Cobalt(III) Complexes of Various Salen-Type Ligand Bearing Four QuaternaryAmmonium Salts and Their Reactivity for CO2/Epoxide Copolymerization

Bulletin of the Korean chemical society

Jobi Kodiyan Varghese¹  Bo Eun Kim¹  Bun Yeoul Lee¹  Yonggyu Han¹ 

关键词: Carbon dioxide;    Epoxide;    Salen-cobalt complexes;    Quaternary ammonium salt;    Polymerization;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Ligand variation was carried out on a cobalt(III) complex of Salen-type ligand comprised of 1,2-cyclohexenediamine and salicylaldehyde bearing a methyl substituent on 3-position and -[CMe(CH2CH2CH2N+Bu3)2] on 5-position, which is a highly active catalyst for CO2/propylene oxide copolymerization. Replacement of the methyl substituent with bulky isopropyl group resulted in alteration of the binding mode, consequently lowering turnover frequency significantly. Replacement with an ethyl group preserved binding mode and activity. Replacement of the tributylammonium unit with trihexylammonium or trioctylammonium, or replacement of 1,2-cyclohexenediamino unit with -NC(Me)2CH2N- decreased activity, even though the binding mode was unaltered.

【 授权许可】

Unknown