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Volumn 54, Issue 36, 2015, Pages 10587-10591

Transition-Metal-Free α-Arylation of Enolizable Aryl Ketones and Mechanistic Evidence for a Radical Process

Author keywords

arylation; C C coupling; ketones; reaction mechanisms

Indexed keywords

AROMATIC COMPOUNDS; CHEMICAL REACTIONS; KETONES; MECHANICS; METAL HALIDES;

EID: 84940446640     PISSN: 14337851     EISSN: 15213773     Source Type: Journal    
DOI: 10.1002/anie.201502332     Document Type: Article
Times cited : (128)

References (60)
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    • To determine whether palladium impurities (in resublimed KOtBu, distilled solvents, or purified reagents) might catalyze the transformation, the reaction of PhI with propiophenone was performed in the presence of palladium (under the conditions of Table 1, entry 3 at 23°C). Whereas the blank experiment without Pd gave the expected phenylated propiophenone 1 in 65% yield after 13 hours, only 1% of 1 was obtained under the same conditions in the presence of [Pd(dba)2] (10 mol%, dba=dibenzylideneacetone). Therefore, the palladium complex dramatically slowed down the reaction. This result is a significant indication that the reaction is metal-free.
    • To determine whether palladium impurities (in resublimed KOtBu, distilled solvents, or purified reagents) might catalyze the transformation, the reaction of PhI with propiophenone was performed in the presence of palladium (under the conditions of Table 1, entry 3 at 23°C). Whereas the blank experiment without Pd gave the expected phenylated propiophenone 1 in 65% yield after 13 hours, only 1% of 1 was obtained under the same conditions in the presence of [Pd(dba)2] (10 mol%, dba=dibenzylideneacetone). Therefore, the palladium complex dramatically slowed down the reaction. This result is a significant indication that the reaction is metal-free.
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    • Starting from PhI, the expected product was obtained in very low yield under our standard conditions when dialkyl ketones were employed, whereas with α-tetralone, no reaction was observed.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.