Immobilized cellulase (CBH I) as a chiral stationary phase for direct resolution of enantiomers
Immobilized cellulase (CBH I) as a chiral stationary phase for direct resolution of enantiomers
复制标题
固定化纤维素酶 (CBH I) 作为手性固定相，用于直接拆分对映体
DOI：
10.1021/ja00167a081
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发表时间：
1990
影响因子：
15
通讯作者：
C. Pettersson
中科院分区：
文献类型：
--
作者：
P. Erlandsson;I. Marle;L. Hansson;R. Isaksson;G. Pettersson;C. Pettersson
一些Rh配合物也提出了OH插入烯烃C= C键的机制。[11]我们没有证据表明在烯烃反应过程中Rh（111）-（2 2）-0表面上存在吸附的OH。化学吸附的OH在低于250 K时会产生气态水，15，16，但在低于350 K时，在苯乙烯反应过程中不会形成水（图1）。此外，在X射线光电子能谱中没有检测到OH。Rh（111）-p（2X2）-O表面吸附的氧氧化苯乙烯生成苯乙酮是一个前所未有的均相和非均相体系的反应。这项研究表明CH键的酸性不控制该氧化反应的选择性或动力学。未来的工作将针对调查的机制，这一不寻常的过程。
Mechanisms involving OH insertion into the C= C bond of alkenes have also been proposed for some Rh complexes. 11 We have no evidence for the presence of adsorbed OH on the Rh (111)-(2 2)-0 surface during alkene reaction. Chemisorbed OH wouldproduce gaseous water below 250 K, 15, 16 yet no water is formed below 350 K during sytrene reaction (Figure 1). Furthermore, no OH is detected in X-ray photoelectron spectra. The oxidation of styrene to acetophenone by oxygen adsorbed on Rh (111)-p (2X2)-0 is an unprecedented reaction for both homogeneous and heterogeneous systems. This study demonstrates that the acidity of CH bonds does notcontrol selectivity or kinetics for this oxidation reaction. Future work will be directed toward investigation of the mechanism of this unusual process.