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

被引：23

作者：

Klahn, Marcus ^{[1
]}

Hollmann, Dirk ^{[1
]}

Spannenberg, Anke ^{[1
]}

Brueckner, Angelika ^{[1
]}

Beweries, Torsten ^{[1
]}

机构：

[1] Univ Rostock, Leibniz Inst Katalyse eV, D-18059 Rostock, Germany

来源：

DALTON TRANSACTIONS | 2015年 / 44卷 / 27期

关键词：

FRUSTRATED LEWIS PAIRS; AMMONIA-BORANE; PI-DONATION; DEHYDROCOUPLING/DEHYDROGENATION; METAL; REGENERATION; TITANIUM(III); REACTIVITY; HYDRAZINE; CLEAVAGE;

D O I：

10.1039/c5dt00275c

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A study of the dehydrogenation of dimethylamine borane using different titanocene(III) complexes with 2-phosphinoaryloxide ligands is presented. Complexes Cp2Ti(kappa(2)-O, P-O-C6H4-PR2) (3a: R = i-Pr, 3b: R = Ph) (Cp = eta(5)-cyclopentadienyl) and Cp*Ti-2(kappa(1)-O-O-C6H4-PR2) (5a: R = i-Pr, 5b: R = Ph) (Cp* = eta(5)-penta-methylcyclopentadienyl) 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.

引用

页码：12103 / 12111

页数：9

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