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The oxidation of 2,2′-(m-phenylene)bis(4,5-diphenylimidazole) 1 with potassium ferricyanide in benzene-aqueous KOH heterogeneous solution gave two dimers 2 and 3; 2: piezochromic and photochromic dimer whose structure is deduced by NMR as an anti isomer of 3,3: photochromic dimer with syn-[3.3]metacyclophane structure elucidated by X-ray structural analysis. Photolysis (>310 nm) of these dimers...
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