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Abstract
AbstractThe synthesis of hitherto unknown N‐(2‐hydroxyphenyl) substituted 2‐alkylamino‐4,6‐diarylbenzophenones 3 from 2,4,6‐triarylpyrylium salts 1 and 3‐alkyl‐2‐methylbenzoxazolium salts 2 in the presence of triethylamine in ethanol by a 2,5‐[C4+C2] pyrylium ring transformation is reported. Structure elucidation is performed by an X‐ray crystal structure determination of the benzophenone 3a. Spectroscopic data of the transformation products and their mode of formation via anhydrobases of the salts 2 are discussed.
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