Zh. V. Shmyreva

6-(1,3-Dioxoindan-2-ylidenemethyl)-1,2,2,4-tetramethyl-1,2-dihydro- and 1,2,3,4-Tetrahydroquinolines

Abstract6-Formyl-1,2,2,4-tetraalkyldi- and -tetrahydroquinolines have been synthesized by the Vilsmeier reaction and they are readily condensed with 1,3-indanedione to give 2-hetarylidene-1,3-indanediones. The latter exist as complexes with charge transfer from the quinoid structure of the heterocyclic fragment.

Effect of Transition Metal Diketonates on Oxidation of Sunflower-Seed Oil

Effect of transition metal (Mn, Fe, Co, Ni, Cu, Zn) diketonates on oxidation of sunflower-seed oil with atmospheric oxygen was studied.

2,2,4-Trimethyl-1,2-dihydroquinoline hydrochloride as coagulant for butadiene-styrene latices

Coagulating action of 2,2,4-trimethyl-1,2-dihydroquinoline hydrochloride in separating butadienestyrene rubber from latex is studied, and the properties of vulcanizate based on rubbers prepared by this procedure are examined.

Effect of sulfur-containing phenols and amines on the decomposition of hydroperoxides

The effect of polyphenol sulfides (PPS) and dithiolthione, the sulfur-containing derivative of acetone anil, on the decomposition of cumyl andn-decyl hydroperoxides (DHP) studied. The decomposition of cumyl hydroperoxide (CHP) in the presence of PPS is a complex multistep autocatalytic process during which an efficient catalyst for CHP decomposition is formed from the initial PPS. The PPS catalyst for CHP decomposition is deactivated in the reaction with peroxy radicals. Kinetic characteristics of the reaction between polyphenol sulfides and CHP are determined. Dithiolthione catalytically decomposes CHP and reacts with n-decyl hydroperoxide DHP in the stoichiometric ratio

Kinetic description of the oxidation of hydrocarbons inhibited by sulfur-containing hydrogenated quinolines

The inhibiting effect of dithiolthione derivatives of hydrogenated quinolines (DTT) on the oxidation of various hydrocarbons (n-decane,n-decene, ethylbenzene, β-carotene) was investigated. The inhibiting effect of the DTTs is greater at high temperatures (>100 °C) than that of the parent hydrogenated quinolines and weaker at moderate temperatures. The DTTs do not affect the decomposition of hydroperoxides. Probably, the introduction of a dithiolthione cycle to a hydroquinoline molecule decreases its reactivity toward O2 and peroxide radicals, which favors the enhancement of the antioxidative activity of the DTTs at elevated temperatures.

Reactions of N,N′-diphenyl-p-quinonediimine with hydroquinone, α-tocopherol, and other antioxidants

Phenols (hydroquinone and α-tocopherol) and heterocyclic aminophenols (2,2,4-trimethyl-6-ethoxy-1,2-dihyroquinoline) reduce N,N′-diphenyl-p-quinonediimine (A) to the diamine. With difunctional hydrogen atom donors, the reaction rate is proportional to the concentrations of the reactants. The effective rate constants have been determined over a range of temperatures. In the reaction of A with α-tocopherol, plots of rate versus initial concentrations are nonlinear, 2,6-Di-tert-butyl-4-methylphenol and 2,2,4-trimethyl-6-ethoxy-1,2-dihyroquinoline do not react with A under the same conditions.

Inhibiting action of sulfur-containing hydroquinolines during polymerization of vinyl monomers

Abstract4,5-Dihydro-4,4-dimethyl-2,3-dithiolo[5,4-c]quinoline-1-thiones and gossypol are effective antioxidants in the polymerization of vinyl monomers. Kinetic parameters of inhibition reactions depend on the structure of the monomer and inhibitor and the nature of the initiator. A mechanism is proposed for the reaction of peroxy radicals with sulfur-containing hydroquinolines.

Reaction of nitroxyl radicals with dichlorocarbene

ConclusionsThe reaction of aromatic nitroxyl radicals with dichlorocarbene, generated under phase transfer catalysis conditions, leads to the corresponding hydrazine derivatives through the abstraction of the oxygen atom from the nitroxyl radicals and formation of aminyl radicals.

Sulfuration of 2,2,4-trimethyl-1,2,3,4-tetrahydroquinolines

ConclusionsSubstituted 2,2,4-trimethyl-1,2,3,4-tetrahydroquinolines upon reaction with a six-fold amount of sulfur at 210–220°C, similarly to dihydroquinolines, give the corresponding 4,5-dihydro-4,4-dimethyl-2,3-dithiolo[3,4-c]quinoline-1-thiones.

New stable nitroxyl radicals from hydrogenated quinolines

ConclusionsSyntheses were reported for 6-triphenylmethyl derivatives of 2,2,4-trimethyl-1,2-dihydroquinolines and 2,2,4-trimethyl-1,2,3,4-tetrahydroquinolines as well as 4-phenpl-1,2,3,4-tetrahydroquinoline. The oxidation of these compounds by H2O2 in the presence of Na2WO4 and also by m-chloroperbenzoic acid gave nitroxyl radicals, whose structures were supported by EPR spectroscopy.