In this study, ZnCl2 was applied as an environmentally friendly and efficient Lewis acid catalyst for the one-pot four-component synthesis of polysubstituted dihydro-2-oxopyrroles from the reaction between dialkyl acetylenedicarboxylate, formaldehyde and amines (aromatic and aliphatic) at ambient temperature. This methodology has a number of advantages such as use of inexpensive, eco-safety of catalyst, short reaction times, high yields, easy work-up (just simple filtration), and simplicity of operation.
The mechanism of diepoxide and adipic acid (AA) reaction in the presence of benzyltriethylammonium chloride and 1,4-diazobicyclo[2,2,2] octane has been proposed. The thermal stability of the oligoester obtained via chemical modification of the dioxydiphenylpropane diglycidyl ether with AA and epoxy-oligoesteric mixtures with its participation has been studied. The viscoelastic properties of films based on epoxy-oligoesteric mixtures containing Epidian-5 epoxy resin, TGM-3 oligoesteracrylate, AA modified Epidian-5 and polyethylpolyamine have been determined.
According to the results of studying of kinetic relationships and mechanism of the process of catalytic oxidation of 4-aminotoluene with ozone in the liquid phase, the basis of the technology of 4-aminobenzyl alcohol and 4-aminobenzaldehyde have been developed. It has been shown that under the ozonation conditions in the solution of acetic anhydride in the presence of sulfuric acid, manganese(II) acetate or its mixture with potassium bromide it is possible to stop oxidation at the stage of forming 4-aminobenzyl alcohol or aldehyde.
Regularities of the reaction of oleic acid with a mixture of ethanolamines have been investigated under non-stationary conditions in the presence of H-form of cation-exchange resin KU-2-8 as a catalyst. The effect of a ratio between reagents and the catalyst on the acid conversion, selectivity and products yield has been determined. N-acylation of mono- and diethanolamines by an oleic acid was found to be more intensive compared with esterification of hydroxy groups of ethanolamine.
This work is dedicated to the study of change of composition of surface of catalyst of Мо2В in the reaction of epoxidation of oct-1-ene tert-butyl hydroperoxide under the action of reactionary environment. And as with this process the constrained selectivity of formation of epoxide.
Presented results of x-ray phase analysis of initial and exhaust in a reaction epoxidation of standards of boride of molybdenum - Мо2В. The obtained data testify that both a weekend and exhaust catalyst contains one and that diffraction lances that answer one crystalline phase of Мо2В.
The activation of Mo2B catalyst in the epoxidation of oct-1-ene with tert-butyl
hydroperoxide was researched. Dependences of the initial rate of hydroperoxide consumption
on the initial concentration of octene-1, tert-butyl hydroperoxide and the amount of catalyst in
the reaction mixture in the presence of an unactivated form of the Mo2B catalyst were studied.
The activation process can be described by the Avraami-Erofeev topokinetic equation and
includes two successive steps, viz., the nucleation and formation of a new active phase. The
Вивчено вплив концентрацій октену-1, гомогенного ініціатора (гідропероксиду трет-бутилу) та біметалевого гомогенного каталізатора [(Allyl)ClPd(CN)Ru(Py)4(CN)PdCl(Allyl)] на перебіг початкових стадій реакції рідиннофазного окиснення октену-1 молекулярним киснем. Показано наявність каталітичної та некаталітичної складової у процесі окиснення. Встановлено, що порядок реакції за гідропероксидом і октеном дорівнює oдиниці, тоді як за каталізатором – є менший від одиниці. Розрахована ефективна константа швидкості.
The joint process of isobutylene oxidation and butene-1 oxidative dehydration is studied on the basis of Fe-Te-Mo-Ox catalyst in the impulse flown plant. The optimal process conditions of products yield (methacrolein, butadiene-1,3) are determined. It is shown that the selectivity by butadiene-1,3 increases with the contact time rising at 633 K and the selectivity by methacrolein at 693 K is maximal at contact time of 0.6 s. The maximal total yield of the target reaction products (68.7 %) is obtained at 693 K and contact time of 3.6 s.
The features of acetic acid esterification with С4–С5–alcohols in presence of metal oxalates and other organic and inorganic salts as a catalyst have been studied. It has been found that the presence of conjugated double bonds in oxalic acid reduces the electron density on the cation of catalyst, but due to insolubility of oxalic acid salts in the reaction medium effective influence of anion almost disappears. Досліджені закономірності естерифікації оцтової кислоти спиртами С4–С5 у присутності оксалатів металів та багатьох інших мінеральних і органічних солей.
The influence of the сatalyst type on the process of esterification of 3-methyl-crotonic acid is investigated. The reaction rates and the influence of the nature and structure of a catalyst on k-value of the esterification reaction are determined. Досліджено вплив виду каталізатора на естерифікацію 3-метилкротонової кислоти, визначено константи швидкості та встановлено вплив природи та будови каталізатора на константу рівноваги у реакції естерифікації.