Abstract
By ferricyanide oxidation of 2-(4-methoxyphenyl)phenanthro[9,10- d]imidazole, three new photochromic compounds were obtained. These were 4-ethoxy-4H-, 4-methoxy-4H- and 2-methoxy-2H-phenanthro[9,10- d]imidazoles. These compounds gave the 2-(4-methoxyphenyl)-phenanthro[9,10- d]imidazolyl radical and acetaldehyde or formaldehyde by light irradiation. The imidazolyl radical dimerized gradually in the dark and the dimer dissociated to the imidazolyl radical on heating.
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