Abstract
The syntheses of a number of polycyclic systems containing potential cyclobutadiene rings are described. The main route to these compounds involved a bis-Wittig reaction with a compound containing a four-membered ring, but alternative routes are also discussed. The properties of the compounds are described, and it is shown that, in those cases in which delocalization occurs, the nuclear magnetic resonance spectra are consistent with those systems having a paratropic contribution from the four-membered ring. In the case of 2-thianorbiphenylene, the paratropic component can be removed by oxidation to 2-thianorbiphenylene 2,2-dioxide. The electronic spectra of biphenylene, 2-thianorbiphenylene, and tetraphenyl-2,5-dithiabisnorbiphenylene were found to be similar.
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 callMore From: The Chemistry of Nonbenzenoid Aromatic Compounds—2
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.
