- Chemical reactions of the stable carbene 1,3,4-triphenyl-4,5-dihydro-1H-1,2,4-triazol-5-ylidene
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The title compound 1,3,4-triphenyl-4,5-dihydro-1H-1,2,4-triazol-5-ylidene (1), a stable carbene, is chemically characterized via its reactivity towards a multitude of organic substrates. Its behaviour in insertion, addition and cycloaddition reactions allows its classification as a typical representative of nucleophilic carbenes. VCH Verlagsgesellschaft mbH, 1996.
- Enders, Dieter,Breuer, Klaus,Runsink, Jan,Henrique Teles
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- A quantitative study of substituent effects on oxidative cyclization of some 2-aryl-substituted aldehyde thiosemicarbazones induced by ferric chloride and cupric perchlorate
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As a development of our previous work, we performed a kinetic study of the oxidative cyclization reaction of some 2,4-diaryl-substituted aldehyde thiosemicarbazones 1a-n induced by ferric chloride and by cupric perchlorate. The results of cyclization of 1
- Noto, Renato,Lo Meo, Paolo,Gruttadauria, Michelangelo,Werber, Giuseppe
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p. 667 - 674
(2007/10/03)
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- Darstellung, Struktur und Reaktivitaet von 1,3,4-Triphenyl-4,5-dihydro-1H-1,2,4-triazol-5-yliden, einem neuen stabilen Carben
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Stichworte: Carbene * Cycloadditionen * Heterocyclen * Insertionen
- Enders, Dieter,Breuer, Klaus,Raabe, Gerhard,Runsink, Jan,Teles, J. Henrique,et al.
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p. 1119 - 1122
(2007/10/02)
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- Azocoupling of Quaternary 1,2,4-Triazolium Salts to Form 5-p-N,N-Dimethylaminophenylazo-1,2,4-triazolium Salts
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Quaternary 1,2,4-triazolium salts 1 couple easily with p-N,N-dimethylamino-benzenediazonium salts to form azodyes 3 (5-N,N-dimethylaminophenylazo-1,2,4-triazolium salts), preferably under solid-liquid phase transfer conditions using chloroform or methylene chloride and triethylamine or DABCO.Zwitterionic 1,2,4-triazolium salts (anhydro mercapto hydroxide, anhydro hydroxy hydroxide, and anhydro anilido hydroxide ("nitron")) couple as well.The azodyes - as also well known from industrially used types - absorb in the region of 500 nm and have high extinction coefficients.Substituents in 1-, 3- or 4-position of the triazolium ring exert no clear substituent effects.The quaternary 1,2,4-triazolium salts were synthesized according to standard procedures.
- Becker, H. G. O.,Hoffmann, Gerda,Gwan, Kim Mun,Knuepfer, L.
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p. 325 - 337
(2007/10/02)
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