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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Hydroboration of carbon dioxide with catecholand pinacolborane using an Ir- CNP* pincer complex. Water influence on the catalytic activity
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Hydroboration of carbon dioxide with catecholand pinacolborane using an Ir- CNP* pincer complex. Water influence on the catalytic activity

机译:使用IR-CNP *钳子复合物用CateCholand Pinacolborane水散流。 对催化活性的影响

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摘要

Iridium complexes based on deprotonated lutidine-derived CNP* pincers 2a/2b selectively catalyzed the hydroboration of CO2 under mild conditions (1-2 bar CO2, 30 degrees C) to methoxyborane using HBcat (TOF up to 56 h(-1)) and to the formate level with HBpin (TOF up to 1245 h(-1)). Interestingly, an intriguing, positive water effect on the reaction rates has been observed. NMR spectroscopy and ESI-MS analysis of the hydroboration reactions have shown the formation of ligand-protonated [Ir(CNP)(CO)(BR2)H][B(R-2)(2)] (R-2 = catecholate, pinacolate) derivatives under catalytic conditions. Control experiments, however, have demonstrated that these derivatives are not catalytically competent species in the hydroboration of CO2.
机译:基于去质子化的Lutidine衍生的CNP *钳子2a / 2b的铱配合物在温和条件下选择性地催化CO 2的氢化物(1-2巴CO 2,30℃)与使用HBCAT(TOF高达56小时(-1))的甲氧基硼烷 用HBPIN(TOF高达1245小时(-1))到甲酸水平。 有趣的是,已经观察到对反应速率的有趣阳性效应。 NMR光谱和ESI-MS分析的水化反应显示了配体质子化[IR(CNP)(CO)(BR2)H] [B(R-2)(2)]的形成(R-2 =儿茶酸盐, 催化条件下的衍生物衍生物。 然而,对照实验表明,这些衍生物在CO 2的水中不是催化称重的物种。

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