81568-57-2

Upstream product

• 604-83-1 9,10-dimethylphenanthrene 
• 53158-39-7 10-methylphenanthrene-9-carbaldehyde 
• 4707-71-5 Phenanthrene-9-carboxaldehyde 
• 85-01-8 phenanthrene 
• 883-20-5 9-methylphenanthrene 
• 7251-51-6 9,10-dimethyl-9,10-dihydrophenanthrene-9,10-diol 

Downstream Products

• 81568-58-3 N-benzylideneaminophenanthrene-9,10-dicarboximide 

Relevant academic research and scientific papers

Formation of biphenylene by elimination of C2 from 9,10-didehydrophenanthrene at 1100°C

Flash vacuum pyrolysis of phenanthrene-9,10-dicarboxylic anhydride 5 and of 2,2-dimethyl-5-(9'-fluorenylidene)-1,3-dioxan-4,6-dione 8 at 1100°C/0.03-0.04 mm Hg gave pyrolysates which were analysed by 1H NMR spectroscopy and shown to contain phenanthrene 9 as a major constituent and biphenylene 2 as a minor one.

Benzocyclobutenes. Part 7. Synthesis and X-ray Crystal Structure of Cyclobutaphenanthrene-1,2-dione and the Synthesis of Hexabenzotriphenylene

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.