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Alkene_Alkyne_Nomenclature - Example...

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O H General Rules: 1) Find the longest carbon chain containing double and/or triple bonds--name the chain. 2) Priorities: double bonds given priorities over alkyl groups, halogens, triple bonds (when there is a choice). 3) Hydroxyl groups take priority over anything. 4) If both double bonds and triple bonds are present, lowest numbers used. If there is a choice, double bonds have priority over triple bonds. Examples: 1-butene 2-butene 3-methyl-1-butene 5-methyl-4-hexen-1-ol 1-penten-3-yne OH 5) If cyclic structure, automatically give the alkene or alkyne bond the 1,2 priority. Then number the carbon cyclic chain as normal. If an alcohol exists on the ring, it gets the 1 priority, and then number the carbon cyclic chain so that the alkene or alkyne bond gets the lowest number possible. When naming, signify the carbon at which the alkene or alkyne bond starts.
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Unformatted text preview: Example: 2-methyl-2-cyclohexen-1-ol H H Cl Cl Cl H H Cl F H Cl Br Cl H F Br 6) If stereochemistry is involved, cis/trans must be indicated. Example: cis-1,2-dibromoethene trans-1,2-dibromoethene 7) If more than tri or tetra substituted alkene or alkyne bond, E/Z nomenclature must be indicated. Give each substituent a priority by their molecular weights. Example: #1 #1 Cl>F Br>H (Z) (Z)-2-bromo-1-chloro-1-fluoroethene #1 Cl>F Br>H (E) #1 (E)-2-bromo-1-chloro-1-fluoroethene (Note: In this case, the carbon chain was numbered this particular way because the carbon that has the chlorine and fluorine attached to it is what we call "most substituted" carbon, meaning that this particular carbon has many substituents on it other than hydrogen.) (E)-4-ethyl-5-methylnonene (Z)-4-ethyl-5-methylnonene...
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Alkene_Alkyne_Nomenclature - Example...

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