Synthèses dans la série des dérivés polycycliques aromatiques hautement condensés. L'hexabenzo‐1,12; 2,3; 4,5; 6,7; 8,9; 10,11‐coronène, le tétrabenzo‐4,5; 6,7; 11,12; 13,14‐péropyrène et le tétrabenzo‐1,2; 3,4; 8,9; 10,11‐bisanthène

Abstract

Abstract The synthesis of hexabenz‐1,12;2,3;4,5;6,7;8,9;10,11‐coronene, using two different reaction schemes is described. The cyclodehydrogenation of hexaphenylbenzene, and the reaction of dibenz‐1,9;2,3‐anthrone with Zn/ZnCl 2 lead to identical products, the chemical and crystallographic properties of which demonstrate the structure of hexabenzcoronene. Furthermore, two other hydrocarbons have been isolated from the reaction of dibenzanthrone with Zn/ZnCl 2 . The UV. spectrum of the first, and its cyclization to hexabenzcoronene show that it is tetrabenz‐4,5;6,7;11,12;13,14‐peropyrene. The properties of the second indicate that it is tetrabenz‐1,2;3,4,8;9; 10,11‐bisanthene.