In 2019, a study by
Martin-Drumel et al. reported
new experimental measurements of the rotational spectra and the associated constants for vinyl mercaptan,
C2H3SH, in both of its
structures differ in whether the H atom bonded to S is on the same (syn) or opposite (anti) side
of the C–C double bond. The image on this page shows the anti form. On the basis of the spectra,
searches for the molecule toward Sgr B2(N) were made in the
EMoCA spectrum of
Belloche et al. Neither
conformer was found to be present in the source.
Vinyl mercaptan (or ethenethiol) is not
stable enough to manufacture and store. In the experimental work described above, it was formed in the lab
via RF-discharge applied to
ethane-1,2-dithiol. In a previous study,
Almond et al. formed vinyl mercaptan by irradiating a
mixture of acetylene and hydrogen sulfide with ultraviolet light.