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The kinetics of diethyl sulfide (Et2S) oxidation by aqueous sodium peroxoborate (Na2[В2(О2)2(ОН)4]) solutions in a wide acidity range (from [HClO4] = 1 mol/L to рН 12) has been studied using a kinetic distribution method. The kinetic data together with the results of 11B NMR spectroscopy demonstrate that the monoperoxoborate B(O2H) 3 - (OH) and diperoxoborate B(O2H)2(OH) 2 - anions are the active species in Et2S oxidation by sodium peroxoborate at рН 8–12. It is assumed that, at a high acidity of the medium ([HClO4] = 0.05–1.0 mol/L), peroxoboric acid (ОН)2ВООН or its protonated form (OH)2BOOH 2 + are direct reactants along with Н2О2 and HOOH 2 + .

The structures of 1-benzoyl-3-(pyridin-2-yl)-thiocarbamide C13H11N3O1S1 (I) and 2-benzoylimino-1,2,4-thiadiazole[2,3-a]pyridine C13H9N3O1S1 (II) are studied by X-ray diffraction. Structures I [a = 5.342(4) A, b = 20.428(5) A, c = 11.784(4) A, β = 90.55(2)°, Z = 4, space group P21/n) and II [a = 6.258(6) A, b = 18.068(14) A, c = 10.185(10) tA, β = 95.45(8)°, Z = 4, space group P21/n) are determined by direct methods and refined to R 1 = 0.0673 and 0.0802, respectively. In structure I, both intramolecular (involving the O atom) and intermolecular (involving the N and S atoms) hydrogen bonds are observed. The latter bonds are responsible for the formation of centrosymmetric molecular dimers. In structure II, a short intramolecular contact (2.168 A) is observed between the S and O atoms.

Treatment of N-phenyl-2-(1-R-indol-3-yl)succinimides with acetyl perchlorate leads to acylation of the benzene ring of the indole substituent.

A study has been made of thenitrationand bromination of 1-oxo-3,3,6-trimethyl-1,2,3,4-tetrahydrobenzo[bjfuro-, benzo[b]thieno-, and indolo[2,3-c]quinolines. It has been shown that the nitration is directed to the benzene ring (position 10). Bromination by molecular bromine takes place at the 6-CH3 group of the pyridine fragment and yields a mixture of the corresponding nwnobromomethyl and dibromomethyl derivatives, whereas a dimethylacetamide-bromine complex bronzinates the methylene group in position 2, forming the α-bromoketone. The Schmidt reaction of 1-oxo-3,3,6-trimetliyl-1,2,3,4-tetrahydrobenzo[b]furo-, benzol[b]thieno-, and indolo[2,3-c]quinolines have been investigated, as well as conversions of their oximes under conditions of the Beckmann rearrangement.

It was shown that benzo[c]pyrilium salts containing an acceptor group at position 4 react with benzylamine to form intermediate N-benzylisoquinolinium salts which then undergo conversion to 2-benzyl-6-benzylaminoisoquinolinium cations and napthylamines.

A study has been made of thenitrationand bromination of 1-oxo-3,3,6-trimethyl-1,2,3,4-tetrahydrobenzo[bjfuro-, benzo[b]thieno-, and indolo[2,3-c]quinolines. It has been shown that the nitration is directed to the benzene ring (position 10). Bromination by molecular bromine takes place at the 6-CH3 group of the pyridine fragment and yields a mixture of the corresponding nwnobromomethyl and dibromomethyl derivatives, whereas a dimethylacetamide-bromine complex bronzinates the methylene group in position 2, forming the α-bromoketone. The Schmidt reaction of 1-oxo-3,3,6-trimetliyl-1,2,3,4-tetrahydrobenzo[b]furo-, benzol[b]thieno-, and indolo[2,3-c]quinolines have been investigated, as well as conversions of their oximes under conditions of the Beckmann rearrangement.

Treatment of N-phenyl-2-(1-R-indol-3-yl)succinimides with acetyl perchlorate leads to acylation of the benzene ring of the indole substituent.

A study has been made of the reaction of 1,3-disubstituted bezothieno[2,3-c]pyrylium salts with hydrazine. It has been shown that 1,3-dialkyl-substituted benzothieno[2,3-c]pyrylium salts interact with hydrazine to give N-amino-1,3-dialkylbenzothieno[2,3-c]pyridines. The presence of a pyrylium ring on one of the positions of the phenyl group leads to a mixture of N-amino derivatives and 5H-[2,3]benzothieno[2,3-e]diazepines. In contrast, 1,3-diphenylbenzothieno[2,3-c]pyrylium perchlorate gives exclusively 5H-[2,3]benzothieno[2,3-e]diazepine.

We have studied the reactions of 4-ethoxycarbonylbenzo[c]pyrylium perchlorates with ammonia and primary amines. We have obtained previously unknown derivatives of isoquinoline and 1-naphthylamine.

The reactions of N-methallyl derivatives of cyclic amides and imides with acetic and propionic anhydride have been studied in the presence of perchloric acid. The reaction products have been found to be pyrylium and oxazolinium salts. The relationship between the reaction pathway and the structure of the imide or amide starting material has also been determined. Pyrylium salts have been converted to their corresponding pyridine bases.