Comparative Study of the 13C Nuclear Magnetic Resonance Shifts of Carbonyl and Thiocarbonyl Compounds

Article abstract of DOI:10.1002/mrc.1260260805

The 13C spectra of nine novel and fifteen known derivatives YC(:X)Z with X = O or S are reported and compared with literature data.Two linear relationships between 13C=O and 13C=S are established depending on whether or not Y or Z is linked through an O atom to the C=X group.General equations for 13C=O and 13C=S in terms of the attached groups are also deduced.The 13C chemical shifts of n-butyl and n-octyl groups attached to the heteroatoms in this series of compounds are recorded and discussed.