SYNTHESIS OF 9,10-BENZOTETRACYCLO[5.3.0.0<sup>2,4</sup>.0<sup>3,5</sup>]DECA-1(7),9-DIEN-6-ONE, A VALENCE ISOMER OF BENZ[<i>a</i>]AZULEN-9(10<i>H</i>)-ONE
9,10-Benzotetracyclo[5.3.0.02,4.03,5]deca-1(7),9-dien-6-one (2), a valenceisomer of benz[a]azulen-9(10H) -one (3), has been synthesized from 5,6-benzobicyclo [3.2.0] hepten-2-one utilizing the oxa-di-π-methane rearrangement.
Diastereomeric monocyclic diallenes. Synthesis and properties of the diastereomeric 3,4,9,10-cyclododecatetraene-1,7-diones and 3,4,10,11-cyclotetradecatetraene-1,8-diones