butyl-4-N-pyridinium bromide and 1(2-propenylphenoxy)butyl-4-N-pyridinium bromide were synthesized and investigated as corrosion inhibitors steel st. 3. Their corrosion inhibition property was investigated in aqueous-salt containing solution hydro-carbonic and H 2 S. For this purpose, a serious of techniques such as gravimetric method measurement, scanning electron microscope (SEM-XL-30) were used. Some thermodynamic parameters of corrosion process (∆G ads. , ∆H 0 ads. , ∆S 0 ads. ) were determined. Results showed that synthesized compounds at the concentrations 50-150 mg l -1 have anticorrosion activity 62-96%.

By triple condensation of 2-allylphenol with formaldehyde and methylamine (at a ratio of 1:1:1 and 1:2:1 mol, at 800C for 3 hours) a number of compounds (I-III) of various structures was prepared. It has been established that, depending on the ratio of the taken reagents, compounds of various structures are formed. By the reaction of compound I - 8-allyl-substituted 1,3-benzoxazine with HBr quaternary ammonium salt (IV) was obtained. Antimicrobial activity of 8-allyl-substituted 1,3-benzoxazine (I) and ammonium salt (IV) against microorganisms: Staphylococcus aureus NCTC 6571, Staphylococcus aureus ATCC®25923, Escherichia coli ATCC®25922, Candida albicans NSTC-3255/ATCC2091, Shigella flexneri ATCC®12022, Salmonella enterica ATCC®13076, and Aspergillus niger (aquatic isolate) was studied. It was found that compounds I and IV at a concentration of 30 mg/L in comparison with the references (amoxicillin and fluconazole) have the highest bactericidal and fungicidal properties. By thermal treatment of compound I cross-linked copolymer V was synthesized. While studying the thermal properties of copolymer V their sufficient thermal stability (up to ~4500C) was established. Copolymer V also has a sorption property for the extraction of uranyl ions from aqueous systems (the degree of extraction at pH 7 is ~70%, the sorption capacity – 178 mg/g). The structures of the obtained compounds were confirmed by IR and NMR spectroscopy

. The article presents the results of studies on the evaluation of the adsorption properties of three aromatic compounds containing simultaneously several active centers in the structures - fragments with double and triple bonds and an aminomethyl group: 1-propenyl-2-propargyloxy-3-diethylaminomethylbenzene (I), 1-allyl- 2-propargyloxy-3-diethylaminomethylbenzene (II) and 1-allyl-2-propargyloxy-3-morphoaminomethylbenzene (III). Based on the data of gravimetric studies, the adsorption-desorption constants (Kads), as well as the adsorption energy (Gads) were calculated, confirming the mechanism for protecting the steel surface from acid corrosion by forming chemisorbed adsorption layers on it.