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[세미나 공지] - 2014년 3월 21일(금)

3월 21일 금요일에 해외석학 특별초청세미나가 개최됩니다. 많은 참석 바랍니다. ------------------------- 제 목 : Metal Cluster Catalyst for Transesterification and Amide Alcoholysis 연 사 : Prof.Kazushi Mashima(오사카 대학교) 일 시 : 2014년 3월 21일(금) 오후 4시 30분 장 소 : 화학관 세미나실 (330226호실) ------------------------- Metal Cluster Catalyst for Transesterification and Amide Alcoholysis Kazushi Mashima Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560‑8531, Japan. Email: mashima@chem.es.osaka-u.ac.jp The ester moiety represents one of the most ubiquitous functional groups in organic compounds, serving as both key intermediate and protecting group in organic transformations. Among various esterification reactions established so far, one of the most convenient synthetic methods is transesterification, in which methyl or ethyl esters react with various alcohols to give the corresponding esters in one step. We developed -oxo-tetranuclear zinc cluster Zn4(OCOCF3)6O as an efficiently catalyst for transesterification, including chemoselective acylation of hydroxy group in the presence of aliphatic amino group, catalytic acetylation of alcohols and catalytic deacetylation of acetates. Because of mildness of the reaction conditions, these reactions have a high degree of functional-group tolerance. Recently, cobalt clusters mediate the same chemoselectivity for transesterification. Amide bond formation and degradation are also discussed.
- 2014-03-21
- 330226호실
- POSTED DATE : 2014-03-17
- WRITER : 관리자
- HIT : 5132
[세미나 공지] - 2014년 3월 20일(목)

3월 20일 목요일에 화학과 정규세미나가 개최됩니다. 많은 참석 부탁드립니다.감사합니다. ========================= 제 목 : 1-Sulfonyl-1,2,3-triazole: precursors for Rh(II)-azavinyl carbenes 연 사 : 유은정 교수(강원대학교) 일 시 : 2014년 3월 20일(목) 오후 4시 30분 장 소 : 화학관 세미나실 (330226호실) ------------------------- 1-Sulfonyl-1,2,3-triazole: precursors for Rh(II)-azavinyl carbenes Eun Jeong Yoo Department of Chemistry, Kangwon National University, Chuncheon 200-701, Republic of Korea E-mail: ejyoo@kangwon.ac.kr While the reaction of aryl azide with 1-alkyne affords stable 1,2,3-triazole at room temperature, the employment of e-deficient sulfonyl azide resulted in apparently different outcomes because the stability of 1,2,3-triazoles is affected by the substituents at the N1 atom of triazole cycle. Triazoles bearing a sulfonyl group at the N1 atom exist in equilibrium with diazoimine tautomer, and thus chemists took advantage of this process by trapping diazoimine with a Rh(II) catalyst to produce the Rh(II) azavinyl carbenes. Undoubtedly, development of new method to access Rh(II) carbene species, readily prepared from 1-sulfonyl-1,2,3-triazole, could expand the scope of carbene chemistry. In this seminar, the new reactivities of Rh(II) azavinyl carbenes toward carbonyl functional group, especially benzamides, will be presented. This catalytic reaction for the synthesis of Z-selective endiamines has a broad substrate scope with an excellent functional group tolerance even on a gram scale. Since amino moiety of the obtained endiamine product could be selectively removed by treating with NaBH4 to form Z-enamides, the developed routes are highly versatile and have great potential as a synthetic tool. Next, we disclose a protocol for N-H insertion of Rh(II) azavinyl carbenes with carbazoles. As opposed to 1,1-insertions typically observed with conventional donor-acceptor carbenes, these reactions proceed via an ylide intermediate followed by a stereospecific proton transfer.
- 2014-03-20
- 330226호실
- POSTED DATE : 2014-03-17
- WRITER : 관리자
- HIT : 5223
[세미나 공지] - 2014년 3월 6일(목)

세미나가 이번주 목요일(3월 6일)에 개최됩니다. 많은 참석 부탁드립니다.감사합니다. ========================= 제 목 : Nanodevice-Based Molecular Detection: Focused on the Nanogap Biosensor 연 사 : 윤완수 교수님(성균관대학교) 일 시 : 2014년 3월 6일(화) 오후 4시 30분 장 소 : 화학관 세미나실 (330226호실) ------------------------- Nanodevice-Based Molecular Detection: Focused on the Nanogap Biosensor Wan Soo Yun Department of Chemistry, Sungkyunkwan University Owing to the merits of direct electric measurements, extensive studies adopting the nano electronic/electric devices were reported so far for the detection of biologically or clinically important molecules. Recently, a nanogap-based method has been receiving highly-growing attention due to its simplicity, robustness, and flexibility in detecting various types of biomolecules. In this talk, our recent accomplishments in implementing the nanogap-based electric detection of biomolecules, basically in a passive mode, will be briefly introduced and discussed with the future prospect of an alternative type of measurements, an active mode.
- 2014-03-06
- 330226호실
- POSTED DATE : 2014-03-05
- WRITER : 관리자
- HIT : 5062
[세미나 공지] - 2014년 1월 21일(화)

세미나가 다음주 화요일(1월 21일)에 개최됩니다. 많은 참석 부탁드립니다.감사합니다.========================= 제 목 : Exceptional catalytic activities of novel QDots formed by sub-nanometric metal (0) clusters연 사 : Prof. M.Arturo López-Quintela(University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain)일 시 : 2014년 1월 21일(화) 오후 4시 장 소 : 화학관 세미나실 (330226호실)------------------------- Exceptional catalytic activities of novel QDots formed by sub-nanometric metal (0) clusters M.Arturo López-Quintela Laboratory of Magnetism and Nanotechnology (Nanomag), Technological Research Institute, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain. Green chemistry and energy conversion are two of the main topics, which will be preferentially addressed in the next years in order to resolve two main problems of the current society: pollution and energy supply. In both areas the main difficulties, which have to be resolved, are related to the poor efficiency of the current catalysts. Although in the past years a lot of work has been dedicated to tackle such problem very little improvements were achieved. Therefore, there is an urgent need of looking for new strategies to overcome the current difficulties. We have seen very recently that Au metal clusters, formed by a few number of atoms, are extremely active catalysts, reaching in some cases enzymatic activities for aerobic oxidation reactions1. At the same time, such clusters, although formed by metal elements, they display semiconductor-like properties, whose band gap can be fine tuned by changing only one atom in the cluster, so that they could be also essayed as photocatalysts. We have indeed observed that clusters can also be used as very efficient photocatalysts for water splitting 2 and the destruction of pollutants. Therefore, the use of these few-atom compounds can open new ways to overcome the current difficulties found with the common catalysts. In this talk it will be presented an overview of the state-of-the art of the catalytic properties of clusters focussing into the fields of self-cleaning, water splitting and aerobic oxidation. We want to acknowledge the financial support of the MCI, Spain (MAT2010-20442; MAT2011-28673-C02-01), MINECO, Spain (MAT2012-36754-C02-01), Xunta de Galicia (Grupos Ref.Comp.,GRC2013-044, FEDER Funds) and Obra Social Fundación La Caixa (2012-CL097).
- 2014-01-27
- 장소
- POSTED DATE : 2014-02-06
- WRITER :
- HIT : 4842
2013년 12월 화학과 정기세미나 소식입니다.

2013년 12월 화학과 정기세미나 소식입니다.
- 2014-01-02
- POSTED DATE : 2014-01-02
- WRITER : 관리자
- HIT : 4630