In organic chemistry, butyl is a four-carbon alkyl radical or substituent group with general chemical formula -C4H9, derived from either of the two isomers of butane. The isomer n-butane can connect in two ways, giving rise to two "-butyl" groups: \n* If it connects at one of the two terminal carbon atoms, it is Normal butyl or n-Butyl: CH3–CH2–CH2–CH2– (fully systematic name: butyl) \n* If it connects at one of the non-terminal (internal) carbon atoms, it is Secondary butyl or sec-Butyl: CH3–CH2–CH(CH3)– (fully systematic name: 1-methylpropyl) The second, branched isomer of butane, isobutane, can also connect in two ways, giving rise to more two groups: \n* If it connects at one of the three terminal carbons, it is Isobutyl: (CH3)2CH–CH2– (fully systematic name: 2-methylpropyl) \n* If it connects at the central carbon, it is Tertiary butyl, tert-Butyl or t-butyl: (CH3)3C– (fully systematic name: 1,1-dimethylethyl)

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