Talk:Diene

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What's the difference between allenes and cumulated dienes? From the description, it looks like they're the same thing. Anyone know enough chemistry to clear this one up? Grendelkhan 07:52, 2004 Apr 22 (UTC)

Allene is an archaic, non-systematic, name for propadiene that is still allowed by IUPAC, similar to ethylene/ethene. Propadiene (really techinally propa-1,2-diene) is the simplest comulated alkadiene, so it's common name is sometimes used by the entire group of comulated alkadienes, although this should be avoided because of possible ambiguation.

On a different note, this article really should reside at alkadiene, as that's the IUPAC approved name for this class of chemicals, with Diene as a redirect. Gentgeen 10:54, 14 May 2004 (UTC)