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Evidence for a zwitterionic intermediate in the 2+2 cycloaddition of tetracyanoethylene to a trans-fixed 1,3-diene

✍ Scribed by Roll Huisgen; Joaquin Plumet Ortega

Book ID: 104246139
Publisher: Elsevier Science
Year: 1978
Tongue: French
Weight: 193 KB
Volume: 19
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)95115-9

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✦ Synopsis

Tetracyanoethylene (TCNE) belongs to the most active dienophiles in . the Diels-Alder reaction.' Trans-fixed 1,3-dienes, however, combine with TCNE in 2+2 cycloadditions to give vinylcyclobutanes; 293 the second double bond effects an activation, No. 41 ACKNOWLEDGMENT. J.P.O. expresses his gratitude to the Alexander von Humboldt-Stiftung for a stipend.

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