937807-95-9Relevant articles and documents
Lowering the barrier to C?H activation at IRIII through pincer ligand design
Chu, Wan-Yi,Goldberg, Karen I.,Rubashkin, Sophie B.
supporting information, p. 1296 - 1302 (2021/05/29)
Selective C?H activation of benzene and n-octane under mild conditions by a pincer IrIII carboxylate complex, (CCCMesityl)Ir(OAc)2(OH2) (1a), is described. A kinetic study of benzene activation was undertaken, and the resulting Eyring analysis informed the design of a tButylCCCMethyl-ligated IrIII carboxylate, which exhibited a ΔG? value for the reaction lower than that observed for 1a. Elimination of the aquo ligand was found to further lower the ΔG? value of benzene activation, enabling C?H activation by IrIII at temperatures as low as 30 °C.
Monoanionic bis(carbene) pincer complexes featuring cobalt(I-III) oxidation states
Ibrahim, Abdulrahman D.,Tokmic, Kenan,Brennan, Marshall R.,Kim, Dongyoung,Matson, Ellen M.,Nilges, Mark J.,Bertke, Jeffery A.,Fout, Alison R.
supporting information, p. 9805 - 9811 (2016/07/06)
The synthesis and characterization of a series of cobalt complexes featuring a pincer bis(carbene) ligand of the meta-phenylene-bridged bis-N-heterocyclic carbene (ArCCC, Ar = 2,6-diispropylphenyl or mesityl) are reported. Cleavage of the aryl C-H bond of the ligand was achieved in a one-pot metalation procedure using Co(N(SiMe3)2)2(py)2, an equivalent of exogenous base, and trityl chloride to form the (DIPPCCC)CoCl2py complex. This species could be reduced to the Co(ii) and Co(i)-N2 molecules with the appropriate equivalents of reductant. Subsequent generation of (MesCCC)CoI-III derivatives with the mesityl ligand proceeded in good yields. A suite of characterization techniques and the interconversion between all three oxidation states of the cobalt complexes is described.
Reactive 4a-alkyl-4aH-carbazoles by catalytic dearomatisation, and their unusual dimerisation and dealkylation reactions
Bedford, Robin B.,Butts, Craig P.,Haddow, Mairi F.,Osborne, Robert,Sankey, Rosalind F.
supporting information; experimental part, p. 4832 - 4834 (2009/12/08)
Despite their intrinsic instability, 4a-alkyl-4aH-carbazoles can be generated by a catalytic dearomatisation process; their reactivity is demonstrated by facile dealkylation and highly unusual cyclodimerisation processes.
