Benzocyclobutenedione and biphenylene are formed in high yield by the vapour phase pyrolysis of Diels–Alder adducts of phthalazine-1,4-dione and indazol-3-one, respectively.
D. L. Forster, T. L. Gilchrist, C. W. Rees and E. Stanton, J. Chem. Soc. D, 1971, 695b DOI: 10.1039/C2971000695B
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