Infrared and Raman spectra of 1-methylcyclopropene

Abstract

Abstract 1-Methyl cyclo propene is unique in that it contains a carbon-carbon double bond in a strained three-membered ring with methyl, methylenic and vinylic protons present. The molecule has C 3 symmetry and possesses 24 fundamental vibrations: 15 a ' + 9 a ″. Vapor and solid phase infrared (250–4000 cm −1 ) and liquid phase Raman spectra have been obtained and a study of the molecular vibrations, as revealed by its spectrum, has been completed. Assignment of the fundamentals has been made from vapor phase band contours, characteristic group frequencies and Raman polarization data.