Ruthenium bidentate phosphine complexes for the coordination and catalytic dehydrogenation of amine- and phosphine-boranes.

Ruthenium bidentate phosphine complexes for the coordination and catalytic dehydrogenation of amine- and phosphine-boranes.
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二齿膦钌配合物,用于胺硼烷和膦硼烷的配位和催化脱氢。

DOI:
10.1002/chem.201100101
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发表时间:
2011
期刊:
Chemistry (Weinheim an der Bergstrasse, Germany)
影响因子:
--
通讯作者:
Ledger AE
Ledger AE
中科院分区:
--
文献类型:
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作者:
Ledger AE

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胺硼烷H3 B·NH 2 tBu、H3 B·NHMe 2和H3 B·NH3与阳离子钌片段[Ru]的加成(xantphos)(PPh3)(OH2)H][BArF4](2; xantphos= 4,5-双(二苯基膦基)-9,9-二甲基氧杂蒽; BArF 4 =[B{3,5-(CF 3)2C 6 H3}4]-)得到η1-B-OH键合的胺-硼烷配合物[Ru(xantphos)(PPh3)(H3B = NH2tBu)H][BArF4](5)、[Ru(xantphos)(PPh3)(H3B = NHMe2)H][BArF4](6)和[Ru(xantphos)(PPh3)(H3B = NH3)H][BArF4](7)。分别用[BArF 4]和[BPh 4]阴离子测定了5和7的X射线晶体结构。用H3 B-PHPh 2处理2导致完全不同的行为,发生B-PHPh 2相互作用的裂解,生成结构特征为双仲膦络合物[Ru(xantphos)(PHPh 2)2 H][BPh 4](9)。xantphos配合物2、5和9被证明是催化H3 B → NHMe 2脱氢的不良前体。虽然dppf物种(dppf= 1,1 ′-双(二苯基膦基)二茂铁)[Ru(dppf)(PPh 3)HCl](3)和[Ru(dppf)(η6-C6 H5 PPh 2)H][BArF 4](4)显示出更好的,但仍然中等的活性,但Agostic稳定的N-杂环卡宾衍生物[Ru(dppf)(ICy)HCl](12; ICy= 1,3-二环己基咪唑-2-亚基)被证明是最有效的催化剂,在室温下的转换数为76 h− 1。 
Addition of the amine–boranes H3B⋅NH2tBu, H3B⋅NHMe2and H3B⋅NH3to the cationic ruthenium fragment [Ru(xantphos)(PPh3)(OH2)H][BArF4] (2; xantphos=4,5‐bis(diphenylphosphino)‐9,9‐dimethylxanthene; BArF4=[B{3,5‐(CF3)2C6H3}4]−) affords the η1‐BH bound amine–borane complexes [Ru(xantphos)(PPh3)(H3B⋅NH2tBu)H][BArF4] (5), [Ru(xantphos)(PPh3)(H3B⋅NHMe2)H][BArF4] (6) and [Ru(xantphos)(PPh3)(H3B⋅NH3)H][BArF4] (7). The X‐ray crystal structures of5and7have been determined with [BArF4] and [BPh4] anions, respectively. Treatment of2with H3B⋅PHPh2resulted in quite different behaviour, with cleavage of the BP interaction taking place to generate the structurally characterised bis‐secondary phosphine complex [Ru(xantphos)(PHPh2)2H][BPh4] (9). The xantphos complexes2,5and9proved to be poor precursors for the catalytic dehydrogenation of H3B⋅NHMe2. While the dppf species (dppf=1,1′‐bis(diphenylphosphino)ferrocene) [Ru(dppf)(PPh3)HCl] (3) and [Ru(dppf)(η6‐C6H5PPh2)H][BArF4] (4) showed better, but still moderate activity, the agostic‐stabilised N‐heterocyclic carbene derivative [Ru(dppf)(ICy)HCl] (12; ICy=1,3‐dicyclohexylimidazol‐2‐ylidene) proved to be the most efficient catalyst with a turnover number of 76 h−1at room temperature.
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