Es wird die Darstellung der Verbindungen 2–6 durch Olefinierungsreaktionen des 5H‐Cyclopenta(cd)phenalen‐5‐ons (1) mit Diphenylketen, Phenyl‐cyanoketen, tert.‐Butyl‐cyano‐keten, Methylcyano‐keten beschrieben, darüber hinaus das Bis‐mercaptomethylen‐2H‐naphtho(1.8‐bc)thiophen (6).
(2-Aryl-2-cyanoethenyl)ketenes---annulated cyanophenols from azidoquinones
作者:Ken Chow、Harold W. Moore
DOI:10.1016/s0040-4039(00)96683-8
日期:1987.1
Annulated cyanophenols are the products derived from the thermolysis of 3,6-diaryl-2,5-diazido-1,4-benzoquinones in the presence of an alkyne. The transformation is envisaged to involve the following steps: 1)thermal fragmentation of the azidoquinones to arylcyanoketenes, 2) cycloaddition of the ketenes to an alkyne to give 4-aryl-4-cyanocyclobutenones, 3) electrocyclic ring opening of the cyclobutenone