Synthesis and stereochemistry of 3-hydroxy-4-alkylthiosulfolanes

4-Hydroxy-2-sulfolene, 3-hydroxy-4-chlorosulfolane, and 3,4-epoxysulfolane react with thiols in alkaline media to give mixtures of cis,trans-3-hydroxy-4-alkylthisulfolanes in a ratio of 23.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1631–1636, December, 1979.Original article submitted September 4, 1978; revision submitted June 1, 1979.     

Reaction of sulfur halides with unsaturated compounds

Conclusions Oxidation of 2,9-dichloro-13-thiabicyclo[8.2.1]cis-5-tridecene with tert-amyl hydroperoxide leads to the respective exo-sulfoxide and also to a derivative of 13-thiabicyclo[7.3.1]cis-5-tridecene, which is a product from rearrangement with enlargement of the thiacyclopentane ring to a thiacyclohexane ring.See [1] for Communication 11.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 384–389, February, 1976.     

Temperature-induced delocalization of excitations in GaAs/AlAs type-II superlattices

This paper describes investigations of the photoluminescence spectra of heterostructures containing short-period type-II GaAs/AlAs superlattices grown both within the regime where the heterojunction is smoothed, and in a regime where it is not smoothed, in the temperature range 10–40 K. A quantitative analysis of the experimental data shows that the quenching of exciton luninescence in the majority of cases is characterized by a single value of the activation energy E ₂=8±1 meV which coincides with the value of the binding energy of an X-Γ exciton. It is concluded that the primary reason for quenching in this temperature interval is thermal dissociation of the exciton into a pair of free carriers whose delocalization is accompanied by nonradiative recombination at traps. It is observed that smoothing the heterojunction leads to an increase in the probability of quenching by 1–2 orders of magnitude on the average. Fiz. Tverd. Tela (St. Petersburg) 40, 1140–1146 (June 1998)     

PMR spectra ard structure of 3,4- and 2,5-disubstituted sulfolanes

Conclusions Based on studies of the PMR spectra of 3,4- and 2,5-disubstituted sulfolanes it has been shown that the difference in the chemical shifts of the geminal protons and the values of the chemical shifts of the protons associated with substituents are reliable criteria for establishing the configuration of the disubstituted five-membered cyclic compounds.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 1029–1033, May, 1980.The authors would like to thank U. M. Dzhemilev for donating the 2,5-divinylsulfolanes for investigation.