Direct oximation of 2-oxo-2-phenylacetate (3) gave the (Z)-methyl 2-(methoxyimino)-2-phenylacetate (1) in 71% yield, while the E oxime 2 was prepared from 3 in 65% yield via oxime isomerization of 2-(methoxyimino)-2-phenylacetic acid (5). Computational studies suggest that the isomerization of 5...

Herein, we have developed a simple, environment friendly fluorescent turn-off and colorimetric sensor for the rapid detection of Cu2+ ions in aqueous solution by using organic Schiff base ligand benzildihydrazone-N,N'-bis(2-hydroxy-4-diethylamino-1-formylbenzene) (L). Binding interaction be...

Mineral homeostasis in hypertensive patients may be affected by hypotensive drugs. The aim of this study was to assess the influence of selected antihypertensive drugs on mineral homeostasis in a rat model of hypertension. Eight-week-old male spontaneously hypertensive rats (SHRs) were treated w...

Chronopotentiometry and linear potential sweep (LPS) voltammetry were applied to study cathodic processes occurring at the Cu electrode in Cu(II) solutions containing gluconate (L−) and excess of sulfate at 2

The chromatographic behaviour of 29 aromatic amino acids (18 sulphonic, 9 carboxylic and 2 arsonic) on both cellulose and polystyrene-based anion and cation exchangers was studied. The influence of the protonation of the amino group on the selectivity of the polystyrene-based anion and cation ex...

The rate of sulphonation of a series of polymethylbenzene sulphonic acids in 99·6 % H2SO4 has been determined at 25·0°. The observed rate order for the various substrates (2,3,4-Me3 > 2,4-Me2 > 2,3-Me2 > 2,4,5-Me3 = 2,4,6-Me3 > 2-Me > 4-Me) is explained in terms of steric and electronic effec...

Publisher SummaryAromatic sulfonic acids derived from benzene, naphthalene, anthracene and anthraquinone, and their amino-and hydroxysubstituted derivatives are important intermediates in the production of synthetic dyes. Alkyl- and alkylarylsulfonic acids are widely used as anionic surface-acti...

The coulometric generation of hydrogen ions by the anodic oxidation of esters of gallic acid (methyl, ethyl, propyl and octyl gallate), hydroquinone, ascorbic acid, 2,3,4-trihydroxybenzoic acid, tiron and hydrogen dissolved in palladium in γ-butyrolactone is described. The current–potential cu...

The specificity of the vesicular l-glutamate carrier was characterized using dyes with biphenyl and amino- and sulphonic acid substituted naphthyl groups, structurally similar to the specific vesicular l-glutamate inhibitor Evans Blue. The dye Trypan Blue was the most potent inhibitor; the ic50 ...

:Definition and classification of acid dyes are discussed. Chemistry of azo, anthraquinone, nitrodiphenylamine, triphenylmethane and xanthenes dyes are discussed.

Aliphatic ketones were reduced to the corresponding secondary alcohols by using anti-1,3-diol and a catalytic amount of 2,4-dinitrobenzenesulfonic acid (DNBSA) in benzene at reflux. Addition of 1-octanethiol in that media improved the efficiency of the reduction. Asymmetric reduction of aliphati...

A highly regio- and stereoselective Brønsted acid-catalyzed coupling of ynamides and indoles is described. This process is the equivalent of hydroarylation of ynamides and leads to the efficient syntheses of vinylindoles. Diels–Alder reaction between the vinylindoles and DMAD afforded carbazole...

It is aimed to provide a cost effective p-NBSA catalyzed nucleophilic substitution of propargyl alcohols with alcohols, amines and heterocycles, without employing corrosive and costly metal catalysts, toxic solvents and column chromatography for purification. A systematic study of CC, CN and CO ...

Ten tris(2-hydroxyethyl)ammonium (triethanolammonium)-based protic ionic liquids (ILs) and one molten salt were synthesized by proton transfer reaction from sulfonic acid to triethanolamine (TEOA). The produced PILs were dried under high vacuum at 50 °C for 8 h before use. The PILs were charact...

Six triethylammonium-based protic ionic liquids (PILs) and two molten salts were synthesized via a proton transfer reaction from sulfonic acid to triethylamine (TEA). The PILs were characterized by 1H NMR, 13C NMR, 1H/15N NMR and FT-IR spectroscopic methods. The phase behavior of the PILs was st...

Alkyl phenyl selenoxides were produced in excellent yields by oxidation of the corresponding selenides with 2-nitrobenzenesulfonyl chloride and potassium superoxide in dry acetonitrile at −15 °C.

A new, operationally simple one-pot method has been developed for the regioselective synthesis of a series of novel 4-olefinated dihydropyridines bearing various functional groups from the reaction of pyridine, acylacetamides, and sulfuryl chlorides under mild conditions. In this multicomponent ...

A reinvestigation of the thioacetylation method of protein sequencing (G. A. Mross and R. F. Doolittle (1971) Fed. Proc. 30, 1241. G. A. Mross and R. F. Doolittle (1977)in Advanced Methods in Protein Sequence Determination (Needleman, S. B., Ed.), pp. 1–20, Springer, Berlin) has revealed that 2...

A simple protocol that allows the preparation of separable epimeric sulfinamides from chiral amines and sulfonyl chlorides reduced in situ with triphenylphosphine in the presence of KOH is described. Using this method, tosyl chloride and nosyl chloride were successfully reacted with α-substitut...

A mild method for the aminolysis of carboxylic acid chlorides to give amides is disclosed. Reactions are carried out in the presence of silver acetate in non-aqueous environments under heterogeneous phase conditions. Amides are easily recovered in very good to excellent yields and without racemi...