2.2 Nomenclature Types for Substituted Systems
97
foregoing sections; the group names thus obtained can now directly be
employed to name factual free radicals. A couple of further examples may
illustrate this.
.
.
·CHz-CHz-CH -CHz-CH2 Pentane-l ,3,5-triyl
Propane-l-yl-3-ylidene (from an operational point
of view propane-l,1,3-triyl would certainly be the
better name!)
(C6H5)Si: Diphenylsilylene
(here again diphenylsilanediyl would
appear more appropriate)
Delocalized radicals can be named by way of their specific resonance
forms or with traditional summary group designations devoid of any
locants.
- O
~~2
, \
I
•
I
\
,
, -,
-
Phenylmethyl 5-Methylenecyclohexa-2,4-dien-l-yl
~
v~----------------~~
Prop-2-en-l-yl
Benzylradical
-
/~!-!,
H2C,' 0 -,CH2
Allyl radical
The names of oxygen radicals which are mostly derived from acids, alcohols, etc. are traditionally assiged the ending ... oxyl or, systematically, the
suffix ... oxidanyl. Radical names for other hetero groups can frequently be
adopted straightforwardly from the corresponding substituent prefixes.
For clarification they are usually supplemented by the descriptive term
"radical" .