80193-49-3Relevant academic research and scientific papers
Disproportionation of condensed thiopyrans with trifluoroacetic and deuterotrifluoroacetic acids
Klimenko,Stolbova,Kharchenko
, p. 998 - 1001 (2007/10/02)
The disproportionation of isomeric 2,4-diphenyl-5,6-tetramethylene-4H-thiopyran,-6H-thiopyran, and 2,4-diphenyl-5,6,7,9-tetrahydrothiochromene with trifluoroacetic and deuterotrifluoroacetic acids was investigated for the first time. The direction of protonation of the sulfides was established, and this made it possible to form a judgment regarding the structure of the intermediate carbonium ions, which are hydride-ion acceptors. The correctness of the mechanism of disproportionation of condensed two-ring sulfides with a 4H-thiopyran ring was proved. A mechanism for the disproportionation of isomeric 2,4-diphenyl-5,6-tetramethyl-6H-thiopyran and 2,4-dipheny1-5,6,7,9-tetrahydrothiochromene was proposed.
CONFIGURATION AND CONFORMATION OF 3,5-DIPHENYL-2-THIABICYCLO DECANE
Klimenko, S. K.,Stolbova, T. V.,Evtushenko, I. Ya.,Kharchenko, V. G.
, p. 1006 - 1009 (2007/10/02)
The PMR spectra of 3,5-diphenyl-2-thiabicyclodecane and its 4,6-dideuteroderivative and S-oxide in the presence of Eu(dpm)3were studied.It was established that 3,5-diphenyl-2-thiabicyclodecane has a cis, cis, cis configuration.The extremal spin-spin coupling constants (SSCC) constitute evidence for conformational rigidity of the investigated condensed system, which exists in the form of a puckered chair.The formation of the same cis, cis, cis isomer of 3,5-diphenyl-2-thiabicyclodecane in the case of catalytic hydrogenation, disproportionation with trifluoroacetic acid, and ionic hydrogenation constitutes evidence for stereospecificity of the processes involving the reduction of the double bonds in 2,4-diphenyl-5,6-tetramethylene-6H-thiopyran.
