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  • 09월 04일 13시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

In Search for Single-Component Selective and Switchable Catalysts for Ethylene Oligo- and Polymerization.

2009년 8월 24일 13시 47분 57초
금26D4구 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 11시 : 20분
공업화학 - Recent Trend in Green Chemical Processes
저자 및
Sandro Gambarotta
Dept of Chemistry, University of Ottawa, Ottawa, Ont. Canada, Korea
The processes of ethylene polymerization and selective tri- and tetramerization may be regarded as belonging to the same family of C-C bond forming processes. Yet, the reaction mechanisms followed by these reactions (respectively chain growth and metallacycle ring expansion) are conceptually very different. This is furthermore in contrast to the fact that both processes employ identical Ziegler-Natta type of conditions (use of a mixture of catalyst and activator). During this presentation, we will describe the results of our efforts to isolate catalytically active species. This was aiming at extracting critical information about reaction mechanism, metal oxidation state and factors responsible for the type of catalytic activity (poly- and oligomerization) and selectivity. A few catalytically active, hetero-dimetallic systems have been isolated, characterized and tested. The role of their geometry and structure within the catalytic cycle will be examined. A new simple and yet effective hemilabile ligand system has been designed while searching for mono-metallic single component catalysts. The results of the catalytic testing of these novel species will be described alongside with their chemical behavior and mechanistic significance. The use of this information to assist future design of novel catalytic systems will be also discussed.