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Effect of metal corrosion inhibitors, N-acetylmethylpyridium salts, on the hydrogen charging of 08 KP steel and changes in its plasticity upon its etching in solutions of 3 M sulfuric acid. Inhibitors more strongly diminishing the fraction of hydrogen atoms diffusing into the steel and preserving or raising its plasticity as compared with the shipment level were found.

Inhibiting effect of 1-phenacylmethylpyridinium bromides containing urea or thiourea substituents in the pyridinium ring on steel and zinc corrosion in sulfuric acid solutions was studied.

The inhibiting action of N-acetylmethylpyridinium bromides on the corrosion of low-carbon steel in a 3 M sulfuric acid solution at 20, 40, 60, and 80°C was studied. The mechanism of their protective action was examined using electrochemical methods. Compounds exhibiting high anticorrosive properties at elevated temperatures were found.

The inhibiting effect of N-phenacylpyridinium bromides with the amide group in the pyridine ring on corrosion of carbon steel in 3 M sulfuric acid is studied. A relationship between the nature of substituents at the amide group and the corrosion-protective properties of the compounds studied is revealed. Compounds demonstrating high protection efficiency in acid solutions at elevated temperatures are found.

The inhibiting action of N-phenacylmethylpyridinium bromides on corrosion of carbon steel in a 3 M sulfuric acid solution was studied. A relationship between the structure of the compounds under study and their corrosion-protective properties was revealed. Compounds ensuring high degree of corrosion protection of steel in acid media were found.

Inhibiting effect of 1-phenacylmethylpyridinium bromides containing acylthiourea substituents in the pyridine ring on corrosion of mild steel in sulfuric acid (3 M) was studied.

Mixtures of 1-acylmethylpyridinium halides with equimolar amounts of pyridinium halides were prepared by the Ortoleva-King reaction. The inhibiting effect of various pyridinium halides and their mixtures on corrosion of steel in sulfuric acid solutions was studied.

The inhibiting effect of 1-benzoyl-2-R-pyridinium halides on the acid corrosion of steel was studied and compared with that of 1-phenacylmethyl-2-R-pyridinium halides.

By the condensation of α-halogenomethyl derivatives of pyrroles with α-unsubstituted pyrroles the synthesis of the following unsymmetrical dipyrrolylmethanes has been effected: 5-benzyloxycarbonyl-5′-ethoxycarbonyl-3, 3′-di(β-methoxycarbonylethyl)-4,4′-dimethyl-2,2′-dipyrrolylmethane (IIIa), 5-benzyloxycarbonyl-5′-ethoxycarbonyl-3-(β-methoxycarbonylethyl)-4, 4′-diniethyl-3′-n-propyl-2,2′-dipyrrolylmethane(IIIb), 3-acetyl-5-benzyloxycarbonyl-4′-ethyl-5′-methoxycarbonyl-3′, 4-dimethyl-2,2′-dipyrrolylmethane (IIIc), and 3-bromo-5-benzyloxycarbonyl-4′-ethyl-5′-methoxycarbonyl-3′, 4-dimethyl-2,2′-dipyrrolylmethane (IIId). Hydrogenation of the unsymmetrical dipyrrolylmethanes IIIa, b, c, and d has given the corresponding monocarboxylic acids IVa, b, c, and d. The formylation of the dipyrrolylmethanemonocarboxylic acid IVa has given 5′-ethoxycarbonyl-5-formyl-3,3′-di(β-methoxycarbonylethyl)-4, 4′-dimethyl-2,2′-dipyrrolylmethane (V).