81568-58-3Relevant articles and documents
Benzocyclobutenes. Part 7. Synthesis and X-ray Crystal Structure of Cyclobutaphenanthrene-1,2-dione and the Synthesis of Hexabenzotriphenylene
Hacker, Nigel P.,McOmie, John F. W.,Meunier-Piret, Jacqueline,Meerssche, Maurice Van
, p. 19 - 24 (2007/10/02)
Photocycloaddition of tetrachloroethene to phenanthrene gives 1,1,2,2-tetrachloro-1,2,2a,10b-tetrahydrocyclobutaphenanthrene.Treatment of this compound with N-bromosuccinimide gives the corresponding tetrachlorodihydrocyclobutaphenanthrene which can be hydrolysed to cyclobutaphenanthrene-1,2-dione.The 1H and 13C n.m.r. spectra and X-ray molecular structure of the dione have been determined.Flash-vacuum pyrolysis of the dione gives a low yield of hexabenzotriphenylene.