Abstract
Abstract The contributions to 13C shifts from the diamagnetic term of the neighboring carbon atom and from the “ring-current” have been estimated by means of the equations given in a previous paper (J. Niwa, Bull. Chem. Soc. Jpn., 48, 118 (1975)). A semi-empirical expression has been derived for the substituent-induced 13C chemical shift in an aromatic side chain by considering such contributions in addition to the local diamagnetic and paramagnetic terms of the carbon atom in question. The applicability of the expression has been examined for α-carbons of 4-substituted derivatives of styrenes and α-methylstyrenes, and for 1′-carbons of 4-substituted biphenyls.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.