3,6,9,10-Tetrahalogenphenanthrene. Eine neue Cycloarylierungsreaktion von DDT-Derivaten
作者:C. D. Weis
DOI:10.1002/hlca.19680510710
日期:1968.10.31
AbstractA simple synthesis of tetrachlorophenanthrene starting from DDT has been realized. 1,1,1,2‐tetrachloro‐2,2‐bis‐(4‐chlorophenyl)‐ethane (I) and its rearranged product 1,1,2,2‐tetrachloro‐1,2‐bis‐(4‐chlorophenyl)‐ethane (V) and other analogs substituted by halogen in the para‐position undergo a cycliarylation yielding 3,6,9,10‐tetrahalogenophenanthrenes. Partial dechlorination of this tetrachlorophenanthrene yields 3,6‐dichlorophenanthrene. Oxidation gives 3,6‐dichloro‐9,10‐phenanthrenequinone, and chlorosulfonation leads to 3,6,9,10‐tetrachloro‐2,7‐bis‐(chlorosulfonyl)‐phenanthrene. The mechanism of this cyclization reaction in presence of LEWIS acids is discussed and compared with the cyclization of DDT derivatives to yield fluorenones.