Zobrazeno 1 - 10
of 93
pro vyhledávání: '"Wallach rearrangement"'
Autor:
Yu. A. Mikheev
Publikováno v:
Russian Journal of Physical Chemistry A. 95:1803-1810
Intermediates of the transformation of azoxybenzene (AzOB) to hydroxyazobenzene isomers in concentrated sulfuric acid (the Wallach rearrangement) are found. It is considered that the charged nitrogen of the N+ → O− azo group induces electronic po
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f3e5a282a6d4c9f29d8cfe49e0f956a3
https://doi.org/10.1134/s0036024421090168
https://doi.org/10.1134/s0036024421090168
Akademický článek
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Publikováno v:
Tetrahedron. 69:10893-10905
The Wallach rearrangement was used as a method for preparing p-hydroxyazobenzocrown ethers starting from different azoxybenzocrowns as substrates. Synthesis of a series of p-hydroxyazobenzocrowns under modified conditions and characterization of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e0a4bd60d58fb998e46c1d39be722b5f
https://doi.org/10.1016/j.tet.2013.10.074
https://doi.org/10.1016/j.tet.2013.10.074
Publikováno v:
Canadian Journal of Chemistry. 87:1127-1134
Kinetic studies of the Wallach rearrangements of four azoxypyridines, four azoxypyridine N-oxides, and one azoxypyridine N-methiodide have been carried out in the 100% H2SO4acidity region. For all of the β-isomers in the study the reactions proceede
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8e499bbd2ff8baad61ac65213c58062b
https://doi.org/10.1139/v09-080
https://doi.org/10.1139/v09-080
Publikováno v:
Journal of Molecular Catalysis A: Chemical. 292:36-43
For the first time, the potential of acidic cation-exchange resin (sulfonated polystyrene) to catalyze the Wallach rearrangement of azoxybenzene into 4-hydroxyazobenzene has been proved. This finding reveals an alternative reaction path possible in a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b101a24aff2386487508db56289a3b48
https://doi.org/10.1016/j.molcata.2008.05.016
https://doi.org/10.1016/j.molcata.2008.05.016
Publikováno v:
Canadian Journal of Chemistry. 86:298-304
Extension of our studies of the generic Wallach rearrangement (of azoxybenzene to 4-hydroxyazobenzene) to the heteroaromatic series (azoxypyridines and axoxypyridine N-oxides) has revealed some dramatic reactivity differences, particularly for the α
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::84b72bbb4e701445bb415731bb794873
https://doi.org/10.1139/v08-016
https://doi.org/10.1139/v08-016
Akademický článek
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Publikováno v:
Canadian Journal of Chemistry. 81:535-541
Ab initio calculations have been performed on several different structures for the dicationic intermediate proposed for the Wallach rearrangement of aromatic azoxy compounds to hydroxy-substituted azo systems in strongly acidic media. For the unsubst
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::82137eec3353bba3751ed454d906861b
https://doi.org/10.1139/v03-049
https://doi.org/10.1139/v03-049
Publikováno v:
NIPPON KAGAKU KAISHI. :463-466
When the starting materials 4-acetyl-ONN- and -NNO-azoxybenzene(1α and 1β, respectively) were heated in 70/80% sulfuric acid, α/β isomerization and the Wallach rearrangement to 4-acetyl-4′-hydroxyazobenzene (2) were observed. However, neither t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::90b60f6d0049e7efc432953a274c175d
https://doi.org/10.1246/nikkashi.2002.463
https://doi.org/10.1246/nikkashi.2002.463
Publikováno v:
Journal of Molecular Catalysis A: Chemical. 160:429-435
Acidic zeolites HY and CaY catalyse the Wallach rearrangement of azoxybenzene ( I ) leading mainly to the formation of para -hydroxyazobenzene ( II ) and ortho -hydroxyazobenzene ( III ). In this transformation, increasing the loading level of I resu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::98a05ce54fde6b00890b0fa6fbfe9ee1
https://doi.org/10.1016/s1381-1169(00)00279-x
https://doi.org/10.1016/s1381-1169(00)00279-x