67. “Thermolysis of the sulfur dioxide adducts of benzobenzvalene. The 1.3-dipolar behaviour of a sulfene”
    Burger, U.; Erne-Zellweger, D.; Sledeski, A. W.; Schmidlin, S.
    Tetrahedron Lett. 1989, 30, 2797-2800.

Pyrolysis (fvp) of a strained γ-sultine (3) produced 1H-indene-1-carboxaldehyde (8) and naphthalene. The key step in the production of aldehyde (8) involves a 1,3-dipolar cycloreversion, as evidenced by the trapping of an intermediate sulfene (6) with methyl acrylate. A diradical pathway is proposed for the formation of naphthalene.

DOI : 10.1016/S0040-4039(00)99128-7 

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