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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Recoverable and recyclable water-soluble sulphonated salicylaldimine Rh(I) complexes for 1-octene hydroformylation in aqueous biphasic media
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Recoverable and recyclable water-soluble sulphonated salicylaldimine Rh(I) complexes for 1-octene hydroformylation in aqueous biphasic media

机译：可回收和可循环使用的水溶性磺化水杨醛亚胺Rh（I）络合物，用于双相介质中的1-辛烯加氢甲酰化

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摘要

A series of water-soluble Rh(I) mononuclear complexes of general formula: [Rh(sulphsal-X-R)(COD)] [sulphsal = sulphonated salicylaldimine, COD = cyclooctadiene; where R = H, Cl, CH3 and X = H, Bu-t] have been synthesized. All the compounds were characterised using various spectroscopic and analytical techniques such as nuclear magnetic resonance spectroscopy, infrared spectroscopy, single crystal X-ray diffraction (for complex 10) and mass spectrometry. All the compounds display excellent water-solubility at room temperature and were tested as catalyst precursors in the aqueous biphasic hydroformylation of 1-octene. The catalysts could be easily recovered by phase separation and were used up to 5 times without any significant loss in activity and 1-octene conversion. Very high yields of the expected aldehydes were obtained without addition of any phase transfer agents, co-solvents or hydrophobic ligands. Excellent aldehyde chemoselectivity is observed for all the catalysts but this varied each time the catalysts were recycled, with the formation of a small amount of internal olefins. ICP-OES and mercury poisoning experiments show that a combination of homogeneous catalysis and catalysis mediated by nanoparticles is taking place in these systems.
机译：一系列通式为：[Rh（硫代-X-R）（COD）]的水溶性Rh（I）单核配合物[硫代=磺化水杨基亚胺，COD =环辛二烯;其中R ＝ H，Cl，CH 3和X ＝ H，Bu-t]已经合成。所有化合物均使用各种光谱和分析技术进行了表征，例如核磁共振光谱，红外光谱，单晶X射线衍射（对于配合物10）和质谱。所有化合物在室温下均显示出优异的水溶性，并在1-辛烯的水相双相加氢甲酰化反应中作为催化剂前体进行了测试。催化剂可通过相分离容易地回收，并且使用多达5次，而活性和1-辛烯转化率没有任何明显的损失。在不添加任何相转移剂，助溶剂或疏水性配体的情况下，获得了很高的预期醛收率。对于所有催化剂都观察到优异的醛化学选择性，但是每次催化剂循环使用时都会发生变化，并形成少量的内烯烃。 ICP-OES和汞中毒实验表明，在这些系统中均发生了均相催化和纳米颗粒介导的催化的结合。

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