Chromium(VI) or Ruthenium(II) Complex Catalysis in Oxidation of Alcohols to Aldehydes and Ketones by Means of Bis(trimethylsilyl) Peroxide

Abstract

Bis(trimethylsilyl) peroxide (BTSP) serves as an effective oxidant of alcohols in the presence of chromium(VI) or ruthenium(II) complexes as catalysts in dichloromethane. Selective oxidation of primary alcohols in preference to secondary ones using RuCl2(PPh3)3 as a catalyst is also described.

Supported Ruthenium Catalyst for the Heterogeneous Oxidation of Alcohols with Molecular Oxygen

“…These faster oxidations of primary alcohols show that Ru–alcoholate II (see scheme ) is formed as an intermediate, since the formation of metal–alcoholate species is well known for such selective oxidation of primary hydroxy groups 23. 24 Competitive oxidations of para ‐substituted benzyl alcohols gave a Hammett ρ value of −0.461 ( r 2 =0.99; Figure 2), which suggests that hydride abstraction from II to form the carbocation‐type intermediate is involved in the oxidation path.…”

Untitled

“…These faster oxidations of primary alcohols show that Ru± alcoholate II (see scheme 1) is formed as an intermediate, since the formation of metal±alcoholate species is well known for such selective oxidation of primary hydroxy groups. [23,24] Competitive oxidations of para-substituted benzyl alcohols gave a Hammett 1 value of À0.461 (r 2 ¼ 0.99; Figure 2), which suggests that hydride abstraction from II to form the carbocationtype intermediate is involved in the oxidation path.…”

The Reaction of Aza Michael Catalyzed by Zeolite Cu-ZSM-5 under Solvent-Free Conditions

“…This great industrial applicability of zeolites can be linked to the exceptional versatility that these materials offer as solids whose structure and surface properties can be easily adapted. In this sense, zeolites [16][17][18][19] are micro porous materials with regular pores and cavities of molecular size (3-15 A) formed by heteroatom's in tetrahedral coordination (primary Si and Al) linked by atomic atoms. Oxygen.…”