PHOTOCYCLOBUTENOLIZATION OF 2,4,6-TRIISOPROPYLBENZOPHENONE AND ITS DERIVATIVES STUDIED BY PICO- AND NANOSECOND SPECTROSCOPY

By pico- and nanosecond spectroscopy methods, the transient absorption spectra and lifetimes of the triplet states of 2,4,6-triisopropylbenzophenones, the 1,4-biradicals and the dienols were measured. The decays of the T′←T1 absorptions were accompanied by the rate matching increase in the absorptions -of the biradicals.