Nomenclature

Question 1

Rule 1: parent chain

Answer 1

Find longest parent carbon chain

–if there is a tie, the one with the most substituents is the parent chain

Question 2

Rule 2: numbering

Answer 2

The terminal carbon closest to a substituent is numbered #1

-if there is a tie, look at the second substituent

Question 3

Rule 3: alphabetizing and numbering substituents

Answer 3

Order the substituents alphabetically and give each one a number to match the carbon to which it is attached

Question 4

Rule 4: prefixes (when and why they are necessary)

Answer 4

If more than one of the same substituent is present, use the prefixes di, tri, tetra, etc
–e.g., 2,2-dimethylbutane

Question 5

Rule 5: when to use hyphens

Answer 5

Hyphens are places before and after substituent numbers, but not between standard prefixes

Question 6

Rule 6: alphabetizing

• -Do NOT consider the prefix when alphabetizing the substituents if:
• -DO alphabetize if:

Answer 6

1. it represents a number (di-, tri-, etc.)
2. it includes a hyphen (sex-, tert-, etc.)
3. alphabetize other prefixes, like isopropyl, isobutyl, etc.