Results 1 to 10 of about 368,867 (264)

A comparative LFER study of the reactivity of pyridineacetic, pyridineacetic acids N-oxide and substituted phenylacetic acids with diazodiphenylmethane in various alcohols [PDF]

open access: yesJournal of the Serbian Chemical Society, 2000
Rate constants have been determined for the reactions of diazodiphenylmethane (DDM) with 3- and 4-pyridineacetic acid, 3- and 4-pyridineacetic acid N-oxide and some meta- and para-substituted phenylacetic acids in twelve alcohols. The determined
Drmanić Saša Z.   +2 more
doaj   +3 more sources

Investigations of the reactivity of pyridine carboxylic acids with diazodiphenylmethane in protic and aprotic solvents: Part II: Pyridine mono-carboxylic acid N-oxides [PDF]

open access: yesJournal of the Serbian Chemical Society, 2006
The rate constants for the reaction of three isomeric pyridine mono-carbocylic acid N-oxides with diazodiphenylmethane were determined at 30 ºC in thirty two protic and aprotic solvents by the well known UV spectrophotometric method.
Drmanić Saša Ž.   +3 more
doaj   +3 more sources

The kinetics of the reaction of 6-substituted nicotinic acids and some p-substituted benzoic acids with diazodiphenylmethane in various alcohols [PDF]

open access: yesJournal of the Serbian Chemical Society, 2000
Rate constants have been determined for the reactions of diazodiphenylmethane with a number of 6-substituted nicotinic acids and p-substituted benzoic acids in twelve alcohols. A comparative study was used to evaluate and compare the Hammett r values and
MILICA M. MISIC-VUKOVIC   +2 more
doaj   +2 more sources

The kinetics of the reactions of 2-substituted nicotinic acids with diazodiphenylmethane in various alcohols [PDF]

open access: yesJournal of the Serbian Chemical Society, 2003
The rate constants of 2-substituted nicotinic acids in reaction with diazodiphenylmethane (DDM) in eight alcohols at 30ºC have been determined. In order to explain the obtained results through solvent effects, the second order reaction rate constants (k)
MILICA M. MISIC-VUKOVIC   +3 more
doaj   +3 more sources

SOLVATOCROMISMO E AS ESCALAS EMPÍRICAS DE POLARIDADE DO SOLVENTE: UMA REVISÃO [PDF]

open access: yesQuímica Nova, 2023
The term solvatochromism is used to describe the changes in the optical properties of a dye molecule by influence of the solvent characteristics. Solvatochromic shifts are governed by intermolecular interactions between solute-solvent that can be either ...
Ingrid Maliszewski Paczkowski   +1 more
doaj   +1 more source

Reichardt’s Dye-Based Solvent Polarity and Abraham Solvent Parameters: Examining Correlations and Predictive Modeling

open access: yesLiquids, 2023
The concept of “solvent polarity” is widely used to explain the effects of using different solvents in various scientific applications. However, a consensus regarding its definition and quantitative measure is still lacking, hindering progress in solvent-
William E. Acree, Andrew S. I. D. Lang
doaj   +1 more source

Investigations of the reactivity of pyridine carboxylic acids with diazodiphenylmethane in protic and aprotic solvents, Part I: Pyridine mono-carboxylic acids [PDF]

open access: yesJournal of the Serbian Chemical Society, 2005
Rate constants for the reaction of diazodiphenylmethane with isomeric pyridine carboxylic acids were determined in chosen protic and aprotic solvents at 30 °C, using the well known UV spectrophotometric method.
Marinković Aleksandar D.   +3 more
doaj   +1 more source

Effect of excess free energy of solvents on the oxidation of methionine by quinolinium fluorochromate: A kinetic study [PDF]

open access: yesJournal of the Serbian Chemical Society, 2008
The oxidation of methionine by quinolinium fluorochromate (QFC) was studied in the presence of chloroacetic acid, in water/organic solvent mixtures of varying excess molar free energy function.
Bhuvaneshwari D.S., Elango K.P.
doaj   +1 more source

Optimization and physical performance evaluation of electrospun nanofibrous mats of PLA, PCL and their blends

open access: yesJournal of Industrial Textiles, 2022
The optimization of process parameters such as applied voltage, orifice diameter, solvent system, and solvent ratio for electrospinning of neat polymers, polylactic acid (PLA) and poly (є-caprolactone) (PCL), to obtain uniform, randomly oriented ...
Deepika Sharma, Bhabani K Satapathy
doaj   +1 more source

Solvatochromism of naringenin in aqueous alcoholic mixtures [PDF]

open access: yesJournal of the Serbian Chemical Society, 2016
The spectral change of naringenin was studied by Uv-vis spectrophotometric method in binary mixtures of water with methanol, ethanol and 1-propanol at 25°C.
Faraji Mohammad, Farajtabar Ali
doaj   +1 more source

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