W/HAP catalysed N-oxidation of tertiary amines with H2O2 as an oxidant

Abstract

Synthesis of several N -oxides with tungsten exchanged hydroxyapatite (W/HAP) in the presence of 30% hydrogen peroxide (H 2 O 2 ) as an oxidant is presented. A process with aqueous H 2 O 2 , a cheap and clean oxidant with an active catalyst is developed to reduce waste production and meet the requirements of green chemistry. Several tertiary amines have been efficiently oxidized to their corresponding N -oxides with excellent yields. The as-synthesized catalyst (W/HAP) is characterized using BET, FTIR, SEM, ICP-OES and XRD. Effect of catalyst loading , temperature and oxidants were studied. A kinetic model has been developed to determine the reaction rate at different temperatures and activation energy for the model reaction. Graphical abstract Synopsis. Synthesis of several N -oxides using tungsten exchanged hydroxyapatite (W/HAP) in the presence of 30% hydrogen peroxide (H 2 O 2 ) as an oxidant is presented. A process with aqueous H 2 O 2 , a cheap and clean oxidant with an active catalyst is developed to reduce waste production and meet the requirements of green chemistry. Supplementary Information The online version contains supplementary material available at 10.1007/s12039-022-02038-0.

Copper Fluorapatite-Catalyzed Aza-Michael Reaction and Kinetic Studies

“…The FTIR spectra (Figure 2) of all catalysts show PO 4 vibrational frequencies similar to that reported in the literature. 22,34,36 Different vibrational PO 4 3− groups are obtained from FTIR spectra. The stretching of the phosphate group in symmetric and asymmetric modes is 962 cm −1 as the symmetric stretching mode ν 1 and ν 3 , whereas the asymmetric stretching mode is from the band 1093 cm −1 .…”

Direct and Easily Prepared Nanocomposite Impurity-Free Hydroxyapatite from Locally Delivered Ckd as a Potent Catalyst for Trans-2-Butene Production

“…Over the last two decades, considerable research has been conducted on the use of HAPT as an active catalyst, either pure or as a catalyst support, in a variety of chemical reactions [20][21][22][23][24][25][26] . While none was conducted on the decomposition reactions of sec-butanol (SB), as a result, the work herein represents the rst successful attempt to use HAPT as an acidic catalyst to convert SB to trans-2-butene (t-2-butene) via single step alcohol dehydration.…”

“…Apart from its biomedical applications, HAPT has a variety of industrial applications as an active compound or catalyst, including catalytic oxidation of volatile organic compounds 20 , solventless selfaldol condensation of butyraldehyde to 2-ethylhexenal 21 , CO-oxidation reaction 22 and ethanol conversion 23 . Furthermore, HAPT is widely used as catalyst support in many reactions, such as: dry reforming of methane using HAPT supported nickel catalysts 24 , N-oxidation of tertiary amines with H 2 O 2 by W/HAPT 25 , and steam reforming of ethanol over cobalt supported HAPT 26 . Based on our tracing about the different uses of HAPT, as a heterogeneous catalyst, during the conversion of sec-butanol to trans-2-butene or any other products.…”

Imine Oxidation Catalyzed by Zinc Hydroxyapatite: Kinetic Studies

“…HAP is used in the dehydrogenation of hydrocarbons, CÀ C bond formation reactions, oxidation of alcohols, and reduction reactions such as hydrogenolysis. [40] Llopis et al reported synthesis of N,N-disubstituted formamides using 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) and H 2 O 2 . [41] Herein, we report an efficient ZnHAP catalyst for oxidation of benzylideneaniline with urea hydrogen peroxide and with a kinetic model validation.…”