Journal of the Chemical Society. Perkin transactions I p. 202 - 205 (1981)
Update date:2022-08-28
Topics:
Darcy, Paul J.
Heller, Harry G.
Strydom, Peter J.
Whittall, John
The pale yellow title compounds undergo reversible photochemical conrotatory electrocyclic reactions to give in quantitative yields deep red 7,7a-dihydrobenzofuran-5,6-dicaroxylic anhydrides, which are stable at 100 deg C.These photochromic systems, which have high quantum yields for photocolouration, are highly resistant to photodegradation and retain their photochromic properties in a variety of solvents.
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