Supported Rh-phosphine complex catalysts for continuous gas-phase decarbonylation of aldehydes

Abstract

Heterogeneous silica supported rhodium-phosphine complex catalysts are employed for the first time in the catalytic decarbonylation of aldehydes in continuous gas-phase. The reaction protocol is exemplified for the decarbonylation of p-tolualdehyde to toluene and further extended to other aromatic and aliphatic aldehydes achieving excellent results in terms of both conversion and selectivity.

Cerium oxide as a catalyst for the ketonization of aldehydes: mechanistic insights and a convenient way to alkanes without the consumption of external hydrogen

“…Aldehydes might also be decarbonylated, forming an alkane (or arene) and carbon monoxide. Although in general metal catalysis is required for this reaction, [35][36][37][38] the high temperature employed in the present case may also facilitate it. Therefore, the corresponding product hexane was monitored.…”

Forging C–S Bonds through Nickel-Catalyzed Aryl Anhydrides with Thiophenols: Decarbonylation or Decarbonylation Accompanied by Decarboxylation

“…In recent years, the method of constructing C–S bonds by decarbonylation has attracted people’s attention. Many research groups have explored the principle of decarbonylation and used several excellent transition metals such as Pd, Rh, Ir, and Ni to drive the reaction forward. In recent years, there has been an increasing interest in nickel catalysis because of its nontoxicity, environmentally friendliness, and lower price.…”

Heterogeneously Catalyzed Selective Decarbonylation of Aldehydes by CeO2-Supported Highly Dispersed Non-Electron-Rich Ni(0) Nanospecies

“…For instance, aldehyde decarbonylation was utilized for the synthesis of FR-900482, a mitomycin-like antitumor agent, and (−)-presilphiperfolan-8-ol, a strained natural product. A variety of catalysts have been produced − since Eschinazi reported the first decarbonylation of aldehydes employing a Pd catalyst . The common mechanism of aldehyde decarbonylation is oxidative addition of coordinated aldehydes to a metal catalyst, followed by carbon monoxide (CO) extrusion and reductive elimination to produce a decarbonylated product.…”

“…The catalyst is then regenerated by the CO desorption step to achieve the catalytic cycle (Scheme a). Expensive noble metal catalysts such as Pd, − Ru, , Ir, , and Rh , have been mainly employed for the aldehyde decarbonylation, as predicted by the mechanism (Scheme a) . Even in a recent review, almost all of the introduced aldehyde decarbonylation reactions utilize such noble metal catalysts.…”