The infrared spectra of some fixed cisoid and trunsoid ap-unsaturated ketones have been examined. It is concluded that the ratio of the integrated band intensities of the C=O and C=C stretching vibrations gives the most certain indication of the geometry of the chromophore, being low in cisoid and high in transoid structures. The effect of steric hindrance to coplanarity of the chromophore on the infrared spectra is discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.