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• W2317762022 abstract "The tetraarylazadipyrromethene chromophore class has gained increasing attention in the past decade for a diverse set of scientific interests and applications. The most direct synthetic route available for their generation is heating of 4-nitro-1,3-diarylbutan-1-ones with an ammonium source in an alcohol solvent. Despite the practical simplicity, the reaction pathway(s) for these conversions are lengthy and unclear. To gain insight into the steps involved, 15N labeling experiments with MS and NMR analysis were utilized for conversion of 4-nitro-1,3-diphenylbutan-1-one 1 into tetraphenylazadipyrromethene 2 with 15NH4OAc. To permit examination of later stages of the reaction sequence to 2, the 15N-labeled potential intermediate 3,5-diphenyl-1H-pyrrol-2-amine 10 was synthesized. A study of the dimerization pathway utilizing 15N-labeled 10 revealed an unprecedented nitrogen rearrangement in the final stages of the pathway involving a ring-opening/closing of a pyrrole ring. Utilizing 15N labeling experiments we have shown that 2,4-diphenylpyrrole 8 can also react under the reaction conditions with 3,5-diphenyl-2H-pyrrol-2-imine 7 (from oxidation of 10) to produce 2. Overall in the conversion of 1 into 2, two related pathways are ongoing concurrently; the first involves a dimerization of 3,5-diphenyl-2H-pyrrol-2-imine 7, and the other a reaction of 7 with 2,4-diphenylpyrrole 8." @default.
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• W2317762022 date "2012-10-04" @default.
• W2317762022 modified "2023-09-24" @default.
• W2317762022 title "Mechanistic Insight into the Formation of Tetraarylazadipyrromethenes" @default.
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• W2317762022 doi "https://doi.org/10.1021/jo301972w" @default.
• W2317762022 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23006137" @default.
• W2317762022 hasPublicationYear "2012" @default.
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