What would this aromatic boron compound be called?

enter image description here

  • 1
    $\begingroup$ Label the atoms. $\endgroup$
    – user38977
    May 14, 2017 at 16:28
  • 7
    $\begingroup$ Is this 1H-Borepin $\endgroup$
    – Mesentery
    May 14, 2017 at 16:41
  • $\begingroup$ @blue I used CPK coloring code for atoms. See en.wikipedia.org/wiki/CPK_coloring $\endgroup$ May 15, 2017 at 0:45
  • 4
    $\begingroup$ @PrittBalagopal You should mention that in your question to avoid confusion. I wasn't sure what colouring scheme you were using. $\endgroup$
    – user38977
    May 15, 2017 at 1:04

2 Answers 2


According to the current version of Nomenclature of Organic Chemistry – IUPAC Recommendations and Preferred Names 2013 (Blue Book), heteromonocyclic compounds with up to and including ten ring members are named by the extended Hantzsch–Widman system. According to P-, this also applies to heterocyclic parent hydrides containing Group 13 (boron group) atoms.

The Hantzsch-Widman system stem for an unsatured 7-membered ring is “epine”. Therefore, the preferred name for the compound that is given in the question is 1​H-borepine.
The name 1​H-1-boracyclohepta-2,4,6-triene is not recommended.

  • 2
    $\begingroup$ Unsaturated or fully conjugated 7-member ring? Do we use epine for the cycloalkene formulated C7H12? $\endgroup$ May 14, 2017 at 17:48
  • $\begingroup$ @OscarLanzi H-W system is for heterocycles, not alkenes. $\endgroup$
    – Mithoron
    May 17, 2017 at 23:01
  • $\begingroup$ Then presumably the words "fully conjugated" should be used instead of "unsaturated". $\endgroup$ May 17, 2017 at 23:14

If the black coloured are carbon atoms and the white coloured are hydrogen atoms, and the pink one is Boron. Then it should be 1H-Borepine.

enter image description here [Source: Chemspider]

See here for why it is aromatic.

  • 4
    $\begingroup$ There is a standard color code for ball and stick models. True, carbon = black, hydrogen = white, boron = that pretty pink color. Some others : oxygen = red, nitrogen = blue, chlorine = yellowish green like the gas. $\endgroup$ May 14, 2017 at 17:41
  • 1
    $\begingroup$ @Mesentery Thanks for your answer. There is in fact a color code for atoms. See en.wikipedia.org/wiki/CPK_coloring $\endgroup$ May 15, 2017 at 0:42

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.