1.1 IUPAC Naming Conventions

Question 1

5 steps of IUPAC naming:

Answer 1

1. identify the parent chain
2. number the parent chain
3. name the substituents
4. number the substituents
5. complete the name

Question 2

Rules for numbering the IUPAC parent chain:

Answer 2

always number the chain so that the highest-priority functional group has the lowest possible number

if all substituents have the same priority, number so that they have the lowest possible numbers

Question 3

Rules for choosing parent chain

Answer 3

most number of carbons

if tie: choose chain with MORE substituents

Question 4

How are numbers separated from each other and from words in a compound’s names?

Answer 4

numbers are separated by commas (no spaces)

numbers are separated from words within the compound by hyphens (-)

ex. 3,4-dipropryl-1,3-hexadien-5-yne

Question 5

How are substituents ordered in an IUPAC name?

Answer 5

alphabetical order

do NOT include hyphenated prefixes (di-, tri-, tetra-, n-, tert-) while alphabetizing

DO include non-hyphenated prefixes (iso-, neo-, cyclo-) while alphabetizing

Question 6

how is priority determined

Answer 6

the higher the atomic number, the higher the priority