Alternative energy input for transfer hydrogenation using iridium NHC based catalysts in glycerol as hydrogen donor and solvent
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comunitat-uji-handle2:10234/7053
comunitat-uji-handle3:10234/8639
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http://dx.doi.org/10.1021/om300109e |
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Title
Alternative energy input for transfer hydrogenation using iridium NHC based catalysts in glycerol as hydrogen donor and solventAuthor (s)
Date
2012Publisher
American Chemical SocietyISSN
0276-7333; 1520-6041Type
info:eu-repo/semantics/articlePublisher version
http://pubs.acs.org/doi/pdf/10.1021/om300109eAbstract
Four Ir(I) and Ir(III) N-heterocyclic carbene
(NHC) based complexes with 3,4,5-trimethoxybenzyl N-substituents have been obtained and fully characterized. The new
complexes have been used as catalysts in the reduction ... [+]
Four Ir(I) and Ir(III) N-heterocyclic carbene
(NHC) based complexes with 3,4,5-trimethoxybenzyl N-substituents have been obtained and fully characterized. The new
complexes have been used as catalysts in the reduction of aldehydes
and ketones with glycerol, and their activities have been compared
to those shown by other Ir(III) NHC-complexes previously
reported. The reactions were carried out under oil bath heating,
and a detailed comparative study has been carried out using
microwave (MW) and ultrasound (US) activation. The new Ir(III)
complexes proved to be most efficient in the reduction of ketones,
while the Ir(I) complexes are more active in the reduction of
aldehydes. The use of ultrasound has a tremendous impact in
shortening reaction times, and good results have been obtained in
the reduction of aldehydes. In some experiments transmision electron microscopy (TEM) and UV−vis analysis showed the
presence of iridium-containing nanoparticles after MW or US activation. [-]
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Organometallics 2012, 31 (10)Rights
© 2012 American Chemical Society
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