Health & Environmental Research Online (HERO)


Print Feedback Export to File
8684873 
Journal Article 
CCCCXX. - Studies of dynamic isomerism. Part XXVIII. Absorption spectra of the ketonic and enolic forms of an α-diketone 
Lowry, TM; Moureu, H; Macconkey, CAH 
1928 
Yes 
Journal of the Chemical Society
ISSN: 0368-1769 
3167-3179 
English 
Benzylmethylglyoxal, C6H5·CH 2·CO·CO·CH3, shows an absorption band in the visible spectrum, with a maximum log ε=1.5 at 4300 in alcohol, or log ε=1.85 at 4600 in cyclohexane, but only a "step out" in the ultra-violet at about 3000 Å.U. The enolic isomeride, C6H 5·CH:C(OH)·CO·CH3, on the other hand, is colourless, but has a strong absorption band in the ultra-violet with a maximum log ε=4.3 at 3100 in alcohol, or 4.7 at 3100 in cyclohexane. Both bands are given by solutions in which the two isomerides are in equilibrium.