科研之友
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摘要
p-Cymene - Ru catalysts containing bidentate N,O-Schiff base ligands, known as active catalysts in various reactions, are studied in relation to the cyclopropanation of olefins with ethyl diazoacetate. The study is divided into two parts. ( 1) The decomposition of ethyl diazoacetate is followed by FT-IR and elementary kinetic parameters calculated. ( 2) The selectivity and diastereoselectivity of cyclopropanation is then determined by GC analysis. The catalysts and ligands are fully characterized by FT-Raman and NMR spectroscopy. Furthermore, catalyst stabilities are checked by means of TGA measurements. It is found especially that the electronic properties of the ligands determine catalyst performance.
- 出版日期2005
