Mild and Efficient Allylation of Aldehydes by using Copper Fluorapatite as Catalyst

Kantam, M. Lakshmi; Venkanna, Gopaladasu T.; Kumar, K. B. Shiva; Venkateswarlu, G.; Sreedhar, B.

doi:10.1002/adsc.200800159

Cited by 12 publications

(8 citation statements)

References 77 publications

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“…The planned degree of substitution of Ca 2+ by Cu 2+ in the general formula Cu x .Ca (10 x) . (PO 4 ) 6 .F 2 was x = 0, 0.4, and 0.9 for which the product was designated as FA, 4CuFA, and 9CuFA, respectively. The overall reaction leading to the formation of the nanostructured copper-doped uorapatite is as follows:…”

Section: Powder Preparationmentioning

confidence: 99%

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Effect of Cu2+ ion on Biological Performance of Nanostructured Fluorapatite Doped with Copper

2017

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Abstract. Nanostructured copper-doped uorapatite (Cu x .Ca (10 x) .(PO 4 ) 6 .F 2 ) having crystallite sizes of 19, 29, and 34 nm at x = 0:9, 0.4, and 0.0, respectively, was synthesized by planetary ball milling of CaO, P2O5, CaF2, and CuO powders. Speci cations of the products were determined by Fourier-transform infrared spectroscopy, eld emission scanning electron microscopy, transmission electron microscopy, and X-ray di raction analyses. In-vitro studies and Mossman's Tetrazole Test (MTT) assays were also conducted by incubating Cu x .Ca (10 x) .(PO 4 ) 6 .F 2 powder into Kokubo's Simulated Body Fluid (SBF) and against BT-20 cell, respectively, to determine bioactivity and biocompatibility of the materials. Antibacterial e ects on Staphylococcus aureus were assessed by the disc di usion test method. Measurements showed that the rate of formation of uorapatite was lowered by Cu content. Besides, in-vitro experiments showed the same SBF interacted apatite precipitation for all samples. In contrast, MTT assays revealed di erent behavior for pure uorapatite and apatite with x = 0:9 Cu against BT-20 cell after 24 h of incubation. This highlights the increase of uorapatite cytotoxicity when Cu ion is present in the apatite structure. Copper-doped uorapatite was, however, desirably antibacterial. This stemmed from copper ions interactions with the bacterial metabolism which resulted in enzymes neutralization and copper-doped uorapatite antibacterial behavior.

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Section: Powder Preparationmentioning

confidence: 99%

“…(PO 4 ) 6 . F 2 ), known as an e ective, eco-friendly and heterogeneous catalyst in recent studies [5,6], is an interesting example of metal ion-substituted ceramic, which is to be discussed in this paper.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cu2+ ion on Biological Performance of Nanostructured Fluorapatite Doped with Copper

2017

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“…), [164,306] or with the help of homogeneous and heterogeneous main group and transition metal catalysts as activating agents (e.g. : mesoporous AlPO 4 , [307] I 2 or NaHSO 4 ·SiO 2 , [308] tungstates (MWO 4 ), [309] Cu 2 O, [304] nanocrystalline ZnO, zinc hydroxyapatite [310] ) to simultaneously testing all kinds of aprotic solvent systems. [163][164][165][166]311] In order to avoid formation of the toxic and explosive HN 3 , one passed on to more neutral or even slightly basic conditions, [169,312] to eventually arrive at the most efficient and economically friendly approach by Sharpless et al (and followers) using stoichiometric amounts of zinc(II) salts in water.…”

Section: Cleavage Of the Metal-tetrazole Bond: Tetrazole Synthesesmentioning

confidence: 99%

Azide Chemistry – An Inorganic Perspective, Part II^[‡][3+2]‐Cycloaddition Reactions of Metal Azides and Related Systems

Fehlhammer

Beck

2015

Zeitschrift anorg allge chemie

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Abstract. In whatever state of bonding -whether covalent to an organic residue or a heteroatom, or polar to ionic in contact with a metal -the azide moiety N 3 is characterized by its high potential of reactivity which essentially manifests itself in two basic processes: the elimination of dinitrogen and the entry into 1,3-dipolar cycloadditions with suitable dipolarophiles, the latter of which clearly predominates the chemistry of azide, also that of its metal compounds. In a preceding review entitled "Part I -Metal Azides: Overview, General Trends and Recent Developments" which was meant to lay the foundations for the present paper, these and other reactions have already been touched upon. The present review -Part II -now focusses in great detail on the formation of five-membered heterocyclestetrazol(at)es, triazol(at)es, triazolin(at)es, thiatriazol(at)es, etc. as well as various consecutive products -from azide and nitriles, isocyanides, alkynes, alkenes and heteroallenes (CS 2 , RN=C=S) in the ligand sphere of the metal. Generally, these [3+2]-cycloadditions are found to CONTENTS

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“…[62] The hydrogenation of nitroarenes is usually the method of choice for the production of these compounds [63] and many heterogeneous and homogeneous catalysts have been employed. [64][65][66][67] Recently, different supported catalysts containing palladium [67][68][69][70][71] or platinum [67,69, Reaction conditions: substrate = 0.50 mmol, H 2 O = 3 mL, T = 60°C, t = 20 h. a Determined by GC. b Experiment carried out by using the catalytic phase recovered from the previous reaction.…”

Section: Hydrogenation Of Nitroarenesmentioning

confidence: 99%

Alternative Recovery and Valorization of Metals from Exhausted Catalytic Converters in a New Smart Polymetallic Catalyst

et al. 2019

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A new metals‐polymeric composite, Metx‐EPS (I), was prepared to be used as catalyst in water or in two‐phase aqueous conditions. The metals source was an exhausted catalytic converter that was grinded and treated with an acidic solution at room temperature. After filtration, the solution was concentrated, neutralized and added to a broth of Klebsiella oxytoca DSM 29614 to produce (I) where metals are embedded in a peculiar polysaccharide structure (EPS). The composite was easily recovered from the fermentation broth and purified. The process protocol was verified many times and was shown to be reproducible satisfactorily. The % recovery of metals, originally present in the converter, was good as determined by atomic absorption. The morphology and the chemical state of main metals in (I) were investigated by X‐ray absorption spectroscopy methods (XANES and EXAFS). No metallic alloy seems to be evident. The catalytic activity and a possible synergic effect due to the presence of the different metals was valuated in the hydrogenation of some substrates, valuable precursors for the production of fine chemicals.

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Mild and Efficient Allylation of Aldehydes by using Copper Fluorapatite as Catalyst

Cited by 12 publications

References 77 publications

Effect of Cu2+ ion on Biological Performance of Nanostructured Fluorapatite Doped with Copper

Effect of Cu2+ ion on Biological Performance of Nanostructured Fluorapatite Doped with Copper

Azide Chemistry – An Inorganic Perspective, Part II^[‡][3+2]‐Cycloaddition Reactions of Metal Azides and Related Systems

Alternative Recovery and Valorization of Metals from Exhausted Catalytic Converters in a New Smart Polymetallic Catalyst

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Mild and Efficient Allylation of Aldehydes by using Copper Fluorapatite as Catalyst

Cited by 12 publications

References 77 publications

Effect of Cu2+ ion on Biological Performance of Nanostructured Fluorapatite Doped with Copper

Effect of Cu2+ ion on Biological Performance of Nanostructured Fluorapatite Doped with Copper

Azide Chemistry – An Inorganic Perspective, Part II[‡][3+2]‐Cycloaddition Reactions of Metal Azides and Related Systems

Alternative Recovery and Valorization of Metals from Exhausted Catalytic Converters in a New Smart Polymetallic Catalyst

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Azide Chemistry – An Inorganic Perspective, Part II^[‡][3+2]‐Cycloaddition Reactions of Metal Azides and Related Systems