Ferric hydroxide supported gold subnano clusters or quantum dots: enhanced catalytic performance in chemoselective hydrogenation was written by Liu, Lequan;Qiao, Botao;Ma, Yubo;Zhang, Juan;Deng, Youquan. And the article was included in Dalton Transactions in 2008.Category: tetrahydropyran This article mentions the following:
Ferric hydroxide supported Au subnano-clusters were prepared via modified co-precipitation without any calcination. High resolution TEM (HRTEM), x-ray diffraction, and XPS were used to study the structure and chem. states of these Au catalysts. No Au species could be observed in the HRTEM image nor from the x-ray diffraction pattern, suggesting that the size of the Au species in and on the ferric hydroxide support was less than or around 1 nm. Chemoselective hydrogenation of aromatic nitro compounds and α,β-unsaturated aldehydes was selected as a probe reaction to examine the catalytic properties of this catalyst. Under the same reaction conditions, such as 100° and 1 MPa H2 in the hydrogenation of aromatic nitro compounds, a 96-99% conversion (except for 4-nitrobenzonitrile) with 99% selectivity were obtained over the ferric hydroxide supported Au catalyst, and the TOF [turnover frequency] was 2-6 times higher than that of the corresponding ferric oxide supported catalyst with 3-5 nm size Au particles. For further evaluation of this Au catalyst in the hydrogenation of citral and cinnamaldehyde, selectivity towards unsaturated alcs. was 2-20 times higher than that of the corresponding ferric oxide Au catalyst. In the experiment, the researchers used many compounds, for example, 5,6-Dihydro-2H-pyran-3-carbaldehyde (cas: 13417-49-7Category: tetrahydropyran).
5,6-Dihydro-2H-pyran-3-carbaldehyde (cas: 13417-49-7) belongs to tetrahydropyran derivatives. Tetrahydropyrans and furans principally constitute as a central motif in diverse medicinally privileged molecules. 2-(Arylmethylene)cyclopropylcarbinols could be converted to the corresponding tetrahydropyrans stereoselectively in the presence of Brønsted acids under mild conditions. A plausible Prins-type reaction mechanism has been proposed.Category: tetrahydropyran
Referemce:
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics