Tricyclo[3.1.0.02,6]hexanedione (the Valene of o-Benzoquinone), Bicyclo[2.1.1]hexane-2,3-dione, and Valenes of a Quinoxaline, of Phenazine, and of a Benzophenazine†
This work was supported by the Fonds der Chemischen Industrie and the Deutsche Forschungsgemeinschaft.
Graphical Abstract
The Swern oxidation is ideal for the transformation of strained cis-1,2-cyclo-pentanediols such as 1 to α-diketones such as 2. Compound 2, the valene of o-benzoquinone, is thus readily accessible. Its synthetic potential is demonstrated by the construction of other valenes, such as 3 (reaction of 2 with diaminomaleonitrile).