Aryl carbon–chlorine (Ar–Cl) and aryl carbon–fluorine (Ar–F) bond cleavages by rhodium porphyrins
作者:Ying Ying Qian、Man Ho Lee、Wu Yang、Kin Shing Chan
DOI:10.1016/j.jorganchem.2015.05.039
日期:2015.8
been achieved with rhodium(III) tetrakis-4-tolylporphyrin chloride (Rh(ttp)Cl) to give Rh(ttp)Ar. For 4-chlorofluorobenzene, the aryl carbon–fluorine (Ar–F) bond cleavage competes with the Ar–Cl bond cleavage. Mechanistic investigations show that the Ar–Cl bond cleavage goes through metalloradical ipso-substitution mechanism, while the Ar–F bond cleavage goes through nucleophilic aromatic substitution