Thermoregulated phase-transfer cobalt catalyst for production of linear higher alcohols from C11–12 internal olefins in aqueous/organic biphasic system |
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Affiliation: | 1. Thermodynamics Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, Narmak, Tehran 16846-13114, Iran;2. Institute of Physical and Theoretical Chemistry, University of Regensburg, 93040 Regensburg, Germany |
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Abstract: | The thermoregulated phase-transfer cobalt catalyst, composed of a polyethylene glycol tailed phosphine ligand and cobalt carbonyl, has been applied for the conversion of normal C11–12 internal olefins into linear higher alcohols via hydroformylation and hydrogenation in an aqueous/organic biphasic system. Good catalyst activity (TOF = 2.2 h? 1) in this biphasic system was obtained which was as high as that in the homogeneous system where a cobalt catalyst was modified by a lipophilic phosphine ligand. Easy catalyst recovery has been done by phase decanting, and the aqueous phase with the cobalt catalyst was used directly in recycling. In 4 times of recycling tests, the yield of alcohols decreased slightly, the leaching of cobalt into the organic phase was less than 2.7% each time and a total catalyst TON of around 150 was obtained. |
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