Catalysis by hydroxyapatite alone and modified by sodium nitrate: a simple and efficient procedure for the construction of carbon-nitrogen bonds in heterogeneous catalysis

Abstract

Application of hydroxyapatite modified by sodium nitrate as heterogeneous catalysts for the Michael type addition reaction of aliphatic and aromatic amines to α,β-unsaturated carbonyl compounds is presented. Modifying hydroxyapatite by sodium nitrate significantly enhances the rate and yield of the reaction. This catalyst is used as the catalyst for a facile synthesis of β-amino acid under heterogeneous conditions.

Iron-Doped Mesoporous Powders of Hydroxyapatite as Molybdenum-Impregnated Catalysts for Deep Oxidative Desulfurization of Model Fuel: Synthesis and Experimental and Theoretical Studies

“…HA has also found great importance as an adsorbent, including for water purification, and as a catalyst or catalyst support . Thus, HA and its substituted forms have shown activity as a catalyst in condensation reactions, including Knoevenagel, , Kleisen-Schmidt, and Michael addition. , The activity, selectivity, and stability of cation-substituted HAs in multicomponent reactions, including the reactions of alkylation, transesterification, hydroformylation, hydrogenolysis, hydrogenation, and hydration of nitriles, were shown to be significant successes in the oxidation of alcohols and silanols, epoxidation, and oxidative dehydrogenation of ethane and propane . Investigating various forms of HAs for biomedical applications by electron paramagnetic resonance (EPR) combined with density functional theory (DFT) calculations , as complementary tools to other analytical techniques has shown their effectiveness in being able to describe the structure of paramagnetic centers in anion- and cation-substituted HAs.…”

Enhancement of photocatalytic efficacy by exploiting copper doping in nano-hydroxyapatite for degradation of Congo red dye

“…One of the main fields of application of HAp is photocatalysis. A few important applications of HAp as a catalyst are the degradation of methylene blue (MB) and doxycycline drug, 1 and volatile organic compounds, 2 the deoxygenation of bio-oil, 3 the conversion of lignin derivatives into small molecular acids, 4 the degradation of bisphenol A, 5 the formation of carbon–nitrogen bonds, 6 the synthesis of alkenes, 7 the oxidation of silanes, 8 etc. HAp singly or in combination with other materials is widely utilized to degrade organic pollutants.…”

Aqueous Microgels for the Growth of Hydroxyapatite Nanocrystals

“…In this way, the polymeric matrix plays an important role in the nucleation and growth of HAp crystals and determines their size, morphology, and orientation in the composite material. The most important application fields for hybrid materials containing HAp are tissue engineering, implants, drug delivery systems, , catalysis, , adsorbents, and protein chromatography. , …”

“…5 In this way, the polymeric matrix plays an important role in the nucleation and growth of HAp crystals and determines their size, morphology, and orientation in the composite material. The most important application fields for hybrid materials containing HAp are tissue engineering, 6 implants, 3 drug delivery systems, 7,8 catalysis, 9,10 adsorbents, 11 and protein chromatography. 12,13 A large variety of polymeric materials have been used as templates for the synthesis of HAp such as protein collagen, 14 poly(L-lactic acid), 15 poly(aspargic acid), 16 alginates, 17 gelatine, 18 chitosan, 4,5,19 chitin, 20 dendrimers, 21,22 hydrogels, [23][24][25][26] and so forth.…”