V. A. Ponomarenko

Cycloaddition of perfluorovinyl ethers to dienes

ConclusionsCycloaddition of perfluorovinyl ethers to butadiene or piperylene led to 1-vinyl- or 1-propenyl-2-perfluoroalkoxy-2,3,3-trifluorocyclobutanes as mixtures of cis and trans isomers.

Cotrimerization of mono- and dinitriles of perfluorocarboxylic acids under high pressures

Cotrimerization of mono- and dinitriles of perfluorocarboxylic acids under high pressures affords oligoperfluoroalkylenetriazines. These oligomers are highly efficient stabilizers of thermooxidative destruction of perfluoropolyethers, when they are contacting with metals at elevated temperatures.

Characteristic features of cyclotrimerization of perfluoroalkyl- and perfluorooxaalkylacetylenes

Cyclotrimerization of perfluoroalkyl- and perfluorooxaalkylacetylenes has been studied under various conditions. A scheme of the reaction mechanim has been suggested.

Synthesis of fluoro-containing substituted 1,3,5-triazines

ConclusionsBy the method of acylation-cyclodehydration of imidoylamidines we have prepared 1,3,5-triazines with three different substituents, among them reactive unsaturated and nitrile groups.

Reaction of methylmagnesium iodide with perfluorocarboxylate esters

ConclusionsIn the reaction of methylmagnesium iodide with esters of perfluorocarboxylic acids, the magnesium salt of the hemiketal was found to be more stable and the ketone yield was found to be higher with increasing bulk of the alkoxy group of the ester.

Trimerization of perfluoroheptanonitrile at high pressures

ConclusionsA study was carried out on the trimerization of perfluoroheptanonitrile under high pressure conditions at 110 and 124°C. This reaction obeys zero-order kinetics relative to the monomer and first-order kinetics relative to the catalyst.

Reaction of perfluoroalkyltriazines with amidines of perfluoroalkylcarboxylic acids

ConclusionsThe amidines of perfluorocarboxylic acids and perfluorotriazines enter into exchange reaction at 20–60° to give an equilibrium mixture with new triazines and amidines.

Synthesis of perfluoroxaalkylenedivinyl ethers

ConclusionsSome features are given of the formation and structure of perfluoroxaalkylenedivinyl ethers obtained by the pyrolysis of salts of perfluoroxaalkylenedicarboxylic acids. The nature of the side products was established by spectral methods.

The acylation-dehydration of N′-(perfluoroacylimidoyl)perfluoroalkylamidines by carboxylic and polyfluoro- and perfluorocarboxylic acid anhydrides

Conclusions1.The reactivities of a series of anhydrides of alkane, fluoroalkane, and perfluoroalkane carboxylic acids were determined using the method of competing acylation-cyclodehydration and the cyclization process was shown to be subject to polar and steric effects of the groups at the reaction centers of the anhydrides.2.Carboxylic acid anhydrides react with perfluorocarboxylic acids with the formation of the mixed anhydride and the corresponding carboxylic acid.

Reactions of perfluorooxaalkyl ketones with nucleophiles

1. Branched perfluorooxaalkyl groups have less steric influence on the reaction of their ketones with nucleophiles than does the perfluoroisopropyl group. 2. The course of the haloform reaction of branched perfluorooxaalkyl ketones is determined by the size and branching of the perfluorooxaalkyl group attached to the keto group. 3. The erythro and threo isomers of these ketones are cleaved at different rates in this reaction.