Stereoisomers of 2-methyl-1-thiadecalin

A mixture of the geometrical isomers of 2-methyl-1-thiadecalin has been separated by a combination of adsorption column chromatography and preparative gas-liquid chromatography. The configuration of each isomer has been established by mass spectrometry and PMR spectrometry with the application of the Auwers-Skita rule.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 913–917, July, 1973.     

Reaction gas chromatography/mass spectrometry. 4—structure elucidation of cyclic sulphides by gas chromatography/mass spectrometry with the use of on-line hydrodesulphurization

A method for structure determination of cyclic sulphides within mixtures is described. It involves the use of a vapour phase hydrodesulphurization micro-reactor (Raney nickel) located between the chromatographic column and the mass spectrometer (hydrogen and deuterium are used as carrier and reagent gases). A comparative examination of the mass spectra of the cyclic sulphides, as well as of the hydrocarbons and their deuterio analogues (deuterium atoms are bonded to carbon atoms which had been attached to sulphur) derived from the sulphides under the catalytic conditions employed, permits unambiguous determination of the size of the heterocycle and the position of the substituents.     

On Fisher Subgroups of Finite Groups

Ukrainian Mathematical Journal - Let ? be a Fitting set of a group G, let π be a nonempty set of primes, and let L ≤ G. In this case, ? is called a Fischer π-set of G if...     

Preparation of S-arylsulfoniacyclane salts

S-(4-Hydroxyaryl)sulfoniacyclane perchlorates have been obtained by the condensation of thiacyclanes with phenols in the presence of perchloric acid, phosphorus oxychloride, and hydrogen peroxide, or by condensing thiacyclane S-oxides under the same conditions but without the hydrogen peroxide. The capacity for forming sulfonium perchlorates decreases sharply in the sequence tetrahydrothiophene >thiacyclohexane>thiacycloheptane > methylthiacyclohexane; no sulfonium salts are obtained under these conditions from 2,2,6,6-tetramethylthiacyclohexane, 2-methyl-1-thiadecalin, or 2,5-dimethyltetrahydrothiophene. The S-(4-hydroxyaryl)sulfoniacyclane perchlorates take part in double-decomposition reactions, giving picrates, chlorides, and phosphates. The action of caustic potash in methanol on S-(4-hydroxyphenyl)tetrahydrothiophenium salt forms a dimeric sulfobetaine.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1479–1482, November, 1973.     

Hartley Sets and Injectors of a Finite Group

Mathematical Notes - By a Fitting set of a group G one means a nonempty set of subgroups $$\mathscr{F}$$ of a finite group G which is closed under taking normal subgroups, their products, and...