1.2 Cyclic Systems
41
1.2.1.2.5
Cyclic Hydrocarbons with Side Chains
In principle, hydrocarbon systems comprising at the same time rings and
chains can be treated as ring systems substituted by chains or as chains
substituted by rings. Chemical intuition would certainly prefer a central
structure with as many substituents as possible and view a smaller unit as
substituent of a larger one; in 1972, however, Chern. Abstr. decreed categorically: rings always have priority over chains!
Et
0
11
~3
Me
1-Ethyl-3-methylbenzene
Triphenylmethane
Chern. Abstr.:
Methylidynetrisbenzene
1-Phenyl-2-( 4-tolyl) ethane
Chern. Abstr.: 1-Methyl-4(2-phenylethyl)benzene
1,2,3-Tri( cyclobutyl)propane
Chern. Abstr.:
Propane-1 ,2,3-triyltriscyclobutane
1,1,4,4-Tetraphenylbuta -1 ,3-diene
Chern. Abstr. since 1972:
Buta-1,3-diene-1,4-bisylidenetetrakisbenzene
A name conforming better with the
rules would be:
Buta -1 ,3-diene-1, 1 ,4,4-tetrayltetrakisbenzene