VIBRATIONAL-SPECTRA OF BETA-LACTAMS .3. POTASSIUM 2-AZETIDINONE-1-SULFONATE AND ITS ISOTOPIC COMPOUNDS

The IR and Raman spectra of potassium 2-azetidinone-1-sulfonate and it s three deuterated and two N-15-substituted compounds have been record ed, and the observed bands have been assigned on the basis of the isot ope effects and the normal coordinate analysis. Comparison of the forc e constants for the amide group among 2-azetidinone, 1-methyl-2-azetid inone and potassium 2-azetidinone-1-sulfonate indicates that there is a correlation between these constants and the ease of hydrolysis which was determined by NMR spectroscopy, depending on the amide resonance.