Some
of the most common alcohols are represented above. The traditional
names methyl, ethyl, propyl, and butyl alcohols are familiar, but
"amyl" alcohol instead of "pentyl" for the five-carbon
alcohol is an historical oddity. From hexyl alcohol on, the Greek
numerical prefixes are used. In the systematic nomenclature, alcohols
are identified by a single name ending in "-ol", beginning
with methanol, ethanol, propanol, butanol, pentanol, hexanol, and
continuing with the Greek prefix for the number of
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atoms
in the longest carbon chain that can be traced through the molecule.
The position of the -OH group is identified by the number of the
carbon atom to which it is attached. Thus n-propyl alcohol
(above) is 1-propanol in the systematic naming, and isopropyl alcohol
is 2-propanol because the -OH group is attached to the second carbon
atom in the chain.
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