Abstract: a-Phenylcinnamoyl chloride (I) upon pyrolysis with thionyl chloride forms 14c-hydro- 5a-phenylbenz-[a] indeno [2, 1-c] fluorene-5, 10-dione (CaOH1802)(11). The chemical properties and ultraviolet and infrared spectra of I1 closely approximate those of indones. An X-ray structure analysis was performed in order to unequivocally establish the molecular structure. Data from a single crystal (P21/a, a= 19.65 f 0.01 A, b= 10.55 i 0.01 A, c= 10.86 i ...
