Propyl group

In organic chemistry, a propyl group is a three-carbon alkyl substituent with chemical formula −CH2CH2CH3 for the linear form.

This substituent form is 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).

[2] Linear propyl is sometimes termed normal and hence written with a prefix n- (i.e., n-propyl), as the absence of the prefix n- does not indicate which attachment point is chosen, i.e. absence of prefix does not automatically exclude the possibility of it being the branched version (i.e. i-propyl[citation needed] or isopropyl).

[1][failed verification] In addition, there is a third, cyclic, form called cyclopropyl, or c-propyl[citation needed].