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If there are multiple functional groups of the same type, either prefixed or suffixed, the position numbers are ordered numerically (thus ethane-1,2-diol, not ethane-2,1-diol.) The N position indicator for amines and amides comes before "1", e.g., CH 3 CH(CH 3)CH 2 NH(CH 3) is N,2-dimethylpropanamine.
If it applies but no heteroatom is found in a chain, it is preferred over multiplicative nomenclature. Example: 3-phospha-2,5,7-trisilaoctane refers to CH 3-SiH 2-PH-CH 2-SiH 2-CH 2-SiH 2-CH 3. Skeletal replacement mainly replaces carbon with other atoms, or in the case of phane nomenclature, whole "superatom" rings.
The IUPAC's rules for naming organic and inorganic compounds are contained in two publications, known as the Blue Book [1] [2] and the Red Book, [3] respectively. A third publication, known as the Green Book , [ 4 ] recommends the use of symbols for physical quantities (in association with the IUPAP ), while a fourth, the Gold Book , [ 5 ...
In the example, there is a bromo-substituted -CH 2-CH 2 - subunit. 1-Bromoethane-1,2-diyl is chosen in preference to 2- bromoethane-1,2-diyl as the former has a lower locant for the bromo-substituent. The preferred CRU is therefore oxy(1-bromoethane-1,2-diyl) and the polymer is thus named poly[oxy(1-bromoethane-1,2-diyl)].
That is, the name is not recognized according to the rules of any formal system of chemical nomenclature such as IUPAC inorganic or IUPAC organic nomenclature. A trivial name is not a formal name and is usually a common name. Generally, trivial names are not useful in describing the essential properties of the thing being named.
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If they are used at all, context should clarify (disambiguate) into the 1–18 numbering. Care should be taken when translating old sources that use this nomenclature to modern terminology. Some sets of groups have names: The main group elements are the elements of groups 1, 2, and 13–18 (i.e. the s-block and p-block). [5]
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