Cyclic Hydrocarbons

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Cyclic Hydrocarbons
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Examples
Testosterone
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• Hydrocarbon ring structures.
• When two ends of a hydrocarbon chain join together

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Naming and Drawing Cyclic hydrocarbons

1. Draw the ring, according to the root of the name.
2. Choose one of the ring carbon atoms as carbon
   number 1. Place each branch accordingly.

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Draw a condensed structural diagram for 1, 2,
4-trimethylcycloheptane

1. Draw the ring, according to the root of the name.

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Choose one of the ring carbon atoms as carbon
number 1. Place each branch accordingly.
CH3
CH3
CH3
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Naming Cyclic Hydrocarbons

1. Identify the branches.
2. Number the carbons in the ring, in either
   direction, so that the branches have the lowest
   possible position numbers.
3. Write the prefix.
4. Write the root cyclo- plus the number of carbon
   atoms in the ring
5. Write the suffix name (-ane, ene, yne)

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Name the following molecule

• Identify the branches. (in red)
• Number the carbons in the ring, in either
  direction, so that the branches have the lowest
  possible position numbers. (in blue)

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1. Write the prefix. (3-ethyl-1, 1-dimethyl)
2. Write the root cyclo- plus the number of carbon
   atoms in the ring
3. Write the suffix name (-ane, ene, yne)
   (cyclohexane)

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3-ethyl-1,1-dimethyl cyclohexane
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Name this compound

1. Identify the branches. (in red)
2. Number the carbons in the ring, in either
   direction, so that the branches have the lowest
   possible position numbers. (double bond get
   priority for lowest number)

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1. Write the prefix. (4-bromo-2-ethyl)
2. Write the root cyclo- plus the number of carbon
   atoms in the ring
3. Write the suffix name (-ane, ene, yne)
   (1-cyclohexene)

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4-bromo-2-ethyl-1-cyclohexene