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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.〔 (IUPAC Nomenclature - Acyclic Hydrocarbons Rule A-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.〔 (IUPAC Nomenclature - Acyclic Hydrocarbons Rule A-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.〔 (IUPAC Nomenclature - Acyclic Hydrocarbons Rule A-1. )〕 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. ==Examples== This is propyl ethanoate, an ester. The propyl group is attached to the molecule after the middle oxygen. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「propyl」の詳細全文を読む スポンサード リンク
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