Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Sterically congested 1-(phenylthio)-9-aryldibenzochalcogenophenes were prepared and photolyzed with a 400 W high pressure Hg lamp in benzene to afford triphenyleno[4,5-bcd]thiophenes. ... 1-(Phenylthio)-9-aryldibenzothiophenes were prepared and photolyzed with a high ...