Reductive demetalation of manganese corroles:The substituent effect

• 作 者: Fei Yam Chi Kwong Chang
• 机 构: Department of Chemistry,The Hong Kong University of Science and Technology,Hong Kong,China,Departmen
• 出 处: Chinese Chemical Letters
• 发表日期: 2008年08期
• 关键词: manganese substituent reductive Electron moderate deficient dissolved removed si

The reductive demetalation of manganese corroles was investigated in CH_2Cl_2/HCl(aqueous)solvent by using SnCl_2 as reducing agent.It was found that the demetalation yields depend on the substituents of corrole macrocycle significantly.Electron- rich manganese corrole undergoes reductive demetalation more easily than electron-deficient ones.The isolated reductive demetalation yield of manganese 5,10,15-tris(phenyl)corrole in present system is moderate(46%).As for electron-deficient Mn(Ⅲ)5,10,15-tds(pentafluorophenyl)corrole,the acid-induced demetalation in HOAc-H_2SO_4(V/V=3:1)is preferable with an isolated yield of 67%.

The reductive demetalation of manganese corroles was investigated in CH 2 Cl 2 / HCl (aqueous) solvent by using SnCl 2 as reducing agent. It was found that the degeneration of depend on the substituents of corrole macrocycle significantly. Electron-rich manganese corrole undergoes reductive demetalation more easily than electron-deficient ones. The isolated reductive demetalation yield of manganese 5,10,15-tris (phenyl) corrole in present system is moderate (46%). As for electron-deficient Mn (III) 5,10,15-tds pentafluorophenyl) corrole, the acid-induced demetalation in HOAc-H 2 SO 4 (V / V = ​​3: 1) is preferably with an isolated yield of 67%.