Titanosilicate (TS-1) Catalyzed Oxidation of Aromatic Aldehydes to Esters

Abstract

A facile conversion of aromatic aldehydes to esters using molecular sieves, TS-1, and 30% H 2 O 2 is described.

One pot oxidative esterification of aldehyde over recyclable cesium salt of nickel substituted phosphotungstate

“…A c c e p t e d M a n u s c r i p t 3 Then after almost 22 years, studies began in 1989. There are number of reports available on synthesis and characterization of mono nickel substituted phosphotungstate, consisting of different salts such as TBA, potassium and Octadecyl trimethylammonium chloride following two step synthesis [17][18][19][20][21][22][23][24][25][26].…”

“…A literature survey also shows that only Mansouri group [27], had reported synthesis of Keggin type Cs salt of PW 11 Ni following the same procedure [16] with a modification. The modification includes the treatment of potassium salt of K 7 PW 11 .xH 2 O with an aqueous solution of M(NO) 3 , M =Ni and addition of cesium chloride under refluxing condition followed by filtration and washing with an ethanol/H 2 O (1/1) mixture and dried at 353 K. They also reported the catalytic application of the synthesized material for partial oxidation of methane. Thus, a literature survey shows that there is only one report on the synthesis of CsPW 11 Ni.…”

“…Recently, various groups have reported oxidative esterification of aldehydes based on supported Gold-Nickel Oxide (AuNiOx) [2], TS-1 [3], V 2 O 5 -H 2 O 2 [4], supported gold nanoparticle Au/TiO 2 [5], Pb and Mg doping in Al 2 O 3 -supported Pd [6], ionic liquid BmimBF 4 [7], manganese phthalocyanine immobilized on silica gel [8]. Reports are also available using 12-tungstophosphoric acid immobilized on the surface of silica encapsulated γ-Fe 2 O 3 nanoparticles [9], imidazolium polyoxometalate [bmim] 3 [PW 12 O 40 ] [10], 12-tungstophosphoric acid and lacunary phosphotungstate anchored to MCM-41 and ZrO 2 [11].…”

“…Reports are also available using 12-tungstophosphoric acid immobilized on the surface of silica encapsulated γ-Fe 2 O 3 nanoparticles [9], imidazolium polyoxometalate [bmim] 3 [PW 12 O 40 ] [10], 12-tungstophosphoric acid and lacunary phosphotungstate anchored to MCM-41 and ZrO 2 [11].…”

The Effect of Indium(III) Triflate in Oxone-Mediated Oxidative Methyl Esterification of Aldehydes

“…Although a couple of the esterifying transformations of aldehydes using metal-based reagents have been reported, including iridium, [3][4][5] rhenium, 6) ruthenium, 7) rhodium, 8) palladium, 9,10) manganese, 11) iron, 12) copper, 13) tin, 14) and pyridinium dichromate (PDC), 15,16) those heavy/transition metal oxidants might not be sufficiently environmentally benign. As a consequence, esterification methodologies employing H 2 O 2 and catalytic amounts of metal-based reagents, such as titanosilicate, 17) vanadium pentoxide, 18,19) iron salt, and zinc salt, 20,21) have been introduced. However, in many cases, the reagents are limited by the use of H 2 O 2 with the combination of fourth-row transition elements.…”