Basic Organic Nomenclature
4. Functional Groups with Suffix Only
III. Alkenes (i)
The -ene name is given to the C,C double bond function. Like the -yne function, the double bond
may appear anywhere in the chain of carbon s and so requires a position identifier. Study the
following simple examples of the alkene family, given with their names and models:
Note from the above names that the locant is only the first
number of the two which identify the position of the double bond, exactly paralleling the situation
with the triple bond already studied. Thus although the double bond in
hex-1-ene is between carbons numbered 1 and 2 in the chain, only the first is required to
position the double bond, the second being understood to be the next higher number.
Notice also the positioning of the locant, immediately prior to the group it is positioning.
Part 2 of Alkenes: Naming alkene stereoisomers
Next page : Functional Groups with Suffix or Prefix. I.
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