Enthalpy- and/or entropy-controlled asymmetric oxidation: stereocontrolling factors in Mn–salen-catalyzed oxidation
作者:Tomohiro Nishida、Akio Miyafuji、Yoshio N Ito、Tsutomu Katsuki
DOI:10.1016/s0040-4039(00)01210-7
日期:2000.9
The degree of enantioselection by second-generation Mn-salen complexes was found to depend upon the conformation of their ligand and substrate nucleophilicity. Oxidation of usual olefins was better effected by using (R,S)-Mn-salen complexes as catalysts, while that of more nucleophilic ones was achieved by using (R,R)-Mn-salen complexes. This phenomenon was explained by analyzing the enthalpy and entropy factors of the reactions. (C) 2000 Elsevier Science Ltd. All rights reserved.