The absorption spectra Analogs of hexaphenylbenzene, prepared from each by reac-l), have been prepared, linked by a direct bond,-CH%-, 0, and S, respectively. syntheses have been described including the required bisdeoxybenzoins and bisbenzils. of the bistetracyclones have been briefly discussed. tion with tolan, produced a unique group of compounds melting in the range 440-460”.