Cyclic Hydrocarbons

Cyclic Hydrocarbons

Examples Testosterone

Hydrocarbon ring structures. • When two ends of a hydrocarbon chain join together

Naming and Drawing Cyclic hydrocarbons • Draw the ring, according to the root of the name. • Choose one of the ring carbon atoms as carbon number 1. Place each branch accordingly.

Draw a condensed structural diagram for 1, 2, 4-trimethylcycloheptane • Draw the ring, according to the root of the name.

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

Naming Cyclic Hydrocarbons • Identify the branches. • Number the carbons in the ring, in either direction, so that the branches have the lowest possible position numbers. • Write the prefix. • Write the root –cyclo- plus the number of carbon atoms in the ring • Write the suffix name (-ane, ene, yne)

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)

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

3-ethyl-1,1-dimethyl cyclohexane

Name this compound • Identify the branches. (in red) • 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)

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

4-bromo-2-ethyl-1-cyclohexene

Cyclic Hydrocarbons