Abstract
Abstract The authors have investigated the Raman carbonyl stretching vibration of different aliphatic ketones, esters and aldehydes. The results concerning the frequency of the carbonyl are in agreement with those of previous workers; the mean values for an homologous series of saturated aliphatic ketones and esters are 1715 ± 3 cm −1 and 1738 ± 5 cm −1 . The scattering coefficient of the carbonyl line has been measured with an accuracy of 4 per cent and the following observations have been made: (1) The scattering coefficient of a non-conjugated carbonyl is relatively constant and proportional to the number of independent carbonyl groups in the molecule. (2) Conjugation of the carbonyl group with an ethylenic double bond increases strongly the scattering coefficient by a factor depending on the nature of the carbonyl (aldehyde,ketone or ester) the nature of the substituents on the molecule and the degree of conjugation allowed by steric factors
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
