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.
本研究结合
重氮乙酸乙酯对烯烃的
环丙烷化反应,对含有双齿 N,O-希夫碱
配体的 p-Cymene-Ru 催化剂进行了研究。研究分为两个部分。(1) 利用傅立叶变换红外光谱跟踪
重氮乙酸乙酯的分解过程,并计算基本动力学参数。(2) 然后通过气相
色谱分析确定
环丙烷化的选择性和非对映选择性。通过傅立叶变换拉曼光谱和核磁共振光谱对催化剂和
配体进行全面鉴定。此外,还通过 TGA 测量检查了催化剂的稳定性。研究特别发现,
配体的电子特性决定了催化剂的性能。