Propyl
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In organic chemistry, propyl is a three-carbon alkyl substituent with chemical formula -C3H7. It is the substituent form of the alkane propane.
For example:
This is propyl ethanoate, an ester. The propyl group is attached to the molecule after the middle oxygen.
There are two isomeric forms of propyl:
- with the substituent attached to one of the end carbons (called 1-propyl in the IUPAC nomenclature, or n-propyl in the old naming system); and
- with the substituent attached to the middle carbon (called 2-propyl in the IUPAC system, or isopropyl in the old system).
In addition there is a third, cyclic, form called cyclopropyl, or c-propyl. It is not isomeric with the other two forms, having the chemical formula -C3H5.
