2.2 Nomenclature Types for Substituted Systems
101
EEl
CHs Methanium
Propan-2-ium
Nonclassical cations derived from other saturated element hydrides can
be named in like manner.
EEl
.
BH4 Boramum
NH~EEl Azanediium or Azanebis(ium)
d) If cations are formally produced by removal of an electron from a radical position or by way of detachment of a hydride (protide, see p. 183)
ion from a parent hydride, this is indicated by the composite name ending ... ylium. Once again naming modes such as ... yl cation have more
descriptive character. The traditional class name for such species is carbenium ions.
H3C-CH~ Ethylium
Ethyl cation C
C±) Cyclopent-3-ene-l,I'-bis(ylium)
I C 2 Cyclopent -3-enylidene dication
H
Cyclobutyl~CH2C±) methylium
VCyclobutylmethyl
cation
EEl
Benzoylium
Benzoyl cation
(Oxophenylmethylium)
H3C-S02 Methanesulfonylium; methanesulfonyl cation
Fully systematic: Methyldi( oxo )-A 6 -sulfanylium
SiC±) Trimesitylsilylium
Trimesitylsilyl cation
a,a-Dimethylbenzyloxidanylium
(traditional name: ... benzyloxenium)
2-Methylpropan -2-ylium -1-ium