What is "propyl group"

n. the monovalent organic group C3H7- obtained from propane [syn: propyl, propyl radical]

In organic chemistry, propyl is a linear three- carbon alkyl substituent with chemical formula –. It is the substituent form obtained by removing one hydrogen atom attached to the terminal carbon of propane. 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.

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.

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 - C H.