Results 91 to 100 of about 317 (127)

Conical intersections and photoreactions of 2H-azirines

Chemical Physics, 2000
Abstract CASSCF calculations were performed on the nπ * - and ππ * -excited states of 2 H -azirine as well as some alkyl-substituted 2 H -azirines. An S 1 /S 0 conical intersection (CI) was located, through which a direct formation of nitrile ylide can occur.
Christian Bornemann, Martin Klessinger
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Thermal rearrangements of 2,3-diphenyl-2H-azirine

Journal of the Chemical Society, Perkin Transactions 1, 1973
Heating 2,3-diphenyl-2H-azirine in a sealed tube at 250 °C for 3 h yields 2-phenylindole, 2,3,4,5-tetraphenylpyrrole, 2,4,5-triphenylimidazole, and 1-benzyl-2,4,5-triphenylimidazole as major products, with tetraphenylpyrazine, tetraphenylpyrimidine, pentaphenylpyridine, benzonitrile, benzamide, and stilbene being produced in smaller yield.
John H. Bowie, Brian Nussey
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Photocycloaddition reactions of a bis-2H-azirine

Journal of the Chemical Society, Chemical Communications, 1977
Irradiation of 3,3′-(2,2′-biphenylene)bis-(2H)-azirine with electron-deficient dipolarophiles gives cycloadducts derived from a transient azabicyclo[3.1.0]hexene intermediate.
Albert Padwa, Hao Ku
openaire   +1 more source

Enantioselective addition of organolithium reagents to a 2H-azirine

Tetrahedron: Asymmetry, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
Erik Risberg, Peter Somfai
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Microwave spectrum of 3-methyl-2H-azirine

Journal of Molecular Structure, 1997
Abstract The microwave spectrum of 3-methyl-2H-azirine produced by pyrolyzing N -chloro-2-methylaziridine was observed. This new, unstable molecule was identified based on a comparison of observed molecular constants and those determined by an ab initio MO calculation. The rotational constants are A = 22338.04(4), B = 6618.622(9), and C = 5464.
Masaaki Sugie, Harutoshi Takeo, Chi Matsumura   +2 more
openaire   +1 more source

Organocatalyzed nucleophilic addition of pyrazoles to 2H-azirines: asymmetric synthesis of 3,3-disubstituted aziridines and kinetic resolution of racemic 2H-azirines

Chemical Communications, 2016
An asymmetric nucleophilic addition of pyrazoles to 2H-azirines via organocatalytic kinetic resolution afforded chiral aziridines and azirines simultaneously.
Dong, An, Xukai, Guan, Rui, Guan, Lajiao, Jin, Guangliang, Zhang, Suoqin, Zhang   +5 more
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Equilibration of 2H-azirine with vinylnitrene

Journal of the Chemical Society, Chemical Communications, 1972
Treatment of 2,3-diaryl-2H-azirine-2-carboxamide with triphenylphosphine and carbon tetrachloride affords the triphenyliminophosphorane (4).
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Asymmetric radical additions of trialkylboranes to 2H-azirine-3-carboxylates

Chemical Communications, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
Erik, Risberg, Andreas, Fischer, Peter, Somfai   +2 more
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ChemInform Abstract: ALKYLATION AND SILYLATION OF 2H‐AZIRINES

Chemischer Informationsdienst, 1985
AbstractDas Azirin (I) wird zu (II) lithiiert, das mit elektrophilen Reagentien in der Seitenkette zu (III) substituiert wird.
P. F. BELLOIR, A. LAURENT, P. MISON, R. BARTNIK, S. LESNIAK   +4 more
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Recent approaches to the synthesis of 2H-azirines

Chemistry of Heterocyclic Compounds, 2019
The most recent (2013–2018) synthetic approaches toward 2H-azirine derivatives are summarized and discussed. This minireview covers the latest examples on the synthesis of 2H-azirines that can be gathered in five distinct categories: the Neber approach, decomposition of vinyl azides, ring contraction of isoxazoles, oxidative cyclization of enamine ...
Ramkumar N., Voskressensky L.G., Sharma U.K., Van Der Eycken E.V.   +3 more
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