IUPAC NAMING
Review
STRUCTURAL FORMULA
• STRUCTURAL FORMULA - is a two-dimensional structural
representation that shows how the various atoms in a
molecule are bonded to each other.
Condensed Structural Formula- is a structural formula that
uses groupings of atoms, in which central atoms and the
atoms connected to them are written as a group, to convey
molecular structural information.
Expanded Structural Formula - is a structural formula that
shows all atoms in a molecule and all bonds connecting the
atoms.
IUPAC Nomenclature
• Pronounced as EYE-YOU-PACK
• IUPAC stands for INTERNATIONAL
UNION OF PURE AND APPLIED
CHEMISTRY
The advantage of the IUPAC naming system
is that it assigns each compound a name
that not only identifies it but also enables
one to draw its structural formula.
THINGS TO REMEMBER…
•Identify the continuous alkanes
(Parent Chain).
Note that all of these names ends with “ane”
•Identify the Substituents (BranchedChain Alkyl)
Note that all of these names ends with “yl”
IUPAC PREFIX
1. METH 2. ETH
3. PROP 4. BUT
5. PENTA
IUPAC
PREFIXES
6. HEXA
7. HEPTA 8. OCTA
9. NONA 10. DECA
IUPAC RULES
Rule 1:
Identify the longest continuous carbon chain (the
parent chain), which may or may not be shown in a
straight line, and name the chain.
Rule 2:
Identify the substituent.
Rule 3:
Number the carbon atoms in the parent chain from
the end of the chain nearest a substituent (alkyl
group).
IUPAC RULES
Rule 4:
If only one alkyl group is present, name and
locate it (by number), and prefix the number and
name to that of the parent carbon chain.
Rule 5:
If two or more of the same kind of alkyl group are
present in a molecule, indicate the number with a
Greek numerical prefix (di-, tri-, tetra-, penta-,
and so forth). In addition, a number specifying
the location of each identical group must be
included. These position numbers, separated by
commas, precede the numerical prefix. Numbers
are separated from words by hyphens.
IUPAC RULES
Rule 6:
When two kinds of alkyl groups are present on the
same carbon chain, number each group separately,
and list the names of the alkyl groups in alphabetical
order.
Rule 7:
Follow IUPAC punctuation rules, which include the
following: (1) Separate numbers from each other by
commas. (2)Separate numbers from letters by
hyphens. (3) Do not add a hyphen or a space
between the last-named substituent and the name of
the parent alkane that follows.
ACTIVITY
THANK YOU…