Abstract
The photochemical ring opening and ring cleavage reactions of 6b,8a-dihydrocyclobut[a]acenaphthylene (1) and two similar compounds are described. These reactions occur at room temperature only if the irradiating light intensity is greater than MW/cm 2, easily obtained with excimer and dye lasers. This is rationalized in terms of a consecutive two-photon absorption to reach higher-lying reactive states. The mechanism proposed for the reaction of 1 also describes the product distribution, which depends on irradiation parameters such as laser pulse length, wavelength, intensity, and oxygen content of the solvent.
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