Abstract
AbstractPMR coupling values and shifts of twenty three 1, 3‐dioxanes with rigid structure have been determined. The coupling data are in accordance with a chair conformation which is less buckled than that of cyclohexane derivatives. It is necessary to take into account the recently recognized influence of free electron pair orbitals on gem and vicinal coupling phenomena (11). An exceptional situation for the equatorial proton on C5 is found, not only for the couplings of this proton, but also for its shift. An influence caused by the shielding of the oxygen atoms (O1 and O3), their (equatorial) p‐orbitals overlapping with the C‐H orbital, has been shown to be responsible for coupling value variations.
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.