Details

Autor(en) / Beteiligte

• Samanta, Partha Kumar
• Ray, Shounak
• Das, Trisha
• Gage, Samuel H.
• Nandi, Mahasweta
• Richards, Ryan M.
• Biswas, Papu

Titel

Palladium oxide nanoparticles intercalated mesoporous silica for solvent free acceptorless dehydrogenation reactions of alcohols

Ist Teil von

• Microporous and mesoporous materials, 2019-08, Vol.284, p.186-197

Ort / Verlag

Elsevier Inc

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• Aggregation-free well-dispersed palladium oxide nanoparticles intercalated into the walls of mesoporous silica (PdOMS) were prepared by using thioether groups during the sol-gel preparation of mesoporous silica. The PdOMS material was characterized by N2 adsorption-desorption, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and UV–Vis spectroscopy. The material retains mesoporous structure with narrow pore size distribution with an average pore diameter of 6.8 nm and possesses high surface area of 683 m2g–1. The PdOMS catalyst was employed as an efficient heterogeneous catalyst in the acceptor- and oxidant-free dehydrogenation of neat alcohols to corresponding carbonyl compounds in very good to excellent yields (72–95%) at 80 °C under inert atmosphere. The catalytic efficacy of PdOMS has also been evaluated for the acceptorless dehydrogenative coupling reactions of alcohols with o-diamino benzene and o-amino phenol to yield azole-based heterocycles. The stability of PdOMS was assessed by investigating its recyclability and reusability in the dehydrogenation of neat alcohol for up to five cycles. Aggregation-free well-dispersed palladium oxide nanoparticles intercalated into the walls of mesoporous silica (PdOMS) were synthesized for acceptor- and oxidant-free dehydrogenation of neat alcohols to corresponding carbonyl compounds and acceptorless dehydrogenative coupling reactions of alcohols with o-diamino benzene and o-amino phenol to yield azole based heterocycles. [Display omitted] •Highly dispersed PdO nanoparticles intercalated into walls of mesoporous silica.•Heterogeneous, airstable and reusable catalyst.•Solvent free AAD without over oxidation, sole byproduct-H2 gas.•Mild reaction condition with excellent functional group tolerance.•Cascade synthesis of 2-substituted benzoxazole or benzimidazole through AAD.