Preferred IUPAC Names
Chapter 1, September, 2004
25
m
en
da
tio
ns
Table 1.4 Basic numerical terms (multiplying prefixes)
Numerical
Term
Number
Numerical
Term
Number
Numerical
Term
Number
Numerical
Term
1
mono, hen
11
hendeca
101
henhecta
1001
henkilia
2
di, do
20
icosa
200
dicta-
2000
dilia
3
tri
30
triaconta
300
tricta-
3000
trilia
4
tetra
40
tetraconta
400
tetracta
4000
tetralia
5
penta
50
pentaconta
500
pentacta
5000
pentalia
6
hexa
60
hexaconta
600
hexacta
6000
hexalia
7
hepta
70
heptaconta
700
heptacta
7000
heptalia
8
octa
80
octaconta
800
octacta
8000
octalia
9
nona
90
nonaconta
900
nonacta
9000
nonalia
10
deca
100
co
Re
P-14.2.1.1 The prefix mono
m
Number
hecta
9000
nonalia
on
al
P-14.2.1.1.1 When alone, the numerical term for the number 1 is mono and that for 2 is di. In
association with other numerical terms, the number 1 is represented by hen (except in the case of
undeca) and the number 2 by do (except in the cases of dicta and dilia). The numerical term for
the number 11 is undeca.
Pr
ov
isi
P-14.2.1.1.2 The prefix mono is not used in systematically formed names to indicate the
presence of one nomenclatural feature, for example suffixes, prefixes, endings. It is used in functional
class nomenclature to designate a monoester of a diacid, for example phthalic acid monomethyl ester,
and in terminology, to emphazise singleness, for example, monocyclic and mononuclear in contrast to
bicyclic and polynuclear.
P-14.2.1.2 Derivation of basic numerical terms
PA
C
After undeca- (number eleven), composite numerical terms are formed systematically by citing
the basic terms in the order opposite to that of the constituent digits in the arabic numbers. The
composite terms are formed by direct joining of the basic terms, without hyphen(s). The letter i in
icosa is elided after a vowel.
IU
Examples:
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