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- W2116883310 abstract "Pyrazolone Derivatives. V. U.V.-Spectroscopical and Photochemical Behaviour of N-mono and N,N-disubstituted 4-Aminomethylene-Δ2-pyrazolinones-(5) U.V.-spectra of N-mono and N,N-disubstituted 4-Aminomethylene-Δ2-pyrazolinones-(5) 1a–j and their dependence on solvent and temperature are discussed. N,N-disubstituted and N-monosubstituted 4-aminomethylene-3-methyl-1-phenyl-Δ2-pyrazolinones-(5) show a Z-/E-isomerization of the exocyclic CC-double bond at low temperatures. Compared to the N-monosubstituted compounds the compound 1j exhibits a strong interaction in the E-configuration between the aminomethylene-substituent and the methyl-group at the parazolone-ring. The Z-/E-isomerization depends on solvent polarity. With increasing solvent polarity the energy of activation of thermic E-/Z-isomerization is decreased. A low temperature cell is described." @default.
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- W2116883310 date "1978-01-01" @default.
- W2116883310 modified "2023-09-25" @default.
- W2116883310 title "Pyrazolonderivate. V [1]. UV-spektroskopisches und photochemisches Verhalten von N-mono- und N,N-disubstituierten 4-Aminomethylen-?2-pyrazolinonen-(5)" @default.
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- W2116883310 doi "https://doi.org/10.1002/prac.19783200404" @default.
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