Aromatic and Benzylic C−H Bond Activation in the System Bis(dicarbonylrhodium(I))- porphyrinate−Hydrocarbon Solvent
摘要:
Metalation of C6H6 has been known for a long time as a side reaction occurring in refluxing benzene solutions of Rh-2(CO)(4)(TPP) (TTP = tetraphenylporphyrin). Rather than representing the intrinsic reactivity of this complex, such hydrocarbon activation proceeds via Rh-II(por) and Rh-III(por) derivatives resulting from oxidation of Rh-2(CO)(4)(TPP) with adventitious H2O and/or O-2. This reaction can be extended to other aromatic substrates and represents an efficient synthetic route to certain organometallic Rh-III(TPP) derivatives.[GRAPHICS]
Alkylation of Rhodium Porphyrins Using Ammonium and Quinolinium Salts
作者:Samuel J. Thompson、Guangbin Dong
DOI:10.1021/om500438s
日期:2014.7.28
Alkylation of rhodium(III) porphyrins [Rh-II(por)] was achieved under relatively mild conditions in up to 98% yields, where readily available ammonium and quinolinium salts were utilized as the alkylating agents. This transformation tolerates air and water, thus serving as a convenient method to prepare a variety of alkyl- and benzyl-Rh-III(por) complexes. Preliminary mechanistic studies support an S(N)2-like reaction pathway involving a Rh-I(por) anion intermediate.