Chemical and spectroscopic studies in metal β-diketonates. I. Preparation and study of halogenate metal acetylacetonates

1967 ◽  
Vol 20 (4) ◽  
pp. 639 ◽  
Author(s):  
PR Singh ◽  
R Sahai
Keyword(s):  
Acetic Acid ◽  
Spectroscopic Data ◽  
Electrophilic Substitution ◽  
Spectroscopic Studies ◽  
Electrophilic Substitution Reaction ◽  
Iodine Monochloride ◽  
Metal Acetylacetonates ◽  
Reaction Conditions ◽  
The Third ◽  
Aromatic Systems

Introduction of chlorine, bromine, and iodine into the rings of acetylacetonates of CuII, NiII, AlIII, CrIII, FeIII, CoIII, and VOIV has been effected by direct halogenation under varied but carefully controlled electrophilic substitution reaction conditions (usually applicable to aromatic systems) such as with chlorine, N-chlorosuccinimide (NCS), bromine, N-bromosuccinimide (NBS), or iodine monochloride in chloroform, acetic acid, or methanol solvent. Infrared and ultraviolet spectroscopic data on the metal chelates and their halogen derivatives have been obtained with a view to studying possible changes brought about by such substitution in the acetylacetonate rings of different metals. The v(C=C) and v(C=O) values were both found to show a linear relationship with the mass numbers of the substituents as also with the third ionization potential of trivalent metals. The halogenation of these chelates apparently results in an extension of conjugation.

The Synthesis of Zinquin Ester and Zinquin Acid, Zinc(II)-Specific Fluorescing Agents for Use in the Study of Biological Zinc(II)

1996 ◽  
Vol 49 (5) ◽  
pp. 561 ◽  
Author(s):  
IB Mahadevan ◽  
MC Kimber ◽  
SF Lincoln ◽  
ERT Tiekink ◽  
AD Ward ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Crystal Structures ◽  
Electrophilic Substitution ◽  
Ethyl Acrylate ◽  
Heck Coupling ◽  
Ethyl Bromoacetate ◽  
Reaction Conditions ◽  
Bromo Derivative ◽  
Boron Tribromide

The syntheses of Zinquin ester [ethyl [2-methyl-8-(p- tolylsulfonylamino )-6-quinolyloxy]acetate] and the corresponding acid, both of which are zinc(II)-specific fluorophores , are described. 6-Methoxy-2-methyl-8-(p- tolylsulfonylamino ) quinoline (2) can be demethylated , with boron tribromide, to form either the expected phenol or a mixture of the phenol and the corresponding 5-bromo derivative depending upon the reaction conditions. These compounds react with ethyl bromoacetate to give the corresponding esters, as well as the 5-ethoxycarbonyl derivative formed by electrophilic substitution. Halogenation of the sulfonamide (2) occurs readily at the 5-position. The 5-iodo product undergoes a Heck coupling with ethyl acrylate . The crystal structures of ethyl [5-ethoxycarbonylmethyl-2-methyl-8-(p- tolylsulfonylamino )-6-quinolyloxy]acetate and [5-carboxymethyl-2-methyl-8-(p- tolylsulfonylamino )-6-quinolyloxy]acetic acid are described.

SPECTROSCOPICALLY AND/OR STRUCTURALLY INTRIGUING PHTHALOCYANINES AND RELATED COMPOUNDS. PART 1. MONOMERIC SYSTEMS

2019 ◽  
Author(s):  
Nagao Kobayashi
Keyword(s):  
Spectral Data ◽  
Electronic Absorption ◽  
Spectroscopic Data ◽  
Magnetic Circular Dichroism ◽  
Spectroscopic Techniques ◽  
Mo Calculations ◽  
Time Resolved ◽  
The Third ◽  
Aromatic Systems ◽  
Related Compounds

The first part of the series of review papers on the properties of some synthetically and spectroscopically interesting studies of our group for the period 2007-2017 is presented. In particular, examples are shown on the analysis of spectroscopic data in conjunction with molecular orbital (MO) calculations. We have used mainly electronic absorption and natural and magnetic circular dichroism (CD and MCD) spectroscopic techniques, with occasional use of fluorescence, phosphorescence, and time-resolved EPR. Not only the spectra of (4n + 2)π systems, but also some 4nπ anti-aromatic systems are theoretically analyzed, which helps the reader to learn how to interprete the spectral data. In the first part and the second part of this review monomer systems are considered, and in the third - trimeric and tetrameric systems. <span style="opacity: 0;"> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . </span>

scholarly journals NMR Spectral Correlations in Some Tröger’s Bases

2013 ◽  
Vol 23 ◽  
pp. 1-11
Author(s):  
Ganesamoorthy Thirunarayanan ◽  
M. Suresh
Keyword(s):  
Spectroscopic Data ◽  
Electrophilic Substitution ◽  
Chemical Shifts ◽  
Acid Catalyst ◽  
Electrophilic Substitution Reaction ◽  
Regression Analyses ◽  
Substituted Anilines ◽  
Anhydrous Alcl3 ◽  
Lewis Acid Catalyst ◽  
Substituent Constants

Some Tröger’s bases have been synthesised from substituted anilines and paraformaldehyde in presence of Lewis acid catalyst such as anhydrous AlCl3, through electrophilic substitution reaction. The purities of these Tröger’s bases have been checked by their physical constants and spectroscopic data published earlier in the literature. The NMR chemical shift (δ, ppm) of methylene protons and carbon were assigned. The assigned methylene protons and carbon chemical shifts (δ, ppm) of synthesised Tröger’s bases have been correlated with Hammett substituent constants, F and R parameters using single and multi-regression analyses. From the results of statistical analyses, the effects of substituent on methylene protons and carbon were discussed.

scholarly journals Electrosynthesis and Spectroscopic Characterization of Poly(o-Aminophenol) Film Electrodes

2012 ◽  
Vol 2012 ◽  
pp. 1-26 ◽  
Author(s):  
Ricardo Tucceri ◽  
Pablo Arnal ◽  
Alberto Scian
Keyword(s):  
Electrochemical Synthesis ◽  
Spectroscopic Data ◽  
Chemical Structure ◽  
Electrode Materials ◽  
Spectroscopic Characterization ◽  
Spectroscopic Studies ◽  
Formation Mechanisms ◽  
The Third ◽  
Basic Solutions

This review, which is divided into three parts, concerns electrochemical synthesis, spectroscopic characterization, and formation mechanisms of poly(o-aminophenol) (POAP) film electrodes. The first part of this review is devoted to describe the electropolymerization process of o-aminophenol on different electrode materials and in different electrolyte media by employing both potentiodynamic and potentiostatic methods. The second part refers to spectroscopic studies carried out by different authors to both, identify the products of the o-aminophenol electrooxidation and elucidate the chemical structure of poly(o-aminophenol) film electrodes. The third part shows the different mechanisms formulated to interpret the POAP films formation from both acid and basic solutions of o-AP. Also, some electrochemical and spectroscopic data which allowed to propos the corresponding formation mechanisms, especially in basic media, are described.

Ruthenium-catalyzed efficient routes to oxindole derivatives

2009 ◽  
Vol 87 (9) ◽  
pp. 1213-1217 ◽  
Author(s):  
Khalil Tabatabaeian ◽  
Manouchehr Mamaghani ◽  
Nosratollah Mahmoodi ◽  
Alireza Khorshidi
Keyword(s):  
Substitution Reaction ◽  
Electrophilic Substitution ◽  
Electrophilic Substitution Reaction ◽  
Reaction Conditions ◽  
One Pot

Ruthenium-catalyzed preparation of oxindoles from one-pot trimerization of indoles under oxidative conditions and from electrophilic substitution reaction of indoles with isatins or isatin-derived imines under very mild reaction conditions is reported.

The Third and Fourth Excited Torsional States of Acetic Acid

2020 ◽  
Author(s):  
Vadim Ilyushin ◽  
Yan Bakhmat ◽  
Eugene Alekseev ◽  
Olha Dorovskaya
Keyword(s):  
Acetic Acid ◽  
The Third

Study on the Synthesis of Isoamyl Acetate Catalyzed by Strong Acidic Cation Exchange Resin

2011 ◽  
Vol 396-398 ◽  
pp. 2411-2415 ◽  
Author(s):  
Ping Lan ◽  
Li Hong Lan ◽  
Tao Xie ◽  
An Ping Liao
Keyword(s):  
Acetic Acid ◽  
Reaction Time ◽  
Cation Exchanger ◽  
Cation Exchange Resin ◽  
Isoamyl Acetate ◽  
Molar Ratio ◽  
Esterification Reaction ◽  
Reaction Conditions ◽  
Optimum Reaction

Isoamyl acetate was synthesized from isoamylol and glacial acetic acid with strong acidic cation exchanger as catalyst. The effects of reaction conditions such as acid-alcohol ratio, reaction time, catalyst dosage to esterification reaction have been investigated and the optimum reaction conditions can be concluded as: the molar ratio of acetic acid to isoamylol 0.8:1, reaction time 2h, 25 % of catalyst (quality of acetic acid as benchmark). The conversion rate can reach up to 75.46%. The catalytic ability didn’t reduce significantly after reusing 10 times and the results showed that the catalyst exhibited preferably catalytic activity and reusability.

scholarly journals Facile synthesis of bis(indolyl)methanes using iron(III) phosphate

2012 ◽  
Vol 77 (9) ◽  
pp. 1157-1163 ◽  
Author(s):  
Kargar Behbahani ◽  
Masoumeh Sasani
Keyword(s):  
Substitution Reaction ◽  
Electrophilic Substitution ◽  
Catalytic Amount ◽  
Reusable Catalyst ◽  
Electrophilic Substitution Reaction ◽  
Facile Synthesis

A new, convenient and high yielding procedure for the preparation of bis(indolyl)methanes in glycerol by electrophilic substitution reaction of indole with aldehydes in the presence of catalytic amount of FePO4 (5.0 mol%) as a highly stable and reusable catalyst is described.

Metal Phenoxyalkanoic Acid Interactions. XXV. The Crystal Structures of (2-Formyl-6-Methoxyphenoxy)Acetic Acid and Its Zinc(II) Complex and the Lithium, Zinc(II) and Cadmium(II) Complexes of (2-Chlorophenoxy)Acetic Acid

1987 ◽  
Vol 40 (7) ◽  
pp. 1147 ◽  
Author(s):  
EJ Oreilly ◽  
G Smith ◽  
CHL Kennard ◽  
TCW Mak
Keyword(s):  
Acetic Acid ◽  
Crystal Structures ◽  
Free Acid ◽  
Rotational Symmetry ◽  
Carboxyl Groups ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Third ◽  
Planar Complex ◽  
Hydrogen Bonded

The crystal structures of (2-formyl-6-methoxyphenoxy)acetic acid (1), diaquabis [(2-formyl-6-methoxyphenoxy) acetato ]zinc(11) (2), tetraaquabis [(2-chlorophenoxy) acetato ]zinc(11) (3), triaquabis [(2-chlorophenoxy) acetato ]cadmium(11) dihydrate (4) and lithium (2-chloro- phenoxy )acetate 1.5 hydrate (5) have been determined by X-ray diffraction. The acid (1) forms centrosymmetric hydrogen-bonded cyclic dimers [O…0, 2.677(6) �] which are non-planar. Complex (2) is six-coordinate with two waters [Zn- Ow , 1.997(2) �] and four oxygens from two asymmetric bidentate carboxyl groups [Zn-O, 2.073, 2.381(2) �] completing a skew trapezoidal bipyramidal stereochemistry. Complex (5) is also six-coordinate but is octahedral, with two trans-related unidentate carboxyl oxygens [mean Zn-O, 2.134(9) �] and four waters [mean Zn-O, 2.081(9) �]. The seven-coordinate complex (4) has crystallographic twofold rotational symmetry relating two :symmetric bidentate acid ligands [ Cd -O, 2.26, 2 48(:) �] and two waters [ Cd -O, 2.34(2) �] while the third water lies on this axis [ Cd -O, 2.27(2) �]. In contrast to the monomers (2)-(4), complex (5) is polymeric with tetrahedral lithium coordinated to one water and three carboxylate oxygens [mean Li-0, 1.95(1) �]. The essential conformation of the free acid is retained in complexes (2), (3) and (4) but in (5), it is considerably changed.

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