Multicomponent heterocyclization of hydrazine,hydrogen sulfide,and formaldehyde

Multicomponent heterocyclization of hydrazine, hydrogen sulfide, and formaldehyde gave previously unknown bi-, tri-, and tetracyclic nitrogen- and sulfur-containing heterocycles. 3,7-Dithia-1,5-diazabicyclo[3.3.0]octane, 4,9-dithia-1,2,6,7-tetraazatricyclo[5.3.1.1^2,6]dodecane, and 4,9,14-trithia-1,2,6,7,11,12-hexaazatetracyclo[10.3.1.1^2,6.1^7,11]octadecane were obtained selectively, depending on the reaction temperature (0–60 °C).Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1652–1656, August, 2004.     

Crystallization of X-type zeolite from concentrated sodium silicate and aluminate solutions

Crystallization of an X-type zeolite from concentrated solutions of sodium aluminate (Al₂O₃ 90–330 g l^?1) and silicate (SiO₂ 110–180 g l^?1) was studied.     

New approach to the synthesis of dihydrothiopyrans using cobalt complexes

Institute of Organic Chemistry, Bashkir Science Center, Urals Branch, Russian Academy of Sciences, 450054 Ufa, Bashkortostan, Russia. Translated fromIzvestiya Akademii Nauk, Seriya Khimicheskaya, No. 12, pp. 2813–2814, December, 1992.     

One-pot catalytic synthesis of crown-like macroheterocycles

An efficient procedure has been developed for the synthesis of crown-like N-cycloalkyl-1,5,8-trithia-3-azacyclodecanes and N-cycloalkyl-1,11-dioxa-4,8-dithia-6-azacyclotridecanes by recyclization of saturated oxathiacycloalkanes with carbocyclic amines in the presence of SmCl₃ · 6 H²O as catalyst.     

First example of the interaction of fullerene C60 with hydrazoic acid

The one-pot synthesis of unsubstituted aziridinofullerene and triazolinofullerene was performed for the first time via the cycloaddition of fullerene C₆₀ with hydrazoic acid, which was generated in situ by the reaction of NaN₃ with H₂SO₄.     

Hydroacetoxylation of olefins with acetic acid genetated in situ from vinyl acetate in the presence of ruthenium complexes

Ruthenium complexes catalyze the decomposition of vinyl acetate releasing the acetic acid and its subsequent addition to linear and cyclic olefins.     

Effective synthesis of <Emphasis Type="Italic">N</Emphasis>-substituted 1,3,5-dithiazinanes by reactions of <Emphasis Type="Italic">N</Emphasis>-methyl-1,3,5-dithiazinane and 1,3,5-trithiane with aromatic amines

A novel procedure has been developed for selective synthesis of N-aryl-1,3,5-dithiazinanes, 1,2,6,7-tetrahydro-3,5,1,7-benzodithiadiazonine, and 6,7-dihydro-1,3,5,7-benzotrithiazonine by reactions of aniline derivatives with N-methyl-1,3,5-dithiazinane or 1,3,5-trithiane in the presence of transition and rare earth metal salts and complexes.