1. IUPAC (International Union of Pure and Applied Chemistry) nomenclature provides systematic names for organic compounds that unambiguously describe their structure. 2. The IUPAC name includes the parent name for the longest carbon chain, prefixes to describe any substituents, and suffixes to indicate functional groups. 3. Examples of IUPAC names are 3-ethyl-2-methylhexane, 1-methylcyclohexene, 3-chlorocyclopentanone, 2-heptene, and 2-hexanol.

2. H2 H2 H2
C C C
H 3C C C C H3
H2 H2
C H3
H2
CH C
H 3C CH C H3
C H3
H2
C
H 2C C H2
H 2C C H2
C
H2

3. aromatic compounds
•
• -
• - n+ n
, , …)
-
-
- 6 10 14 14

5. Functional group
•
CH3OH -OH
• 2
–
–
• CH 3 CH 2 CH - OH Na
-
CH 3 O Na
1
H2
2
2

6. 1.
. C–C RC – CR’ H3C – CH3
R CH 3
. >C=C< RC = CR’ H2C = CH2
. –C C– R–C C HC CH
– R’
.
2. – X ( X = Cl, R’ – X CH3 – Cl
Br , I, )
3. – OH R – OH CH3 – CH2 –

7. 4
O O O
6. C H R C H HC H
O O O
7. C R' C R' CH C CH
3 3
O O O
8. R C OH CH C
3 OH
C OH
O O O
C NH R C NH2 CH C NH
3 2
9. 2
O O O
C O R C O
R CH C O 3
3 CH
10.

8. 2
1. (common name)
2. IUPAC (International Union of
Pure and Applied Chemistry)

10. IUPAC
5 IUPAC
3
1 (basic
unit parent name)
2 (suffix)
3 (prefix)
prefix + basic unit (parent name) + suffix

11. IUPAC
• (basic unit)
C C
1 C meth-
2 C-C eth-
3 C-C-C prop-
4 C-C-C-C but-
5 C-C-C-C-C pent-
6 C-C-C-C-C-C hex-
7 C-C-C-C-C-C-C hept-
8 C-C-C-C-C-C-C-C oct-
9 C-C-C-C-C-C-C-C-C non-
10 C-C-C-C-C-C-C-C-C-C dec-

12. suffix
–e
–ol,
-one

13. substitute group
• alkyl
R
• –ane
–yl Cl- chloro
Br- bromo
CH − CH −CH − CH −CH −CH − nitro
NO2-
HO- hydroxy
methyl ethyl n-propyl CH3O- methoxy
CH2=CH- vinyl
CH −CH(CH )− CH −CH −CH −CH − 2- allyl
CH2=CH-CH
isopropyl n-butyl
phenyl aryl
R

14. prefix
•
C
1. C
OH OH
H 3C CH 2 CH 2 CH CH 3 H 3C CH 2 CH 2 CH CH 3
1 2 3 4 5 5 4 3 2 1
• 2.
H 3C CH 2 CH CH CH 3 H 3C CH 2 CH CH CH 3
1 2 3 4 5 5 4 3 2 1
2 3 4

15. 5.2
3.
IUPAC
di = 2 , tri = 3 ,
tetra = 4 , penta = 5
4.
CH 2 CH 3
CH 3 CH 2 CH 2 CH CH CH 3
CH 3
6 5 4 3 2 1
1 2 3 4 5 6
• 3-ethyl-2-methylhexane ethyl C
3 methyl group C 2
hexane

16. • cyclo 1
O
C H3
cyclobutane
Cl 1-methylcyclohexene
3-chlorocyclopentanone

17. 2-heptene
2-hexanol
3-methyl-2-pentanol
5-ethyl-3-octanone

18. 5.2 IUPAC
3-ethyloctane
6-methyl-3-octene
4-ethyl-2-methyl-1-hexanol
or
4-ethyl-2-methylhexanol
OH
NH 2
2,3-dimethyl-pentanamide
O