Ketocoumarins. A new class of triplet sensitizers was written by Specht, Donald P.;Martic, Peter A.;Farid, Samir. And the article was included in Tetrahedron in 1982.Product Details of 1646-27-1 This article mentions the following:
Derivatives of 3-ketocoumarins, e.g. I and II, were prepared by standard methods and showed the photophys. criteria of efficient triplet sensitizers. The ketocoumarins, with absorption maximum at 330-450 nm, have extinction coefficients of 104-105, which is an important criterion for efficient sensitization of thin films of polymers in photoresists and lithog. The singlet-triplet intersystem crossing (isc) efficiencies of several derivatives were â?, whereas in others a radiationless decay process competes with the isc, and is dominant in asym. substituted derivatives The triplet energies of the ketocoumarins were 48-60 kcal/mol. The phosphorescence spectra of some ketocoumarins show the presence of “frozen-in” rotamers. In the experiment, the researchers used many compounds, for example, Methyl benzofuran-2-carboxylate (cas: 1646-27-1Product Details of 1646-27-1).
Methyl benzofuran-2-carboxylate (cas: 1646-27-1) belongs to benzofurans derivatives. Benzofuran is the “”parent”” of many related compounds with more complex structures. For example, psoralen is a benzofuran derivative that occurs in several plants. They are also prone to polymerisation in the presence of concentrated mineral acids and Lewis acids.Product Details of 1646-27-1
Referemce:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem