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Double/Triple Bonds vs. Functional Groups

Posted: Mon Mar 07, 2016 4:37 pm
by haleygamboa2E
When naming organic compounds, do all functional groups have priority over both triple/double bonds? Or are there some exceptions?

Re: Double/Triple Bonds vs. Functional Groups

Posted: Mon Mar 07, 2016 6:40 pm
by 604599327
Here is an important list of rules to remember when naming organic compounds with double and triple bonds (you might also want to go on this site to see other rules and examples):
http://www.chem.uiuc.edu/GenChemReferences/nomenclature_rules.html

1. The parent chain is numbered so that the multiple bonds have the lowest numbers (double and triple bonds have priority over alkyl and halo substituents).

2. When both double and triple bonds are present, numbers as low as possible are given to double and triple bonds even though this may at times give "-yne" a lower number than "-ene". When there is a choice in numbering, the double bonds are given the lowest numbers.

3. When both double and triple bonds are present, the -en suffix follows the parent chain directly and the -yne suffix follows the -en suffix (notice that the e is left off, -en instead of -ene). The location of the double bond(s) is(are) indicated before the parent name as before, and the location of the triple bond(s) is(are) indicated between the -en and -yne suffixes. See below for examples.

4. For a branched unsaturated acyclic hydrocarbon, the parent chain is the longest carbon chain that contains the maximum number of double and triple bonds. If there are two or more chains competing for selection as the parent chain (chain with the most multiple bonds), the choice goes to (1) the chain with the greatest number of carbon atoms, (2) the # of carbon atoms being equal, the chain containing the maximum number of double bonds.

5. If there is a choice in numbering not previously covered, the parent chain is numbered to give the substituents the lowest number at the first point of difference.