Dicyclohexenyl (I), which is easily accessible through dehydration of cyclohexanone- pinacol, has been used for diene syntheses by Gruber and Adamsl and by Barnett and Lawrence. 2 Further applications of this synthetic method are reported herein. The condensation product between (I) and maleic anhydride could be dehydrogenated to form phenanthrene-9, lO-dicarboxylic acid anhydride, 3 while lead tetraacetate effected ...