[RuCl₂(p-cymene)]₂ on Carbon:  An Efficient, Selective, Reusable, and Environmentally Versatile Heterogeneous Catalyst

Abstract

[reaction: see text] A heterogeneous ruthenium catalyst, easily prepared by adsorption of [RuCl(2)(p-cymene)](2) on activated carbon, exhibited a highly efficient and selective catalytic activity in various environmentally attractive transformations such as aerobic oxidation, hydrolytic oxidation, and dehydration processes with excellent recyclability.

A Tungsten–Tin Mixed Hydroxide as an Efficient Heterogeneous Catalyst for Dehydration of Aldoximes to Nitriles

“…[17] The dehydration hardly proceeded in the absence of catalysts ( 4 , and a physical mixture of WO 3 and Sn(OH) 4 were not effective for the dehydration (Table 1, entries 5-8). According to our experiments, previously reported solid catalysts such as montmorillonite, [12] KF/Al 2 O 3 , [15] and [{RuCl 2 (p-cymene)} 2 ]/C [11] were not effective for dehydration under the present conditions (Table 1, entries 14-16). In the case of montmorillonite, benzaldehyde was obtained as a main product (73 % selectivity).…”

“…Although heterogeneous dehydration systems are environmentally and technologically the most desirable procedures, widely usable truly heterogeneous catalysts are unprecedented (see Table 1 and the Supporting Information). [11][12][13][14][15] Herein, we report that a tungsten-tin mixed hydroxide (W-Sn hydroxide, Sn/W molar ratio of 1.9), prepared by the simple coprecipitation method (see the Experimental Section), can act as a reusable heterogeneous catalyst for the dehydration of various aldoximes to the corresponding nitriles [Eq. (1)].…”

Water as green oxidant: a highly selective conversion of organosilanes to silanols with water

“…The recyclability [35] of the Pt-nanocluster catalyst is an important additional advantage over homogeneous catalysis. The recyclability of the present catalysts was also tested.…”

One step microwave-assisted synthesis of nanocrystalline WOx–ZrO2 acid catalysts

“…23 24 However the use of a heterogeneous catalyst may be a step forward towards an eco-friendly process. In this sense, some heterogeneous catalysts have been reported, 25 but they usually involve precious (Ru) 26 or toxic (Sn) 27 elements.…”