Zobrazeno 1 - 10
of 10
pro vyhledávání: '"John R. Penton"'
Autor:
Heinrich Zollinger, John R. Penton
Publikováno v:
Helvetica Chimica Acta. 64:1717-1727
The N-diazo coupling of p-chloroaniline with p-chlorobenzenediazonium tetrafluoroborate in acetonitrile at 30° shows non-linear base catalysis by water. The results are interpreted in terms of the SE2 mechanism with rate-limiting proton loss at low
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d6f5d99f16dc73b82489eb2da43d24bc
https://doi.org/10.1002/hlca.19810640602
https://doi.org/10.1002/hlca.19810640602
Publikováno v:
Helvetica Chimica Acta. 65:122-132
The rearrangements of 4′-methoxy-N-methyl- and N-methyl-4′-nitro-diatzoaminobenzene have been studied in 20% acetonitrile/aqueous buffers. The reactions are specifically acid catalyzed and involve pre-equilibrium formation of amine and diazonium
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::568263adb34afc4174f3ff2e8afcaf47
https://doi.org/10.1002/hlca.19820650112
https://doi.org/10.1002/hlca.19820650112
Autor:
John R. Penton, Heinrich Zollinger
Publikováno v:
Helvetica Chimica Acta. 64:1728-1738
In the title reactions it is shown that aminoazo formation does not occur by direct attack of diazonium ion at C-atom. Initial attack is at N-atom, but proton loss from the ωN-complex formed is relatively slow. Hence, at low amine concentration this
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8cc29428605e45b385ae057af13b312f
https://doi.org/10.1002/hlca.19810640603
https://doi.org/10.1002/hlca.19810640603
Publikováno v:
Helvetica Chimica Acta. 58:230-256
The nitration of pentamethylbenzene in nitromethane has been studied under conditions that allow two mechanisms of nitration to be distinguished. One has been identified as nitration via the nitronium ion; the other nitration involves an oxidation of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e391e4eee0d061be908d24e1e087426c
https://doi.org/10.1002/hlca.19750580131
https://doi.org/10.1002/hlca.19750580131
Publikováno v:
Helvetica Chimica Acta. 54:2043-2057
Nature and proportions of the products formed in the nitrations mentioned in the title are affected by the process of mixing. Pentamethylnitrobenzene, formed initially in the nitration of pentamethylbenzene, is attacked by a nitronium ion at a positi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2c9fb40954a08d4ead2390677fc02496
https://doi.org/10.1002/hlca.19710540735
https://doi.org/10.1002/hlca.19710540735
Publikováno v:
Chemischer Informationsdienst. 6
The nitration of pentamethylbenzene in nitromethane has been studied under conditions that allow two mechanisms of nitration to be distinguished. One has been identified as nitration via the nitronium ion; the other nitration involves an oxidation of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e5212c6e78d7f93a7f9daef7c540ef16
https://doi.org/10.1002/chin.197517178
https://doi.org/10.1002/chin.197517178
Autor:
Heinrich Zollinger, John R. Penton
Publikováno v:
Chemischer Informationsdienst. 13
In the title reactions it is shown that aminoazo formation does not occur by direct attack of diazonium ion at C-atom. Initial attack is at N-atom, but proton loss from the ωN-complex formed is relatively slow. Hence, at low amine concentration this
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4435ea2dc6704e9905b184190ecd6345
https://doi.org/10.1002/chin.198201154
https://doi.org/10.1002/chin.198201154
Autor:
John R. Penton, Heinrich Zollinger
Publikováno v:
Chemischer Informationsdienst. 13
The N-diazo coupling of p-chloroaniline with p-chlorobenzenediazonium tetrafluoroborate in acetonitrile at 30° shows non-linear base catalysis by water. The results are interpreted in terms of the SE2 mechanism with rate-limiting proton loss at low
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::178fed86b68bbd6279ca54011c2f09e5
https://doi.org/10.1002/chin.198201153
https://doi.org/10.1002/chin.198201153
Publikováno v:
Chemischer Informationsdienst. 3
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4b1370cd7db3dfe8dab0fab4c3b7f296
https://doi.org/10.1002/chin.197202093
https://doi.org/10.1002/chin.197202093
Autor:
Heinrich Zollinger, John R. Penton
Publikováno v:
Journal of the Chemical Society, Chemical Communications. :819
The increase in kinetic isotope effect with temperature in diazo coupling reactions of NN-dimethylaniline and 3-methylaniline is attributed to partitioning of aminoazobenzene formation between two reactions, both of which involve molecular complex fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::35824367a1f59d941ce133fbc4c62069
https://doi.org/10.1039/c39790000819
https://doi.org/10.1039/c39790000819