1391996-54-5Relevant articles and documents
Aryl carbon-chlorine (Ar-Cl) and aryl carbon-fluorine (Ar-F) bond cleavages by rhodium porphyrins
Qian, Ying Ying,Lee, Man Ho,Yang, Wu,Chan, Kin Shing
, p. 82 - 89 (2015/06/08)
Aryl carbon-chlorine (Ar-Cl) bond cleavage has 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. The selectivity of the Ar-F or Ar-Cl bond cleavage can be controlled by tuning the temperature and substrate concentration.
Base-promoted aryl carbon-iodine and carbon-bromine bond cleavage with rhodium porphyrin complexes: Scope and mechanism
Qian, Ying Ying,Chan, Kin Shing
, p. 5452 - 5462 (2012/11/13)
Base-promoted aryl carbon-iodine and carbon-bromine bond (Ar-X, X = I, Br) cleavage by rhodium porphyrin complexes was achieved to give the rhodium(III) porphyrin aryls Rh(ttp)Ar (ttp = tetra-p-tolylporphyrinato dianion). Mechanistic studies showed that RhII2(ttp)2 is the intermediate for Ar-X (X = I, Br) cleavage. The Ar-X cleavage process goes through a rhodium(II) porphyrin radical mediated ipso-substitution mechanism.