Retained trivial names

Tablel.10 Retained Trivial Names of Alcohols and Phenols with Structures 1.24...

Monocyclic Aromatic Compounds. Except for six retained names, all monocyclic substituted aromatic hydrocarbons are named systematically as derivatives of benzene. Moreover, if the substituent introduced into a compound with a retained trivial name is identical with one already present in that compound, the compound is named as a derivative of benzene. These names are retained ... 

Where the IUPAC name for a compound is very different from a previously used recent trivial name, the latter is included as a synonym in parentheses (and in single quotes where no longer an acceptable name). Generally, retained trivial names have not been used as main entry titles, but they have been used occasionally in the entry texts. Rarely, on the grounds of brevity, names not conforming strictly to IUPAC principles but recommended for chemicals used in industry in BS 2474 1983 have been used. The prefix mixo-,to represent the mixtures of isomers sometimes used as industrial materials, is a case in point. 

Note that certain oxoanions still retain trivial names and these are listed in Table 4.1. Note also the exceptional use of hydro instead of the usual hydrido to represent the bound hydride ion. This is restricted to boron nomenclature and survives for historical reasons. 

In inorganic chemistry, certain substituent groups retain trivial names that are still in general use. 

S.4.2 Unsaturated and divalent substituents. Unsaturated monovalent substituents are named systematically by attaching the suffixes -yl to the stem of the parent name that carries the ending -ene or -yne. Retained trivial names include vinyl for -CH=CH2, allyl for -CH2-CH=CH2 and isopropenyl for -C(CH3)=CH2, but only when it is unsubstituted. 

A more complete list of retained trivial names is shown in Table 4.13. 

In some cases, however, we have retained trivial names (e.g., tri-thione, trithionium salt, isotrithione, and isotrithionium salt ) to which there are well-founded objections, but which are widely used and appear to cause no misunderstandings. 

Table 1. Retained trivial names for fused polycycles in ascending priority order (see also Section 6.3)...

Monocyclic hetero systems not having a retained trivial name can basically be named in two different ways. It should be kept in mind, however, that the principles according to which indexing and abstracting organisations opt for one or the other possibility are sometimes anything but obvious. 

Provided that no retained trivial name is applicable, fused heterocyclic systems are given Hantzsch-Widman names. Fusion of components follows the same pattern as established for corresponding hydrocarbons and an intricate series of seniority rules must be run through for selecting the parent component. Traditional abbreviated terms are retained for the following fusion components furo, imidazo, (iso)quino, pyrimido, thieno. 

Table 13. Retained trivial names for polynitrogen parent structures (In parentheses differing Chem. Abstr. names and numberings.)...

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