A concise and efficient photoinduced rearrangement of (E)-3-arylvinyl-4H-chromen-4-ones for the synthesis of benzoaryl-5-yl(2-hydroxyphenyl)methanones is described. Benzoaryl-5-yl-(2-hydroxyphenyl)methanones were obtained in 77-95% yields via the irradiation of (E)-3-arylvinyl-chromones in the 95% EtOH with a high-pressure mercury lamp at room temperature under Ar atmosphere. The reported method provides a novel procedure for the synthesis of α,α'-diaryl ketone derivatives without addition of any transition metals and oxidants or other additives. A plausible mechanism was proposed, and the rearrangement product was characterized by NMR, HRMS, and X-ray.
A strategy
for the syntheses of benzofuranoquinolines and its analogues
via the irradiation of o-phenylfuranyl/thienylpyridines/pyrimidines
in DCM with UV light at rt under an argon atmosphere is described.
The mechanism of this reaction through the process of 6π-electrocyclization,
[1,5]-hydrogen shift, and 1,3-eneamine tautomerism leading to H2 evolution was elucidated. Notably, the syntheses of cis-8b-methyl-8b,13a-dihydrobenzo[f]benzofuro[3,2-h]quinolone via the photoinduced rearrangement of 2-(3-methylbenzofuran-2-yl)-3-phenylpyridine
relevant to the mechanism of this reaction highlights the importance
of the developed methodology.
Two new deep-red TADF emitters with the integrating of dual rigid donor and acceptors are elaborately designed. Electroluminescent devices employing them as emitting layers achieve high external quantum efficiency (EQE)...
Equilibrating the critical parameters that associated with the thermally activated delayed fluorescence process propose the prerequisite for realizing high performance electroluminescence devices. Herein, precious manipulations relying on the model near-infrared...
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