Metalation and Methyl Group Migration in 21-, 22-, and 23-Methylcarbaporphyrins: Synthesis and Characterization of Palladium(II), Rhodium(I), and Rhodium(III) Derivatives
作者:Alissa N. Latham、Gregory M. Ferrence、Timothy D. Lash
DOI:10.1021/acs.organomet.8b00863
日期:2019.1.28
palladium(II) acetate in refluxing acetonitrile for short time periods gave a 23-methyl palladium(II) complex but prolonged reaction times afforded a rearranged 21-methyl product. The 23-methyl complex can be isolated but gradually converts into the 21-methyl derivative even in the solid state. 21-Methyl- and 22-methylcarbaporphyrins reacted with [Rh(CO)2Cl]2 to give rhodium(I) complexes. However,
已经开发出合理合成的23-甲基碳卟啉。3,4-二乙基-1-甲基吡咯在酸性条件下反应acetoxymethylpyrrole得到Ñ -methyltripyrrane,和之后的酯保护基团的裂解,所述tripyrrolic中间体与在三氟乙酸,得到所需的存在茚二醛缩合ñ -甲基碳卟啉。与乙酸钯(II)在回流的乙腈中短时间反应,得到23-甲基钯(II)配合物,但是延长的反应时间提供了重排的21-甲基产物。可以分离出23-甲基配合物,但是即使在固态下也可以逐渐转化为21-甲基衍生物。21-甲基和22-甲基碳卟啉与[Rh(CO)2 Cl]反应2得到铑(I)络合物。然而,当在相同条件下使23-甲基碳卟啉反应时,分离出铑(III)衍生物。该络合物在Rh(III)和21-碳原子之间包含一个桥连的亚甲基单元,因此必须通过甲基迁移-环化过程形成。