Radical cations of phenyl-substituted aziridines: what are the conditions for ring opening?

Gaebert C, Mattay J, Toubartz M, Steenken S, Muller B, Bally T (2005)
CHEMISTRY-A EUROPEAN JOURNAL 11(4): 1294-1304.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
Download
Es wurde kein Volltext hochgeladen. Nur Publikationsnachweis!
Autor/in
; ; ; ; ;
Abstract / Bemerkung
Radical cations were generated from different phenyl-substituted aziridines by pulse radiolysis in aqueous solution containing T1OH(.+), N-3(.) or SO4.- as oxidants or in n-butyl chloride, by Co-60 gamma radiolysis in Freon matrices at 77 K, and in some cases by flash photolysis in aqueous solution. Depending on the substitution pattern of the aziridines, two different types of radical cations are formed: if the N atom carries a phenyl ring, the aziridine appears to retain its structure after oxidation and the resulting radical cation shows an intense band at 440-480 nm, similar to that of the radical cation of dimethylaniline. Conversely, if the N atom carries an alkyl substituent while a phenyl ring is attached to a C-atom of the aziridine, oxidation results in spontaneous ring opening to yield azomethine ylide radical cations which have broad absorptions in the 500-800 nm range. In aqueous solution the two types of radical cations are quenched by O-2 with different rates, whereas in n-butyl chloride, the ring-closed aziridine radical cations are not quenchable by O-2. The results of quantum chemical calculations confirm the assignment of these species and allow to rationalize the different effects that phenyl rings have if they are attached in different positions of aziridines. In the pulse radiolysis experiments in aqueous solution, the primary oxidants can also be observed, whereas in n-butyl chloride a transient at 325 nm remains unidentified. In the laser flash experiments, both types of radical cations were also observed.
Stichworte
azomethine ylides; matrix isolation; radical ions; reaction mechanisms; density functional calculations
Erscheinungsjahr
2005
Zeitschriftentitel
CHEMISTRY-A EUROPEAN JOURNAL
Band
11
Ausgabe
4
Seite(n)
1294-1304
ISSN
0947-6539
eISSN
1521-3765
Page URI
https://pub.uni-bielefeld.de/record/1604962

Zitieren

Gaebert C, Mattay J, Toubartz M, Steenken S, Muller B, Bally T. Radical cations of phenyl-substituted aziridines: what are the conditions for ring opening? CHEMISTRY-A EUROPEAN JOURNAL. 2005;11(4):1294-1304.
Gaebert, C., Mattay, J., Toubartz, M., Steenken, S., Muller, B., & Bally, T. (2005). Radical cations of phenyl-substituted aziridines: what are the conditions for ring opening? CHEMISTRY-A EUROPEAN JOURNAL, 11(4), 1294-1304. doi:10.1002/chem.200400557
Gaebert, C., Mattay, J., Toubartz, M., Steenken, S., Muller, B., and Bally, T. (2005). Radical cations of phenyl-substituted aziridines: what are the conditions for ring opening? CHEMISTRY-A EUROPEAN JOURNAL 11, 1294-1304.
Gaebert, C., et al., 2005. Radical cations of phenyl-substituted aziridines: what are the conditions for ring opening? CHEMISTRY-A EUROPEAN JOURNAL, 11(4), p 1294-1304.
C. Gaebert, et al., “Radical cations of phenyl-substituted aziridines: what are the conditions for ring opening?”, CHEMISTRY-A EUROPEAN JOURNAL, vol. 11, 2005, pp. 1294-1304.
Gaebert, C., Mattay, J., Toubartz, M., Steenken, S., Muller, B., Bally, T.: Radical cations of phenyl-substituted aziridines: what are the conditions for ring opening? CHEMISTRY-A EUROPEAN JOURNAL. 11, 1294-1304 (2005).
Gaebert, C, Mattay, Jochen, Toubartz, M, Steenken, S, Muller, B, and Bally, T. “Radical cations of phenyl-substituted aziridines: what are the conditions for ring opening?”. CHEMISTRY-A EUROPEAN JOURNAL 11.4 (2005): 1294-1304.

Export

Markieren/ Markierung löschen
Markierte Publikationen

Open Data PUB

Web of Science

Dieser Datensatz im Web of Science®

Quellen

PMID: 15635685
PubMed | Europe PMC

Suchen in

Google Scholar