Issue 45, 2018

H2 addition to (Me4PCP)Ir(CO): studies of the isomerization mechanism

Abstract

Reduced steric demand of the Me4PCP pincer ligand (PCP = κ3-C6H4-1,3-[CH2PR2]2, R = Me), allows for a more open metal center. This is evident through structure and reactivity comparisons between (Me4PCP)Ir derivatives and other (R4PCP)Ir complexes (R = tBu, iPr, CF3). In particular, isomerization from cis-(R4PCP)Ir(H)2(CO) to trans-(R4PCP)Ir(H)2(CO) is more facile when R = Me than when R = iPr. Deuterium incorporation in the hydride ligands from solvent C6D6 was observed during this isomerization when R = Me. This deuterium exchange has not been observed for other analogous R4PCP iridium complexes. A kinetic study of the cis/trans isomerization combined with computational studies suggests that the cis/trans isomerization proceeds through a migratory-insertion pathway involving a formyl intermediate.

Graphical abstract: H2 addition to (Me4PCP)Ir(CO): studies of the isomerization mechanism

Supplementary files

Article information

Article type
Paper
Submitted
13 jul. 2018
Accepted
05 oct. 2018
First published
11 oct. 2018

Dalton Trans., 2018,47, 16119-16125

Author version available

H2 addition to (Me4PCP)Ir(CO): studies of the isomerization mechanism

T. T. Lekich, J. B. Gary, S. M. Bellows, T. R. Cundari, L. M. Guard and D. M. Heinekey, Dalton Trans., 2018, 47, 16119 DOI: 10.1039/C8DT02861C

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