Raman spectra are reported for diketene, 2,2,4,4-tetramethyl-l,3-cyclobutanedione, ß-butyrolactone, vinyl acetate, and dehydroacetic acid. The spectrum of diketene does not resemble that of any of the compounds whose spectra are available.2. Of the currently discussed structures for diketene it is possible by its Raman spectrum to exclude all except vinylaceto-/3-lactone and acetylketene. No definite choice between these two formulas has been made. Chicago, III.

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The vapor pressures of CH3COOH and CD3COOD have been measured by a static method from 25 to 125°and the data fitted to an Antoine equation. The liquid density of CD3COOD has been measured in the same temperature range and the data fitted to a cubic function of the temperature.

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