Nomenclature of special compounds

          Unbranched assemblies consisting of two or more identical hydrocarbon units joined by a single bond are named by placing a suitable numerical prefix such as bi for two, ter for three, quater for four, quinque for five etc. before the name of the repititive hydrocarbon unit. Starting from both ends, the carbon molecules of each repititive hydrocarbon unit are numbered with unprimed and primed arabic numerals given as 1, 2, 3...., 1', 2', 3' ....., 1'', 2'', 3''..... etc. The points of attraction of the repititive hydrocarbon units are indicated by placing the appropriate locants before the value. As given,

         As an exception, unbranched assemblies consisting of benzene rings are named by using appropriate prefix with the name phenyl instead of benzene. As given,

         q If two atoms/groups of same preference occupy identical positions from either end of the parent chain, the lower number must be given to the atom/group whose prefix comes first in the alphabetical sequence. For example,

•  When two or more prefixes consist of identical words, the priority for citation is provided to that set which contains the lowest locant at the first point of difference. For example,

•    If a compound contains a benzene ring coupled to an alicyclic ring, it is called as a derivative of benzene, i.e. element having minimum state of hydrogenation. As given,

In the common system of nomenclature, prefixes iso and neo are used only for compounds containing an isopropyl group, (CH₃)₂CH and a tert-butyl group, (CH₃)₃C respectively at the end of the carbon chain.

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