Site selectivity in the reaction of tetracyanoethene with tetracyclo [5.3.2.02,10. 03,6] dodeca-4,8,11-triene
作者:M. Burdisso、A. Gamba、R. Gandolfi、R. Oberti
DOI:10.1016/s0040-4020(01)87499-8
日期:1986.1
homo-Dies-Alder reaction leading to 4 was shown to be reversible. In methanol compound 4 gave rise to a zwitterion which was trapped by solvent. Reaction mechanisms are discussed. A zwitterion is proposed as intermediate on the pathway to 6 whereas experimental findings do not permit a definitive choice between an ionic two step and a concerted cycloaddition in the formation of 4. The neutral and base