Question

Question: Draw the structure corresponding to each IUPAC name.

a. (Z)-4-ethylhept-3-ene

b. (E)-3,5,6-trimethyloct-2-ene

c. (Z)-2-bromo-1-iodohex-1-ene

Short answer

Answer

Step-by-step solution

Detect the parent carbon chain

Determine the parent carbon chain from the parent name and assign groups as per the numbering.

Alkenes

Alkenes are numbered such that the double bonds get the lowest values, followed by the groups attached.

Drawing the structures of the given compounds

The alkyl groups are placed around the C=C bonds as per E and Z names.

a. The parent name “hept” indicates that the parent chain consists of seven carbon atoms. The Z isomer has the higher priority groups on the same side of C=C.

Structure of a

b. The parent name “oct” indicates that the parent chain consists of eight carbon atoms. The E isomer has higher priority groups on the opposite sides of C=C.

Structure of b

c. The parent name “hex” indicates that the parent chain consists of six carbon atoms. The Z isomer has higher priority groups on the same side of C=C.

Structure of c