中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 3,3'-dibromo-5,5'-bis(ethoxycarbonyl)-4,4'-dimethyl-2,2'-dipyrrylmethane | 7164-22-9 | C17H20Br2N2O4 | 476.165 |
4,5-二甲基-1H-吡咯-2-羧酸乙酯 | 4,5-dimethyl-pyrrole-2-carboxylic acid ethyl ester | 2199-45-3 | C9H13NO2 | 167.208 |
—— | 3,5-dimethyl-pyrrole-2,4-dicarboxylic acid-2-ethyl ester-4-benzyl ester | 312510-33-1 | C17H19NO4 | 301.342 |
With the aim of furthering our investigations into the asymmetric complexation of dipyrrinato ligands, a dipyrrin bearing a stereogenic centre directly adjacent to the conjugated skeleton was synthesized. The electron-withdrawing nature of the chiral 4-(2,2,2-trifluoro-1-hydroxyethyl)- substituent significantly reduced the nucleophilicity of corresponding pyrroles, such that 2,2′-symmetrically substituted bis(dipyrrin)s bearing this motif were inaccessible. Furthermore, solutions of mononuclear dipyrrinato complexes were found to be less stable to acid-catalyzed decomplexation than the corresponding dinuclear complexes.Key words: dipyrrin, dipyrromethene, complexation, electron-poor pyrrole, chirality.