Die ir- und raman-spektren des dithioessigsäure-methylesters und des dimethyltrithiocarbonats

Energetics of the Lighter Chalcogen Analogues of Carboxylic Acid Esters

“…The previous experimental ,,− and computational ,,,,− studies on a variety of RC(X)YR′ species indicate that the Z conformation is preferred over the E conformation (Chart ), although the difference in stability varies with the R and R′ substituents. The IR and (resonance) Raman investigations of methyl acetate H 3 CC(O)OCH 3 , S -methyl thioacetate H 3 CC(O)SCH 3 , , O -methylthioacetate H 3 CC(S)OCH 3 , and methyl dithioacetate H 3 CC(S)SCH 3 ,, also suggest that all of the heavy atoms lie in the same plane. In agreement with these results and those from earlier computational work on H 3 CC(O)OCH 3 , , H 3 CC(O)SCH 3 , − and H 3 CC(S)OCH 3 , the G2 and G3 results for these compounds show that the Z conformer, with C S symmetry, is the more stable of the two conformers (Table ).…”

“…For example, the relative stability of the two possible conformations has been important in interpreting spectral data ,− and photodecomposition data . The previous experimental ,,− and computational ,,,,− studies on a variety of RC(X)YR′ species indicate that the Z conformation is preferred over the E conformation (Chart ), although the difference in stability varies with the R and R′ substituents. The IR and (resonance) Raman investigations of methyl acetate H 3 CC(O)OCH 3 , S -methyl thioacetate H 3 CC(O)SCH 3 , , O -methylthioacetate H 3 CC(S)OCH 3 , and methyl dithioacetate H 3 CC(S)SCH 3 ,, also suggest that all of the heavy atoms lie in the same plane.…”

The infrared, Raman, and resonance Raman spectra and normal coordinate analysis of methyl and ethyl dithioacetate

“…The dithioesters that are slightly more complex than utility of the approach depends on our ability to methyl and ethyl dithioacetate are discussed with interpret the RR spectrum of the dithioester func-special attention being paid to the consequences of tion. The knowledge of the vibrational (5)(6)(7)(8)(9)(10) and ~sOmerism about chemical (1 1) properties of dithioesters is minimal c+c (+) and -S+C ~N R C C NO. 19738. bonds.…”

“…There is, however, enough evidence in the literature to establish with reasonable certainty the preferred conformer for dithioesters. Infrared and microwave investigations (13) of methyl thiol formate (HC(=O)SCH,) and infrared and Raman studies of CH,(=S)SCH, (5) indicated that only the s-cis conformer (Fig. I), with the heavy atoms in a single plane, was present in these compounds.…”

UV Laser Chemical Vapor Deposition of Nano‐Chained Copolymer from Carbon Disulfide and Ethene

“…These polymers show four intense bands in the C S stretch (1 000-1 200 cm 1 , similar to those of 1,1-dimethylthioethene [36] and dimethyltrithiocarbonates [37] ) region (instead of the two bands observed in excess of CS 2 ) and are indicative of specific surroundings consisting of the (-C-(C S)-S-) and (-S-(C S)-S-) configurations.…”