Trapping and low temperature matrix isolation experiments show that 2-benzopyran-3-one (1) is efficiently generated by thermolysis or photolysis of the bis-lactone (2); flash vacuum thermolysis of (2) yields isocoumarin (5) and photolysis of (2) in an argon matrix gives (1) and the ketene (6).
D. A. Bleasdale, D. W. Jones, G. Maier and H. P. Reisenauer, J. Chem. Soc., Chem. Commun., 1983, 1095 DOI: 10.1039/C39830001095
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