The Z conformer of 1,2-ethenediol was
detected by
Rivilla and coworkers toward the
G+0.693–0.027 molecular cloud
near the center of the galaxy, as reported in 2022. The observations were made with the
Yebes 40m and
IRAM 30m telescopes. New spectroscopy of Z-1,2-ethenediol
by Melosso and coworkers was used to assign
transitions. The detection has evidently not yet been confirmed with additional observations or observed in
other sources. Spectral data for deuterated Z-1,2-ethenediol measured by
Nonne and coworkers is available.
Z-1,2-ethenediol is the
enol form of
glycolaldehyde, where a hydrogen atom has transferred
to oxygen to form a second –OH group (hence "diol"), and both groups are on the same ("Z"="zusammen") side
of the C-C double bond. There is also an
E conformer of 1,2-ethenediol ("E"="entgegen").
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