The interaction of α-diazoketones with hydroxylic solvents

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Abstract
The diazo and carbonyl stretching bands of four diazoketones were studied inCCl4/MeOH mixtures as solvent, where the amount of hydroxylic solvent was linearly varied. The analogous behaviour afforded by the C—O band, either where cis/trans conformers are present (diazoacetone) or when conformational equilibria are hindered by chemical and/or steric reasons (the other three molecules), clearly indicates that local vibrator–solvent interactions are operative, probably via hydrogen bonding. Some minor effects due to the bulk dielectric constant of the medium were also observed.

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