The method of obtaining single-ended diallyldisulfide

The invention relates to a method for producing alkyl - or alkylalkoxysilane, which can serve as extractants of noble metals, flotation reagents, additives in oils, and can be used as starting compounds for the production of biologically active compounds, alkyl - or alkylalkoxysilane interaction of the corresponding mercaptan with alkyl - or alkenylphenol in the presence of an alkaline agent

The invention relates to a composition based on dimethyl disulfide (DMDS)

The invention relates to the synthesis of serosoderjaschei additives with enhanced extreme-pressure, anti-wear properties, high thermal and oxidative stability

The invention relates to the field of synthesis of serosoderjaschei additives with enhanced extreme-pressure, anti-wear properties, high thermal and oxidative stability

The invention relates to a process for the synthesis of polysulfide oligomers used as the basis sealant, adhesive and coating materials in various industries, including optical and optoelectronic engineering

The invention relates to the chemistry of acyclic sulfides, specifically to an improved process for the preparation of dimethyl sulfide, which can be used as odorant and the source of raw material for the synthesis of dimethyl sulfoxide

The invention relates to a composition based on dimethyl disulfide (DMDS)

The invention relates to an improved process for the preparation of organic disulfides of the General formula R-S-S-R

The invention relates to the field of aromatic polysulfides, particularly to a method of obtaining policiales-(2,6-di-tert-butylphenol), which is used as antioxidants for high molecular weight compounds and intermediate for obtaining 2,6-di-tert-butyl-4-mercaptoethanol

Invention relates to a method of removing mercaptans from hydrocarbons through oxidation. The method involves: a) bringing a hydrocarbon or mixture of hydrocarbons which contain one or more mercaptans of general formula R-SH, in which R is a C₁-C₅₀-aliphatic or C₆-C₃₀-aromatic hydrocarbon, into contact with a system containing iron (III), heteropolyacid, having redox properties, and water, where the heteropolyacid is selected from heteropolyacids of general formula (I): H_nXV_yM_(12-y)O₄₀ in which n is an integer from 4 to 6 and is equal to 3+y; X is an element selected from a group comprising P and As; y is an integer from 1 to 3; and M consists of Mo and W; b) oxidation of mercaptans to corresponding (di)sulphides as a result of the oxidative effect of iron (III), which is reduced to iron (II); c) separation of the aqueous phase from the organic phase; d) re-oxidation of iron (II) to iron (III) in a gas stream containing oxygen; e) recirculation of the system containing iron (III), heteropolyacid and water to the oxidation operation (a).

Palladium-copper catalyst for homogeneous selective oxidation of thiols combines a functional binuclear thiolate bridge coordination compound of palladium (II) and a modifying thiolate complex of copper (I), having general formula [pd₂ ^II(µ-SR)₂(NH₃)₄]·{Cu¹ _k(SR)_m} (I). SR is a residue of a thiolate ligand of glutathione or acetylcysteine, k ranges from 2 to 14, m≥3k. The invention also discloses a catalytic combination which stimulates proliferative activity, a pharmacological combination for enhancing therapeutic activity of a purine and(or) pyrimidine base or lithium ions, pharmaceutical compositions which stimulate proliferative activity, and for enhancing therapeutic activity of said bases or lithium ions, and methods for therapeutic treatment of a patient based on said catalyst.

Invention relates to modification of oil paraffins, namely, to preparing sulfurous compounds used as additives in manufacturing bitumen in petroleum chemistry. Method involves interaction of paraffin with sulfur in the presence of alkaline metal persulfate or alkaline-earth metal persulfate, or ammonium persulfate. Invention provides preparing modified paraffins for a single step.

Invention relates to the compounds of the formula and their pharmaceutically acceptable salts used as inhibiting agent in the relation of fermentative beta-secretase and it also relates to pharmaceutical compositions based on the formula. In general formula one of R_N and R_N' represents hydrogen, and another represents - C(=O)-(CRR')_0-6R₁₀₀, or where R₄ is chosen from the group including H; NH₂; -NR₅₀CO₂R₅₁; -(C₁-C₄)-alkyl-NR₅₀CO₂R₅₁; where n₇ is equal to 0, 1, 2 or 3; R₅₀ represents H or C₁-C₆alkyl; R₅₁ is chosen from the group including phenyl-(C₁-C₄)-alkyl and (C₁-C₆)-alkyl; X is chosen from the group including -(C₁-C₆)-alkylidenyl optionally substituted with 1, 2 or 3 metal groups; Z is chosen from the group including bond, SO₂, SO and S; Y stands for (C₁-C₁₀)-alkyl; R₁ represents -(C₁-C₆)-alkylphenyl where phenyl ring is optionally substituted by 1, 2, 3 or 4 halogen atoms; R and R' independently represent hydrogen or (C₁-C₆)-alkyl; R₂ represents hydrogen; R₃ represents hydrogen; R_c represents - (CR₂₄₅R₂₅₀)_0-4-aryl; where aryl is optionally substituted by 1, 2 or 3 R₂₀₀; R₂₀₀ is chosen from the group including (C₁-C₆)-alkyl optionally substituted with 1, 2 or 3 groups R₂₀₅; halogen; C=N; R₂₀₅ stands for halogen; R₂₄₅ and R₂₅₀ in each case stands for H; either R₂₄₅ or R₂₅₀ are taken together with carbon atom whereto attached to form carbocycle from 3, 4, 5, 6 or 7 carbon atoms; R₁₀₀ represents 5-6-merous heteroaryl with 1-2 heteroatoms chosen from nitrogen and sulphur, -phenyl-W-heteroaryl where heteroaryl is 5-6-merous ring containing 1-2 heteroatoms, chosen from nitrogen and oxygen and where cyclic parts of each group are optionally substituted by 1, 2 or 3 groups independently chosen among C₁-C₆alkyl, -(CH₂)_0-4-CO₂-NR₁₀₅R'₁₀₅, -(CH₂)_0-4-SO₂-NR₁₀₅R'₁₀₅, -(CH₂)_0-4-N(R₁₅₀)-CO-R₁₀₅, -(CH₂)_0-4-N(R₁₅₀)-SO₂-R₁₀₅; W represents -(CH₂)_0-4; R₁₀₅ and R'₁₀₅ independently represent (C₁-C₆)-alkyl optionally substituted with -NH₂ or halogen; R₁₅₀ represents hydrogen.

Invention relates to methods of producing sulphur-containing compounds, specifically dimethyl sulphide which is used as an odorant and starting material for synthesis of dimethyl sulphoxide which is used as a medicinal agent, solvent and extractant. Described is a method of producing dimethyl sulphide by converting dimethyl disulphide in the presence of methanol at atmospheric pressure and temperature 300-380°C using a catalyst containing gamma-aluminium oxide and 0.73-7.3 wt % chromium oxide. The weight ratio of methanol to dimethyl disulphide is equal to 0.8-0.9 g/g and contact time is 0.1-0.35 s.

Invention relates to organic chemistry, and specifically to a method of producing sulphur-containing homofullerenes of general formula (1): R = Am (pentyl), Cy (cyclohexyl), which is characterised by that C₆₀-fullerene reacts with sulphur-containing diazoalkanes, produced in situ via oxidation of corresponding hydrazones of ketosulphides with MnO₂, of general formula N₂C(Me)CH(Me)CH₂S-R, where R = Am (pentyl), Cy (cyclohexyl), in the presence of a three-component catalyst {Pd(acac)₂:2PPh₃:4Et₃Al}, taken in molar ratio C₆₀ : diazocompound : Pd(acac)₂ : PPh₃ : Et₃Al=0.01:(0.01-0.03):(0.0015-0.0025):(0.003-0.005):(0.006-0.01), preferably 0.01:0.02:0.002:0.004:0.008, in o-dichlorobenzene as a solvent at temperature 20°C for 0.25-1.0 hours.

There are presented drug derivatives wherein said derivatives contain a H₂S-releasing fragment of 4-hydroxythiobenzamide which is either covalently bond with the drug, or forms a pharmaceutically acceptable salt with the antilipidemic drug.

Invention relates to masking the odour of organic sulphides and more specifically to alkyl or dialkyl sulphides, particularly dimethyl sulphide, as well as oxides thereof and particularly dimethyl sulphoxide by adding to said organic sulphides at least one odour masking agent which contains at least one monoester, at least one di- or triester, at least one alcohol, at least one ketone and optionally at least one terpene.

Invention relates to a method of obtaining α-ketoacids, as well as their derivatives of general formula or , where R¹ stands for either a branched or linear C₁-C₁₈alkyl group and, where R¹ is optionally substituted with -SH or -SCH₃, R² stands for -OR"', where R"' represents a hydrogen atom or a branched or linear C₁-C₈alkyl group, both residues R³ together represent C₂-C₈alkanediyl and together form a ring or both residues R³ and R"' together represent a part of a C₃-C₈alkanetriyl group of general formula -R³(CH-)R"'- and together form a bicyclic group, consisting in the following: a) aldehyde R¹ CHO is subjected to interaction with similar or different thiols of formula R⁴-S-H, where R⁴ stands for a branched or linear, optionally substituted C₁-C₆alkyl group, with obtaining respective dithioacetal, b) formed dithioacetal is subjected in the presence of a strong base to interaction with carbonyl-containing electrophile and further hydrolysis with obtaining α,α-(dithio)carboxylic acid or its derivatives of formula , where R⁵ represents a hydrogen atom or a branched or linear C₁-C₆alkyl group, and residues R⁴ and R¹ have values given above, and c) α,α-(dithio)carboxylic acid or its derivatives of formula are converted by solvolysis carried out at acid catalysis in the presence of at least 1 molar equivalent of water into α-ketoacid or its derivatives of general formula (I) or (II) with the separation of thiols of formula R⁴SH. The invention also relates to an intermediate product of formula .