Preparative Organic Chemistry
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ChemInform Abstract: Flash Vacuum Pyrolysis of Phenanthrene-3,4-dicarboxylic Anhydride and of Cyclobuta(c)phenanthrene-1,2-dione: Products of Ring Contraction, Insertion and Ring Cleavage.
First published: October 1, 1991
Abstract
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ChemInform Abstract
Flash vacuum pyrolysis of both the title compounds (Ia) and (Ib) gives the same products (II)-(IV), the structures of the two ethynes of which are determined by independent syntheses. A mechanism is proposed which involves a reversible equilibrium between the intermediates (V) ( → (II)) and (VI) (→ (III) and (IV)).
