IUPAC Nomenclature Organic Compounds (Part 2) of
I. Naming Alkenes and Alkynes ( Unsaturated Compounds) Alkanes contain single bonds only -ANE ending C n H 2n+2 (saturated) Alkenes contain a double bond -ENE ending C n H 2n (unsaturated) Alkynes contain a triple bond between -YNE ending C n H 2n-2 (unsaturated)
Naming Alkenes & Alkynes Parent Name = longest continuous chain of carbon atoms Use Greek prefixes to indicate the presence of multiple identical branching groups. Name & position of branching groups (if any) + Change the ending of the parent name to - ene or -yne Indicate where double or triple bond is located +
What is the parent name?Butene (double bond present) What position is the double bond located ? Must number parent chain so the carbon atoms containing the double bond have the lowest number. Use the lowest number to indicate where the double bond starts. 1 position Correct name is : 1-butene Note: Carbon atoms can only have four bonds CCCC 2 34 123 4 1
What is the parent name?hexene (double bond present) What position is the double bond located ? 3 position Location and number of groups: Note: Always number so the double bond gets the lowest number CH 3 CH CH 3 236145 41 2 3 6 5 Correct name is : 2,5-dimethyl-3-hexene 2,5-dimethyl
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