申请人:The Ohio State University
公开号:US06376664B1
公开(公告)日:2002-04-23
Cyclic bis benzimidazole ligands of the following formula are formed by contacting a (2-aminophenyl)-benzimidazole-4-carboxaldehyde ethylene acetal or a (2-nitrophenyl)-benzimidazole-4-benzaldehyde with an acid optionally in the presence of a metal or a metal salt.
wherein
R1 and R2 may be the same or different and are selected from H, an alkyl having 1 to 10 carbon atoms, a benzyl group, a substituted 2-ethylphenyl group, a carbonyl group, a phenyl substituent, a tosyl group, and an alkylsulfonate group;
R3 and R4 may be the same or different and are selected from H, methyl, and ethyl; and
R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, and R18 may be the same or different and are selected from H, alkyl having 1 to 10 carbon atoms, fluoride, chloride, bromide, iodide, nitro, amino, a carboxylate, an ester, and a phenyl group.
以下公式所示的环状双苯并咪唑配体是通过将(2-氨基苯基)-苯并咪唑-4-甲醛乙二醇缩醛或(2-硝基苯基)-苯并咪唑-4-苯甲醛与酸接触,可选地在金属或金属盐的存在下形成。
其中
R1和R2可以相同也可以不同,选择自H、具有1至10个碳原子的烷基、苄基、取代的2-乙基苯基、羰基、苯基取代基、对甲苯磺酰基和烷基磺酸基;
R3和R4可以相同也可以不同,选择自H、甲基和乙基;以及
R5、R6、R7、R8、R9、R10、R11、R12、R13、R14、R15、R16、R17和R18可以相同也可以不同,选择自H、具有1至10个碳原子的烷基、氟化物、氯化物、溴化物、碘化物、硝基、氨基、羧酸根、酯和苯基。