PHOTOCHEMICAL-REACTION BETWEEN ANTHRACENE AND CARBON-TETRACHLORIDE - SYNTHESIS AND ISOLATION OF LOROMETHYLENO)-(9'H)-10,10'-DIHYDRO-9,9'-BIANTHRYL (CDDB)

9-Chloro-10, 10'-bis-(dichloromethyleno)-(9'H)-10, 10'-dihydro-9,9'-bi anthryl (CDDB) is the main bichromophoric photoproduct among the vario us such products obtained on photochemical reaction between anthracene and carbontetrachloride. This is confirmed by various analyses e.g. C -H-N analysis, IR, NMR and mass spectroscopy to establish its structur e. In this ground state the dihedral angle between Cl-C-9-C-9' and C-9 -C-9'-H is approximately 60 degrees.