An ET mechanism is decisively excluded for the zwitterionic cycloaddition of tetracyanoethylene and bis(4-methoxycinnamyl) ether. A polar mechanism for this and analogous zwitterionic cycloadditions is therefore strongly indicated.
T. Kim, H. Sarker and N. L. Bauld, J. Chem. Soc., Perkin Trans. 2, 1995, 577 DOI: 10.1039/P29950000577
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