859157-79-2

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• 875-79-6 1,2-dimethylindole 
• 104-94-9 4-methoxy-aniline 
• 33022-90-1 1-(1,2-dimethyl-1H-indol-3-yl)ethanone 
• 133674-62-1 2-bromo-1-(2,5-dimethyl-furan-3-yl)ethanone 
• 859157-78-1 1-(2,5-dimethyl-furan-3-yl)-2-(4-methoxy-phenylamino)-ethanone 
• 50776-25-5 2-bromo-1-(1,2-dimethyl-indol-3-yl)-ethanone 

Relevant academic research and scientific papers

Study on photochromism of diarylethenes with a 2,5-dihydropyrrole bridging unit: A convenient preparation of 3,4-diarylpyrroles from 3,4-diaryl-2,5- dihydropyrroles

Symmetric and nonsymmetric diarylethenes with a 2,5-dihydropyrrole bridging unit have been prepared, and the photochromic properties are investigated. Both symmetric and nonsymmetric diarylethenes with 2,5-dihydropyrrole bridging units undergo reversible ring-opening and ring-closing photoisomerization reactions in nonpolar solvents with UV/vis light, and some of them exhibit good fatigue resistance and no marked degradation detected after 10 cycles via an on/off switch. In polar solvents, however, photochromic diarylethenes with 2,5-dihydropyrrole bridging units produce 3,4-diarylpyrrole derivatives instead of the ring-closing isomer of diarylethenes with UV light irradiation. A class of N-substituted 3,4-diphenylethenes with 2,5-dihydropyrrole bridging units were prepared and used as templates to investigate the conversion reactions. The mechanism of photoconversion of 3,4-diaryl-2,5-dihydropyrroles to 3,4-diarylpyrroles was explored as well.