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NMR study on the tautomeric equilibria between the hydrazone imine and diazenyl enamine forms in side chained quinoxalines: Solvent effects and temperature dependence

โœ Scribed by Yoshihisa Kurasawa; Aiko Ishikura; Kazue Ikeda; Tomoyoshi Hosaka; Yuko Matsumoto; Atsushi Takada; Ho Sik Kim; Yoshihisa Okamoto


Book ID
112130868
Publisher
Journal of Heterocyclic Chemistry
Year
1994
Tongue
English
Weight
303 KB
Volume
31
Category
Article
ISSN
0022-152X

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โœ Taketsugu Seki; Yasuo Iwanami; Yoshiyuki Kuwatani; Masahiko Iyoda ๐Ÿ“‚ Article ๐Ÿ“… 1997 ๐Ÿ› Journal of Heterocyclic Chemistry ๐ŸŒ English โš– 491 KB

## Abstract 3โ€(1โ€Benzoyl)ethylโ€1__H__โ€pyrido[2,3โ€__b__]pyrazinโ€2โ€one (7), 3โ€(1โ€ethoxycarbonyl)ethylโ€1__H__โ€pyrido[2,3โ€__b__]โ€pyrazinโ€2โ€one (8), and 3โ€(1โ€benzoyl)ethylโ€1__H__โ€quinoxalinโ€2โ€one (9) exist only in the imine form due to the steric effect of the methyl substituent. As regards the imineโ€en