# Why doesn't EDTA have a double bond?

EDTA (Ethylenediaminetetraacetic acid) has a structure like this

But why, as the name 'Ethylene' suggests, doesn't it should have a double bond between carbons?

• As far as trivial names are concerned, this is one possibility to describe it. Another one is that ethylene is the name for the subunit $\ce{C2H4}$. Just like methylene $\ce{CH2}$ in methylene dichloride ($\ce{CH2Cl2}$) or propylene ($\ce{C3H6}$) in propylene glycol. So it actually describes the structure and not the origin. Names for polymers, however, are always derived from the monomer(s). Apr 28, 2014 at 3:49