Synthesis of modified hexaprenol WC5OH from glutaraldehyde derivatives

A new procedure was developed for building linear Z-isoprenoids from glutaraldehyde derivatives as nonisoprenoid precursors, and is illustrated by the synthesis of hexaprenol WC₅OH.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 89–97, January, 1990.     

Stereospecific synthesis of octaprenols WT3C4OH and WT3C3TOH

A total synthesis of the above prenols has been carried out.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2333–2338, October, 1991.     

Synthesis of N-benzyloxycarbonyl-N-methylaminoacids from oxazolidine-5-one derivatives

Hydrogenolysis of 3-benzyloxycarbonyloxazolidine-5-one and 3-benzyloxycarbonyl-4-benzyloxazolidine-5-one by Et₃SiH in the presence of F₃.CCO₂H is demonstrated to be a convenient method for preparing substituted N-methylaminoacids. In contrast with catalytic hydrogenation on Pd/C catalyst, the benzyloxycarbonyl is not removed and the methyl is not lost using this method.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 681–683, May, 1992.     

Interactions of vibrationally excited CO2 with oxygen and sulfur atoms

The classical-path method has been used in calculations on O+CO₂ CO+ O₂ and S+CO₂ CO+SO for vibrational-translational disequilibrium. The vibrational-energy localization in various modes in CO₂ affects the reaction cross section and rate constant. The energy distributions in the products have been calculated.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 24, No. 4, pp. 428–434, July–August, 1988.     

Reactions of hexamethylditin and trimethyltin sulfide withN-thio-derivatives of phthalimide

The initial formation of organotin derivatives with Sn-S-N bonds in heterolytic reactions of hexamethylditin or trimethyltin sulfide withN-(chlorothio)phthalimide is suggested. Subsequent interaction of these compounds with sulfenyl chloride affordsN, N-thioorN, N-dithiobisphthalimide. Homolytic reaction of hexamethylditin withN, N-dithiobisphthalimide also occursvia an organotin intermediate, which, in the absence of a nucleophilic reagent, eliminates sulfur and converts intoN-trimethylstannylphthalimide.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2111–2114, December, 1993.     

X-ray diffraction and spectral studies of 1-phenyl-3-methyl-4-(2′,4′-Dimethylphenylazo)-pyrazolone-5

The molecular and crystal structures of 1-phenyl-3-methyl-4-(2,4-dimethyl-phenylazo) pyrazolone-5 were determined. In the crystal the molecule exists as the hydrazone tautomer. The pyrazole ring is planar, and the substituents are practically coplanar with it. The molecule contains an intramolecular NH...O hydrogen bond that closes a practically planar six-membered ring (N...O, 2.77 (I), H...O 2.14 Å, angle at H(N(4)) hydrogen 131 °). The x-ray diffraction data agree with the spectral data and with the CNO calculation.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 816–821, June, 1985.     

Capillary chromatography of polyfluorinated carboxylic esters

Retention indices and dI/dT values were obtained for members of six homologous and six pseudohomologous series of polyfluorinated saturated carboxylic esters on capillary columns with OV-101 or XE-60 as stationary phase. There was a nonlinear dependence of retention indices of fluorinated fatty acid esters on carbon chain length of homologs with m, n=1–6. A universal correlation equation was shown to describe the chromatographic behavior of polyfluorinated carboxylic esters.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1740–1745, August, 1991.