reaction of some 7-substituted cycloheptatrienes with KNH2 in liquid ammonia is described. In several cases stable carbanions are formed. Their NMR spectra are consistent with a non-planar pentadienyl-like structure. A comparison of the 1H-NMR sp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3e3bd0bf98006cd8bfe31fad8adc45a7
https://doi.org/10.1002/chin.198125184
https://doi.org/10.1002/chin.198125184
Publikováno v:
Chemischer Informationsdienst. 13
Coalescence phenomena have been observed in the NMR spectra of a variety of 7-substituted 1,3,5-cycloheptatrienes upon varying temperature and/or solvent. Using two different methods, the energy of activation of the process responsible for coalescenc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9740aa7a694c32f839590e50ebc49509
https://doi.org/10.1002/chin.198236052
https://doi.org/10.1002/chin.198236052