Abstract
The UV absorption spectrum of Z-2,5-dimethyl-1,3,5-hexatriene 1 is typical of a cZt triene, but the long wavelength tail Indicates the presence of the (minor) cZc rotamer. The sudden change In the photoreactivity of 1 around 290 nm is in agreement with selective excitation of these rotamers. No indication is obtained for an intrinsic excitation energy dependence of the photoreactivity of the Individual rotamers.
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