Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 366, Issue -, Pages 210-214Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2012.09.025
Keywords
Heterogeneous catalysis; Transfer hydrogenation; Aqueous microemulsion; Palladium; Sustainable chemistry
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SCHO687/8-2]
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In the course of our attempts to replace harmful organic solvents used in organic processes by environmentally favored media, we investigated the transfer hydrogenation of various, unsaturated substrates by cyclohexene and similar water-insoluble hydrogen donors. The catalyst in these reactions was Pd(0) in form of nanoparticles, stabilized by hydrophobic silica so-gel which can be reused at least 4-6 times without significant loss of activity. The process was shown to depend on the electronic nature of the surfactants. Marlipal (R) 24/70 gave in most experiments the best results. Except for the hydrolysable 1-chloromethylnaphthalene, where chlorine can be substituted by a hydroxyl group, the aqueous medium does not take part in the catalytic process. (c) 2012 Elsevier B.V. All rights reserved.
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