A. A. Shcherbakov

Reactions of sym-octahydrothioxanthylium salts with bases and structure of 4-(sym-octahydrothioxanthen-9-yl)-1,2,3,5,6,7,8-heptahydro-2H-thioxanthene

The reaction of sym-octahydrothioxanthylium salts with pyridine or aqueous sodium bicarbonate leads to the formation of 4-(sym-octahydrothioxanthen-9-yl)-1,2,3,5,6,7,8-heptahydro-2H-thioxanthene, whose structure was established by x-ray diffraction analysis.

Conversion of trans, trans-1-methoxy-3,5-diaryl-2-oxabicyclo[4.4.0]dec-3-enes into hemidithioacetals and 4H-thiopyrans. Structure of trans, trans-1-mercapto-3-phenyl-5-(4-methoxyphenyl)-2-thiabicyclo[4.4.0] dec-3-ene

The conversion of trans,trans-1-methoxy-3,5-diaryl-2-oxabicyclo[4.4.0]dec-3-enes into trans,trans-1-mercapto-3,5-diaryl-thiabicyclo[4.4,0]dec-3-enes or 2,4-diaryl-5,6-tetramethylene-4H-thiopyrans, which takes place when hydrogen Sulfide is reacted with the acetals in acetic acid with the use of gaseous hydrogen chloride as a catalyst, has been described. A mechanism for the reaction has been proposed. The structure and confirmations of the molecules have been determined by x-ray diffraction analysis and 13C NMR.

Interconversions, reactivities, and structures of isomeric hydrothiochromenes

Abstract2,4-Diphenyl-5,6,7,9-tetrahydrothiochromene was isomerized to 2,4-diphenyl-5,6-tetramethylene-4H-thiopyran in the presence of HCl and DCl. The relative thermodynamic stabilities of 2,4-diphenyl-5,6-tetramethylene-6H-thiopyran and the compound thus obtained were studied. The reactivities of the isomers of all three compounds in oxidation, disproportionation, and alkylation reactions are discussed. The structures of 2,4-diphenyl-5,6,7,9-tetrahydrothiochromene and 2,4-diphenyl-5,6-tetramethylene-4H-thiopyran were established by x-ray diffraction analysis.

Molecular structure of 4-phenyl-1-[3-(4-methyl-5-phenyl-1,2-dithiolio)]urazolide

Conclusions1.X-ray analysis has established that 4-phenyl-1-[3-(4-methyl-5-phenyl-1,2-dithiolio)]urazolide results from the reaction of 4-methyl-5-phenyl-1,2-dithiolene-3-thione with 4-phenyl-1,2,4-triazoline-3,5-dione.2.A structural formula is proposed for the zwitterion molecule.