Pincer complexes phosphino

We have found that the higher levels of conversion of cycloalkanes to arenes can be achieved with the iridium arsino pincer complex, IrH2(C5H3-2,6-(CH2AsBu 2)2) than are obtained with the analogous phosphino catalyst. However, inhibition of the arsino pincer catalyst is observed at the -20% dehydrogenation level for methylcyclohexane, decalin, and dicyclohexyl. 

PCP iridium pincer complexes are a well-studied and attractive class of compounds which promote important catalytic and stoichiometric processes. Although this class of compounds are also briefly discussed in the sections describing iridium hydrides (Section 7.04.6) and iridium catalyzed C-C bond-forming processes (Section 7.04.3.5), a few notes addressing their relevance in the chemistry of hydrocarbyl iridium complexes are here necessary. Both the neutral (PCP)Ir [PCP = 3-C6H3-2,6-(CH2PBu )2] and the cationic (PNP)Ir [PNP = 2,6-bis-(di-fet -butyl phosphino... 

Pincer (mer, tridentate) phosphines have proved resistant to degradation and useful in alkane dehydrogenation catalysis. Recently, Xu et al. [118] found that a dihydrido Ir complex containing a tridentate monoaifionic aryl bis(phosphino) (PCP) pincer, 31 (R = terf-butyl), is highly active catalyst for dehydrogenation... 

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