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Schiff bases

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Preparation of some new schiff bases from 5 nitrovanillin

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PREPARATION OF SOME NEW SCHIFF BASES FROM 5-NITROVANILLIN. A series of Schiff bases were synthesized successfully based on the condensation reaction between 5-nitrovanillin and aromatic amines in moderate and high yields.

Synthesis of new cyclotriphosphazene derivatives bearing Schiff bases and their thermal and absorbance properties

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X = F, Cl, Br) substituted on the Schiff base [45,46]. The char yields of new cyclotriphosphazene derivatives 3a–3d (62.5% for 3a. UV-Vis absorption properties of 3a–3d. The optical properties of new cyclotriphosphazene derivatives (3a–3d) containing Schiff bases and precursor Schiff bases (2a–2d) were evaluated with UV-Vis spectroscopy.

Synthesis, characterization, biological studies, and molecular modeling of mixed ligand bivalent metal complexes of Schiff bases based on N -aminopyrimidine-2-one/2-thione

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Synthesis, characterization, biological studies, and molecular modeling of mixed ligand bivalent metal complexes of Schiff bases based on. All the complexes showed nonelectrolytic behavior. Moreover, the newly synthesized mixed ligand complexes were evaluated for their in vitro antimicrobial efficiency against bacteria and yeast.

Colorimetric cadmium ion detection in aqueous solutions by newly synthesized Schiff bases

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Abstract: Two newly synthesized Schiff bases DMCA and DMBA were used for selective detection of Cd 2+ over a wide range of other metal ions in acetonitrile (ACN)/ Tris-HCl buffer (10 mM, pH 7.32, v/v 2:1). Response of the probes towards metal ions was investigated by using UV-vis spectroscopy.

Synthesis, spectroscopic characterization, and biological screening of binuclear transition metal complexes of bicompartmental Schiff bases containing indole and resorcinol moieties

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In spite of the extensive scientific literature on Schiff base metal complexes with indole moiety, not much is known about bicompartmental Schiff bases derived from indole moiety and their metal complexes. Melting points of the newly synthesized metal complexes were above 300 ◦ C.

Synthesis of novel azo linkage-based Schiff bases including anthranilic acid and hexanoic acid moieties: Investigation of azo-hydrazone and phenol-keto tautomerism, solvatochromism, and ionochromism

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UV-Vis spectroscopy is a very useful method for investigation of tautomerism in azo dyes and Schiff bases.

Comparison of chelating ability of NO-, NS-, ONS-, and ONO-type Schiff base derivatives and their stability constants of Bis-complexes with copper(II)

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Preparation of the Schiff bases. The studied Schiff bases were synthesized by a procedure reported by Perumal et al.

Synthesis, spectroscopic studies, and antioxidant activities of novel thio/carbohydrazones and bis-isatin derivatives from terephthalaldehyde

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Anticonvulsant activity of hydrazones, Schiff and Mannich bases of isatin derivatives. European Journal of Pharmaceutical Sciences 2002. Anticonvulsant activity of Schiff bases of isatin derivatives. European Journal of Pharmaceutical Sciences 1999. Synthesis, antibacterial, antifungal and anti-HIV evaluation of Schiff and Mannich bases of isatin and its derivatives with triazole. Synthesis and antibacterial screening of hydrazones, Schiff and Mannich bases of isatin derivatives.

Synthesis, spectral characterisation, electrochemical, and fluorescence studies of biologically active novel Schiff base complexes derived from E-4-(2-hydroxy-3- methoxybenzlideneamino)-N-(pyrimidin-2-yl)benzenesulfonamide

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All the complexes were found to be active against bacteria and fungi.. 3 It has been reported that biologically active compounds show greater activity when administered as metal complexes than as free compounds. 5 Schiff- base compounds containing an imino group (–RC=N–) are usually formed by the condensation of a primary amine with an active carbonyl group. 6 Schiff bases and their metal complexes are very popular due to their diverse chelating ability. 10 A number of Schiff base molecules show

Synthesis and in vitro cytotoxic activity of novel pyrazolo[1,5-a]pyrimidines and related Schiff bases

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The importance of Schiff bases in the pharmaceutical field prompted us to synthesize some new Schiff bases 11a–f by the condensation of 5-amino- N -aryl-1 H -pyrazole-4-carboxamides 1a–c with 5-methylfuran-2- carbaldehyde 10a or ferrocene-2-carboxaldehyde 10b in boiling ethanol using a catalytic amount of triethy- lamine (Scheme 3).

Bis benzothiophene Schiff bases: Synthesis and in silico-guided biological activity studies

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Proton signal of imine group (N= CH) obtained by Schiff base reaction was observed as singlet at 8.57–8.64 ppm in the 1 H-NMR spectra of the compounds (1-9). Aromatic protons belonging to benzo[ b ]thiophen ring resonated at 7.37–7.97 ppm and CH 2 alkyl protons were seen at 1.28–3.68 ppm in the 1 H-NMR spectra of the compounds as expected from alkyl groups.

The synthesis of 1,3-dialkyl-4-methylimidazolinium salts and their application in palladium catalyzed Heck coupling reactions

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General procedure for the preparation of Schiff bases. A solution of the aldehydes (10 mmol) and 1,2-diaminopropane (5 mmol) in ethanol (30 mL) was heated under reflux for 3 h. General procedure for the preparation of diamines. General procedure for the preparation of imidazolinium salts (3a–g).

Microwave irradiated synthesis of Schiff bases of 4-(arylideneamino)-5-alkyl-2,4- dihydro-1,2,4-triazole-3-thione containing 1,2,4-triazole segment

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In the 1 H NMR of Schiff base 5a in d 6 -DMSO, signal for the CH proton of imine bond was observed at 10.35 ppm, beside the 13 C NMR spectrum signal at 154.1 or 157.0 ppm due to -CH=N- carbon atom.

An anthracene based fluorescent probe for the selective and sensitive detection of Chromium (III) ions in an aqueous medium and its practical application

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The LOD value of ANT-Th was lower than the other Schiff bases based fluorescent probe, as indicated in Table S . Similarly, the response time of ANT-Th was quite rapid than other works . (a) Fluorescence titration spectra of ANT-Th (10 µM) in 6:4 CH 3 CN/HEPES at pH = 7.0 in the presence of Cr 3. (b) Fluorescence intensity changes depending on the number of equivalents of Cr 3+ (mole equivalents = 0–10 equiv.)..

A Challenging Classic Coupling: Esterification of Camphoric Acid - a Steric-Hindered Polar Carboxylic Acid and Solanesol - a Long-Chain Nonpolar Alcohol

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The in situ anhydride formation offers a direct synthetic route to the hybrid compound solanesyl camphorate.. (2001), “Synthesis of new chiral Schiff bases and their application in the asymmetric trimethylsilylcyanation of aromatic aldehydes”, Tetrahedron: Asymmetry 12, pp.. [7] Up to now, there has been no report on a synthesis of monosolanesyl camphorate yet..

Synthesis, characterization and evaluation of antidengue activity of enantiomeric Schiff bases derived from S-substituted dithiocarbazate

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doi:10.3906/kim-2006-22. δ = 198.24 (C=S), 170.82 (C=N), 52.89 (CN–C–CH 3. 47.57 (CH 3 –C–CH 3. 43.35 (CH 2 –CH–CH 2. 35.10 (CN–CH 2 –CH), 32.21 (CN–C–CH 2. 26.63 (CH 2 –CH–CH 2. 19.18 (CH 3 –S), 18.43 (CH 3 –C–CH 3. 16.79 (CH 3 –C–CH 3. δ = 198.27 (C=S), 170.86 (C=N), 52.92 (CN–C–CH 3. 47.61 (CH 3 –C–CH 3....

Synthesis, biological evaluation of antioxidant-antibacterial activities and computational studies of novel anthracene- and pyrene-based Schiff base derivatives

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Schiff bases display strong chelating ability due to the presence of unpaired electrons on nitrogen atom of the azomethine moiety, especially when one or more donor atoms located in close neighbourhood to the azomethine group.

Synthesis, characterization, and DFT calculation of a Pd(II) Schiff base complex

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The Schiff base ligand, H 2 L, was prepared according to the procedure described in the literature.

Thermolytic synthesis of cobalt and cobalt sulfide nanoparticles using Cobalt(II) N∧O Schiff base complexes as single molecular precursors

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IR spectra of Schiff base (a) ligand 2 and (b) complex 4.

Tổng hợp, nghiên cứu cấu trúc và thăm dò hoạt tính sinh học của phức ni (II) với Bazơ schiff isatin

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Khi tác dụng với amin sẽ tạo thành bazơ Schiff isatin, có hoạt tính sinh học quý, đặc biệt có khả năng chống lại HIV [5], [6]. Gần đây, một số công trình đã chứng minh rằng phức kim loại chuyển tiếp của bazơ Schiff isatin không những có hoạt tính sinh học phong phú mà còn được tăng lên đáng kể so với isatin và bazơ Schiff isatin tự do . Tuy nhiên những công bố về phức chất của bazơ Schiff đi từ isatin và diaminopropan vẫn chưa nhiều [7].