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  • 09월 08일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Development of imidazo[1,5-a]pyridine-derived N-heterocyclic carbene Cu(I) complexes for direct C-H carboxylation using CO2 [우수포스터상]

등록일
2015년 9월 3일 16시 13분 07초
접수번호
1282
발표코드
ORGN.P-428 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 15일 (목요일) 11:00~12:30
발표형식
포스터
발표분야
유기화학
저자 및
공동저자
박다애, 이준승1, 홍석원*
광주과학기술원(GIST) 신소재공학부, Korea
1전남대학교 화학과, Korea
N-Heterocyclic carbenes (NHCs) are often used as strong σ-donor ligands and numerous structural variation have been made to the prototypical imidazolylidene skeleton. Imidazo[1,5-a]pyridin-3-ylidenes (ImPy) have been developed as a rigid bicyclic variant of NHC to show unique electronic and steric properties. The substituents on the bicyclic ImPy can be projected deeply into the metal coordination sphere. Furthermore, the extended π-system in ImPy structure could increase the electron density at the carbene center. Herein we wish to report the synthesis of a series of bulky imidazo[1,5-a]pyridin-3-ylidenes copper(I) complexes and their application in direct C-H carboxylation of benzoxazole with CO2. The direct C-H carboxylation with CO2 would be highly attractive and atom-economical routes to carboxylic acids. The molecular structure of a novel ImPy-Cu(I) complex was determined by X-ray crystallography and the ImPy-Cu(I) complex efficiently catalyzed the direct C-H carboxylation of benzoxazole derivatives with CO2 in good yields. It is interesting to note that ImPy-Cu(I) complex with a 2,6-diisopropyl phenyl unit exhibited a better catalytic activity than the similarly substituted imidazol-2-ylidene copper(I) complex [(IPr)CuCl] (95% vs 80% isolated yields after 14 h).

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