ChemInform Abstract: 1,6,11,16‐TETRAAZAPORPHYRINOGEN, SYNTHESIS AND BEHAVIOR

Fifani, J.; Ramdani, Abdelkrim; Tarrago, G.

doi:10.1002/chin.197811325

Cited by 12 publications

(12 citation statements)

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“…(1.5-Dimethyl-1H-pyrazol-3-yl) methanol [62,63] (1.2 g, 9.52 mmol) was dissolved in 1,4-dioxane (100 mL). Activated manganese dioxide (21.88 g) was added to the solution and the suspension was stirred under reflux for 5 h. The reaction was monitored by TLC (alumina, CH 2 Cl 2 as eluent).…”

Section: Methodsmentioning

confidence: 99%

Organically Modified Silica with Pyrazole-3-carbaldehyde as a New Sorbent for Solid-Liquid Extraction of Heavy Metals

et al. 2013

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Abstract:A new chelating matrix, SiNP, has been prepared by immobilizing 1.5-dimethyl-1H-pyrazole-3-carbaldehyde on silica gel modified with 3-aminopropyltrimethoxysilane. This new chelating material was well characterized by elemental analysis, FT-IR spectroscopy, cross polarization magic angle spinning solid state 13 C-NMR, nitrogen adsorption-desorption isotherm, BET surface area, BJH pore size, and scanning electron microscopy (SEM). The new product exhibits good chemical and thermal stability as determined by thermogravimetry curves (TGA). The new prepared material was used as an adsorbent for the solid-phase extraction (SPE) of Pb(II), Cd(II), Cu(II) and Zn(II) from aqueous solutions using a batch method, prior to their determination by flame OPEN ACCESSMolecules 2014, 19 248 atomic adsorption spectrometry. The adsorption capacity was investigated using kinetics and pH effects. Common coexisting ions did not interfere with separation and determination.

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Section: Methodsmentioning

confidence: 99%

Organically Modified Silica with Pyrazole-3-carbaldehyde as a New Sorbent for Solid-Liquid Extraction of Heavy Metals

et al. 2013

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“…23 Alkylation of compound 2 with ethylbromoacetate in THF was carried out under solid-liquid phase transfer catalysis to favour the -isomer. 27 Thus, one isolated major product 3 as the -isomer was formed in 20% yield. The second positional isomer 4 was also isolated but with a very low yield (1%).…”

Section: Resultsmentioning

confidence: 99%

New Functionalised C,C-pyridylpyrazoles: Synthesis and Cation Binding Properties

Radi

Attayibat

Ramdani

et al. 2009

Journal of Chemical Research

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The synthesis of two new C,C-pyridylpyrazole isomers with a functionalised arm is described. The complexation capabilities of these ligands compared to their homologues towards bivalent metals (Hg 2+ , Cd 2+ , Pb 2+ , Cu 2+ , Zn 2+ ) and alkali metal ions (K + , Na + , Li + ) were investigated using a liquid-liquid extraction process. The percentage limits of extraction were determined by atomic absorption measurements.Chelating ligands based on the pyrazole ring have been described extensively in the literature 1-6 including several reviews. 7-9 In our recent work, a series of acyclic pyrazole compounds containing one, two, three or four pyrazole rings were prepared and demonstrated to extract only transition metal cations, 10-15 whereas macrocyclic pyrazolic compounds are expected to also form stable complexes with alkali metals. [16][17][18] This aptitude is mainly due to the presence of sp 2 hybrid nitrogen donors with the involvement of geometry and the nature of the ligands.Pyrazole-associated pyridine groups showed also the ability to complex transition metal ions. [19][20][21][22][23][24] However, complexation studies of pyridylpyrazole compounds are less well-known in the literature. It was therefore interesting to increase the diversity of pyridylpyrazole-based ligands with a view to study their complexation capabilities compared to ligands with pyrazoles units only.Here, we report the synthesis of two new C,C-pyridylpyrazole isomers 5 and 6 ( Fig. 1) with a donor heteroatom in a side chain. The complexation capabilities of these new functionalised C,C-pyridylpyrazole isomers 5 and 6 compared to their homologues such as unfunctionalised C,C-pyridylpyrazole 7, 23 C,N-pyridylpyrazole 8 24 and pyrazolylpyrazole 9 11 ligands were investigated using a liquid-liquid extraction process towards bivalent metal ions (Hg 2+ , Cd 2+ , Pb 2+ , Cu 2+ , Zn 2+ ) and alkaline metal ions (Li + , Na + , K + ). The relative capabilities of theses receptors in extracting theses cations were determined by the measurement of extracted cation percentage by atomic absorption.

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“…The result of our investigation was given below (Schemes 1 and 2): The preparation of the new pyrazolic acid precursors 5-8 was carried out in two steps from the pyrazolic ester 1. The preparation in good yield of one isolated major product 2-4 from 3(5)-carboxymethyl-5(3)- methylpyrazole 1 [16] has been already reported [17,18] in the literature. The second step was to hydrolyse the products 1-4 under reflux condition of NaOH followed by neutralisation with HCl to give the pyrazolic acid precursors 5-8 in good yield [19][20][21].…”

Section: Chemistrymentioning

confidence: 87%

Synthesis and Biological Activities of New Triphenyl Organotin (IV) Based on the Pyrazole Carboxylic Acids

Yahyi¹,

Et-Touhami²,

Radi³

et al. 2007

LDDD

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The synthesis of new triphenyltin derivatives with (N-substituted-pyrazol-3-yl) carboxylic acid fragments is described. The in vitro antibacterial activity of the new agents was evaluated against two fungal strains (Saccharomyces cerevisiae and Fusarium oxysporum f.sp albedinis) and against bacterial strains (Echerichia coli). A considerable activity was recorded with respect to the three studied micro-organisms. Structure activity relationship studies (SAR) reflect the effect of substituted pyrazolic fragment.

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ChemInform Abstract: 1,6,11,16‐TETRAAZAPORPHYRINOGEN, SYNTHESIS AND BEHAVIOR

Abstract: Die aus den Chlormethylpyrazolen (I) hergestellten Hydrazine (II) werden mit den β‐Diketonen (III) zu Gemischen der Verbindungen (IV) und (V) umgesetzt.

Cited by 12 publications

References 0 publications

Organically Modified Silica with Pyrazole-3-carbaldehyde as a New Sorbent for Solid-Liquid Extraction of Heavy Metals

Organically Modified Silica with Pyrazole-3-carbaldehyde as a New Sorbent for Solid-Liquid Extraction of Heavy Metals

New Functionalised C,C-pyridylpyrazoles: Synthesis and Cation Binding Properties

Synthesis and Biological Activities of New Triphenyl Organotin (IV) Based on the Pyrazole Carboxylic Acids

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