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From left to right: the two isomeric groups propyl and 1-methylethyl (or isopropyl), and the non-isomeric cyclopropyl group.

In organic chemistry, propyl is a linear three-carbon alkyl substituent with chemical formula CH
. It is the substituent form obtained by removing one hydrogen atom attached to the terminal carbon of propane.[1] A propyl substituent is often represented in organic chemistry with the symbol Pr (not to be confused with the element praseodymium).

There is an isomeric form of propyl named 1-methylethyl or isopropyl obtained by removing a hydrogen ion (proton) attached to the middle carbon of propane.[2]

Linear propyl is sometimes termed normal and written with a prefix n- (i.e., n-propyl). However, n- is redundant because the absence of any prefix implies an unbranched propyl.[3]

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.


Propyl ethanoate, also called propyl acetate.

This is propyl ethanoate, an ester. The propyl group is attached to the molecule after the middle oxygen.

Other examples[edit]

See also[edit]