Abstract
The competition between exo and endo transition states in the cycloaddition of 4-arylidene-5-pyrazolones and vinylethers is rationalized in terms of steric and electronic interactions. The steric interactions depend mainly upon the requirements of the substituent in position 3 of the starting pyrazolone. The electronic factors are rationalized in terms of secondary non-bonding interactions between the HOMO of the vinylether which acts as donor and the LUMO of the pyrazolone which acts as acceptor. An E configuration of the pyrazolone is suggested as “reacting” species.
Sign-in/Register to access full text options 
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 callDisclaimer: 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.
