NMR spectra of 5-substituted 1,3,5-triphenyl-2,4-pentadien-1-ones and of 1,3,5-triphenyl-5-imino-3-penten-1-ones

Add time:08/05/2019    Source:sciencedirect.com

NMR Spectra of reaction products of 2,4,6-triphenylpyrylium salts with alkali cyanides, dialkylamines or alkoxides (IIIa, X = CN, NR2, OR), and hydroxylamine, hydrazine, phenylhydrazine, ammonia, or hydroxide (IVa, Y = NOH, NNH2, NNHPh, NH, O) are discussed. The latter products are possibly formed by intramolecular 1,5-hydrogen transfer. Phenacyl methylene protons of 3,5-diphenyl-5-phenacyl-2-pyrazolines (IX, Z = NH or NPh) are magnetically non-equivalent, unlike those of 3,5-diphenyl-5-phenacyl-2-isoxazoline (IX, Z = O).

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