Issue 25, 2016

Insight into the reaction mechanisms for oxidative addition of strong σ bonds to an Al(i) center

Abstract

The oxidation addition of a series of σ H–X bonds (X = H, B, C, Si, N, P, and O) to a single Al(I) supported by a (NacNac) bidentate ligand ((NacNac) = [ArNC(Me)CHC(Me)NAr] and Ar = 2,6-iPr2C6H3) has been explored through extensive DFT calculations. The presented results show that activation and addition of these σ bonds follow various reaction mechanisms, in which hydride transfer, proton transfer, and Al–X bond coupling steps are involved. The predicted free energy barriers for these oxidative additions range from 8 to 32 kcal mol−1, and all the reactions are remarkably favorable thermodynamically. However, sterically hindered ligands, for most reactants, make the formation of the initial reactant complex difficult and may reduce the efficiency of the reaction. Calculations reveal a strong dependence of the reaction mechanism and low-energy channel on the bonding features of X–H and the local structural environments.

Graphical abstract: Insight into the reaction mechanisms for oxidative addition of strong σ bonds to an Al(i) center

Supplementary files

Article information

Article type
Paper
Submitted
24 Mar 2016
Accepted
16 May 2016
First published
17 May 2016

Dalton Trans., 2016,45, 10355-10365

Insight into the reaction mechanisms for oxidative addition of strong σ bonds to an Al(I) center

X. Zhang and Z. Cao, Dalton Trans., 2016, 45, 10355 DOI: 10.1039/C6DT01154C

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