What is the systematic name of carbonyl sulfide? My professor commented that the systematic name was "very odd" so he didn't bother to mention it. Is it really that odd? And what is it, actually?

I found the name "Thioxomethanone". Is that really odd? From my limited knowledge, I've seen the root "thiol" before in describing something with a sulfur in it. So at least the root doesn't seem weird. I also see "oxo." There's an O in OCS.

  • 1
    $\begingroup$ well, "thioxomethanone" name surely is decipherable, like e.g. "benzene-1-ylwater" or "norcresol" for phenol :) but is it even organic compound? $\endgroup$
    – mykhal
    Jul 24, 2018 at 9:56

2 Answers 2


I'm not sure if there's definitive answer to not-yet-asked question, whether this compound can be considered organic or inorganic compound.

While organic nomenclature books do not mention it (acording to the current rules it might be called sulfanylidenemethanone, which is somewhat absurd), official IUPAC inorganic chemistry nomenclature (Red Book 2005, table IX, p. 292) lists two names for this compound:

  • carbonyl sulfide
  • oxidosulfidocarbon

Your mentioned (organic) systematic name thioxomethanone is just a variant of already mentioned sulfanylidenemethanone, as S= group's preferred name ("preselected prefix") is now sulfanylidene-* instead of thioxo- (rule P-

*) see analogy H2C=/H3C− methylidene-/methyl-, and
S=/HS− sulfanylidene-/sulfanyl- (older name: mercapto-)


Wikipedia lists the IUPAC name as "carbon oxide sulfide." Odd? Sounds kind of logical to me.

  • $\begingroup$ Is IUPAC the same as systematic name? $\endgroup$
    – Dissenter
    Jun 21, 2014 at 13:42
  • $\begingroup$ Yes, it's the only system I'm aware of for naming compounds. $\endgroup$
    – ron
    Jun 21, 2014 at 13:47
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    $\begingroup$ youtu.be/QBJk_L0NmMg?t=6m1s $\endgroup$
    – Dissenter
    Jun 21, 2014 at 13:59
  • $\begingroup$ I think this is what he came across: chemspider.com/Chemical-Structure.9644.html $\endgroup$
    – Dissenter
    Jun 21, 2014 at 14:20
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    $\begingroup$ please be noted that the Wikipedia article was improved to contain referenced IUPAC names (see my answer) $\endgroup$
    – mykhal
    Jul 24, 2018 at 9:31

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