Evaluation of the influence of base and alkyl bromide on synthesis of pyrazinoic acid esters through fatorial design [PDF]
Química Nova, 2009 Pyrazinoic acid esters have been synthesized as prodrugs of pyrazinoic acid. In the literature, its preparation is reported through the reaction of pyrazinoyl chloride with alcohols and the reaction with DCC/DMAP.
João Paulo dos Santos Fernandes +1 more
doaj +4 more sources
Methyl esters selectivity of transesterification reaction with homogenous alkaline catalyst to produce biodiesel in batch, plug flow, and continuous stirred tank reactors [PDF]
, 2014 Selectivity concept is essential in establishing the best operating conditions for attaining maximum production of the desired product. For complex reaction such as biodiesel fuel synthesis, kinetic studies of transesterification reaction have revealed ...
Kamarudin, S. K. +3 more
core +4 more sources
Synthesis of pure monetite by heterogeneous acid-base reaction
Revista Colombiana de Química, 2017 Five variations of the monetite (M) synthesis were evaluated modifying the stirring, the phosphoric acid addition rate, the homogeneity and the drying temperature. Products were assessed by means of XRD, FTIR, SEM-EDS analysis and chemical assay of Ca/P (
Luis Carlos Moreno Aldana +2 more
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Histological analysis of biocompatibility of ionomer cements with an acid-base reaction
Brazilian Oral Research, 2014 The purpose of this study was to evaluate the inflammatory and cure events of acid-based reactions using glass ionomer cement used for cementation of crowns, bridges, onlays and orthodontic bands implanted in subcutaneous tissue, at different time ...
Rogério Lacerda dos Santos +5 more
doaj +1 more source
Two-parameter determination in vinegar by a flow injection-pervaporation system [PDF]
, 2001 A flow-injection method (FI) for the sequential determination of ethanol and acetic acid in vinegar is reported. The determination of ethanol is based on the oxidation of the pervaporated ethanol by Cr2O7K2.
Gonzalez-Rodriguez, Jose +2 more
core +1 more source
Facile synthesis of cooperative acid-base catalysts by clicking cysteine and cysteamine on an ethylene-bridged periodic mesoporous organosilica [PDF]
, 2016 A periodic mesoporous organosilica (PMO) that contains ethylene bridges was functionalized to obtain a series of cooperative acid-base catalysts. A straightforward, single-step procedure was devised to immobilize cysteine and cysteamine on the support ...
Esquivel Merino, Maria Dolores +6 more
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Propriedades relacionadas à acidez e basicidade a partir da abordagem em química computacional
Química Nova, 2014 Analytical Chemistry books lack a clear link between thermodynamic and equilibrium approaches involving acids and bases. In this work, theoretical calculations were performed to search for these relations.
Sérgio R. B. Silva +2 more
doaj +1 more source
A two-step approach to achieve secondary amide transamidation enabled by nickel catalysis. [PDF]
, 2016 A long-standing challenge in synthetic chemistry is the development of the transamidation reaction. This process, which involves the conversion of one amide to another, is typically plagued by unfavourable kinetic and thermodynamic factors. Although some
Anthony, Sarah M +4 more
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Reactivity difference between protolytic forms of some macrocyclic chromium(III) complexes in ligand substitution and electron transfer processes [PDF]
, 2010 The review provides insight into the mechanism of ligand substitution and electron transfer (from chromium( III) to iron(III)) by comparison of the reactivity of some tetraazamacrocyclic chromium(III) complexes in the conjugate acid-base forms.
Chatlas, J. +9 more
core +1 more source
Molecules, 2023 We herein report the acid/base-steered two distinct reaction pathways of 2-acylbenzoic acids with isatoic anhydrides. In the presence of Na2CO3, the cascade process consists of the cyclization of 2-acetylbenzoic acid and nucleophilic ring-opening ...
Ran Shi +6 more
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