89509-84-2Relevant academic research and scientific papers
Selective stoichiometric and catalytic C-H bond cleavage reactions in hydrocarbons by iridium complexes
Burk, Mark J.,Crabtree, Robert H.,Parnell, Charles P.,Urlarte, Richard J.
, p. 816 - 817 (2008/10/08)
Complexes of the type [IrH2S2L2]A (S = Me2CO; L = PPh3 or (p-FC6H4)3P; A = SbF6), in the presence of t-BuCH=CH2 (tbe) at 85-150°C, can aromatize cyclohexanes to arenes and dehydrogenate cyclopentanes to cyclopentadienyl complexes of the type [IrCpHL2]A in good to excellent yields. The intermediates [IrH(η5-C6H7)L2]A and [Ir(η6-C6H6)L2]A are observed in the cyclohexane case. Cyclooctane is dehydrogenated to [Ir(cod)L2]A, but the addition of base leads to the catalytic formation of free cyclooctene instead. Cyclohexenes can be catalytically aromatized. In some cases, benzene (L = PPh3) or fluorobenzene (L = (FC6H5)3P) is formed in a side reaction involving P-C hydrogenolysis.
