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Issue 27, 2015
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Titanocene(iii) complexes with 2-phosphinoaryloxide ligands for the catalytic dehydrogenation of dimethylamine borane

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Abstract

A study of the dehydrogenation of dimethylamine borane using different titanocene(III) complexes with 2-phosphinoaryloxide ligands is presented. Complexes Cp2Ti(κ2-O, P-O-C6H4-PR2) (3a: R = i-Pr, 3b: R = Ph) (Cp = η5-cyclopentadienyl) and Cp*2Ti(κ1-O-O-C6H4-PR2) (5a: R = i-Pr, 5b: R = Ph) (Cp* = η5-pentamethylcyclopentadienyl) were prepared by reactions of the 2-phosphinophenol ligand with different titanocene sources and fully characterised. Their catalytic activity depends on the steric influence of the cyclopentadienyl ligand, the coordination mode of the 2-phosphinoaryloxide ligand and on the used solvent. Complex 3a showed a turnover number of 43.2 in the neat substrate after 24 hours. EPR investigations were used to elucidate the fate of the Ti(III) catalyst.

Graphical abstract: Titanocene(iii) complexes with 2-phosphinoaryloxide ligands for the catalytic dehydrogenation of dimethylamine borane

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Supplementary files

Article information


Submitted
20 Jan 2015
Accepted
18 Mar 2015
First published
23 Mar 2015

Dalton Trans., 2015,44, 12103-12111
Article type
Paper

Titanocene(III) complexes with 2-phosphinoaryloxide ligands for the catalytic dehydrogenation of dimethylamine borane

M. Klahn, D. Hollmann, A. Spannenberg, A. Brückner and T. Beweries, Dalton Trans., 2015, 44, 12103
DOI: 10.1039/C5DT00275C

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