- A new class of heterogeneous platinum catalysts for the chemoselective hydrogenation of nitroarenes
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A new series of nanostructured platinum catalysts able to catalyze the selective reduction of nitroarenes has been developed. The materials, made of organosilica physically doped with nanostructured platinum(0), are stable and efficient. Reactions in general proceed with high yield and often go to completion, while the catalysts can be reused in further reaction runs. This establishes a new class of relevant solid catalysts for synthetic organic chemistry named SiliaCat Platinum-Hydrogel.
- Pandarus, Valerica,Ciriminna, Rosaria,Beland, Francois,Pagliaro, Mario
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scheme or table
p. 1306 - 1316
(2011/06/25)
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- Dehydroamination Reaction of 9-Amino-9,10-dihydrophenanthrene and Related Compounds by Thermolysis
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Dehydroamination of 9-alkylamino-9,10-dihydrophenanthrene occurred at 190 - 250 deg C under non-basic conditions to give phenanthrene exclusively.The thermal reaction of cis-9-t-butylamino-10-methoxy-9,10-dihydrophenanthrene gave both 9-methoxyphenanthrene and 9-t-butylaminophenanthrene, while 9-aminophenanthrene was obtained from the thermal reaction of 9-amino-10-methoxy-9,10-dihydrophenanthrene.The thermal reaction of 9-amino-9,10-dihydroanthracene gave both anthracene and 9-aminoanthracene.Analysis of activation energies and frequency factors showed that the dehydroamination proceeds via an intramolecular proton transfer from C-10 to the amino group and subsequent C-N bond cleavage.
- Yasuda, Masahide,Harada, Takamitsu,Ansho, Yasuhiro,Shima, Kensuke
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p. 1451 - 1455
(2007/10/02)
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