Nomenclature INDEX

Fisanick, W., L. D. Mitchell, J. A. Scott, and G. G. Vander Stouw, "Substructure Searching of Computer-Readable Chemical Abstracts Service Ninth Collective Index Nomenclature Files," Journal of Chemical Information and Computer Sciences, lj>(2), 73-84 (1975). 

Although this procedure for replacement names is recommended in the Chemical Abstracts Ninth Collective Index Nomenclature Manual, the Index Guide now employs a more complicated system. 

Although all alkaloids can be named by the principles already outlined in this article, the cumbersome nature of such names for complex ring systems makes it desirable to use trivial parent names for some large heterocyclic skeletons. It is preferable for such trivial names to refer to skeletons with no substituents (or very few), and it is often convenient for them to carry inherent stereochemical implications. The most extensive source of these names is the Chemical Abstracts Index Guide (or the Ninth Collective Index Nomenclature Manual), but the names given here do not correspond, in many cases, to those in common use, and IUPAC recommendations, when they appear, may well differ in some respects. Some of the principal skeletons listed by Chemical Abstracts are illustrated (122-130). 

As 1,4 3,6-dianhydrohexitols are bicyclic systems, the appropriate ring-index nomenclature may also be used. The numbering of the atoms in such names differs from that used in the sugar-derived names. Furthermore, the stereochemistry for each of the anomeric centers has to be separately defined. The compounds under discussion have a 2,6-dioxabicylo[3.3.0]oc-tane framework, shown in Formula 6, and incorporates hydroxyl groups on C-4 and C-8. 

For hexagonal crystal planes, a slightly different indexing nomenclature is used relative to cubic crystals. To index a plane in the hexagonal system, four axes are used, called Miller-Bravais indices. In addition to both a and b axes, another axis... 

Others arise from the use of the registry system to support the preparation of index nomenclature. Thus, all parent ring systems are registered even when the parent compound has not been made. Also, all components of addition compounds, mixmres, or copolymers are registered and, occasionally, one of these components may not have been reported in the literamre. 

G.G. Vander Stouw, C. Gasta m, J.D. Rule and C.E. Watson, The Chemical Abstracts Service Chemical R stry System. IV. Use of the Re stry System to Support the Preparation of Index Nomenclature, J. Chem. Inf. Comput. Sci. 16 (1976), 213-8. 

Index (Nomenclature in English) Vocabulary German - English... 

The alphabetical index (nomenclature in English) at the end of the book was prepared by Mr. Friedrich Derz. 

Flsanlck, W., Mitchell, L. D., Scott, J.A., and Vanderstouw, G. G., "Substructure Searching of Computer-Readable Chonlcal Abstracts Service Ninth Collective Index Nomenclature Files", J. Chem. Inf. Comput. Sci., 13 (2)... 

Dunn, R. G., Fisanlck, W., and Zamora, A., "A Chemical Substructure Search System Based on Chemical Abstracts Index Nomenclature", J. Chem. Inf. Computer. Sci., ]J (4),... 

The systematic lUPAC nomenclature of compounds tries to characterize compounds by a unique name. The names are quite often not as compact as the trivial names, which are short and simple to memorize. In fact, the lUPAC name can be quite long and cumbersome. This is one reason why trivial names are still heavily used today. The basic aim of the lUPAC nomenclature is to describe particular parts of the structure (fi agments) in a systematic manner, with special expressions from a vocabulary of terms. Therefore, the systematic nomenclature can be, and is, used in database systems such as the Chemical Abstracts Service (see Section 5.4) as index for chemical structures. However, this notation does not directly allow the extraction of additional information about the molecule, such as bond orders or molecular weight. 

The lUPAC rules are not the only nomenclature system in use today Chemical Abstracts Service sur veys all the worlds leading scientific journals that publish papers relating to chemistry and publishes brief abstracts of those papers The publication Chemical Abstracts and its indexes are absolutely es sential to the practice of chemistry For many years Chemical Abstracts nomenclature was very similar to lUPAC nomenclature but the tremendous explosion of chemical knowledge has required Chemical Abstracts to modify Its nomenclature so that its indexes are better adapted to computerized searching This means that whenever feasible a compound has a sin gle Chemical Abstracts name Unfortunately this Chemical Abstracts name may be different from any of the several lUPAC names In general it is easier to make the mental connection between a chemical structure and its lUPAC name than its Chemical Abstracts name... 

Quite naturally there is a certain amount of arbitrariness in this system, although the lUPAC nomenclature is followed. The preferred Chemical Abstracts index names for chemical substances have been, with very few exceptions, continued unchanged (since 1972) as set forth in the Ninth Collective Index Guide and in a journal article. Any revisions appear in the updated Index Guide new editions appear at 18-month intervals. Appendix VI is of particular interest to chemists. Reprints of the Appendix may be purchased from Chemical Abstracts Service, Marketing Division, P.O. Box 3012, Columbus, Ohio 43210. 

Several systems of nomenclature have been used for naphthalene, and many trivial and trade names are well estabUshed. The Chemicaly hstracts Index Guide is employed in this article. The numbering of the naphthalene nucleus is shown in (1) older practices are given in (2) and (3). 

In 1967, the Polymer Nomenclature Committee of the American Chemical Society pubHshed proposals for naming linear polymers on the basis of their chemical stmcture (97), which were then introduced into Chemical Abstracts (CA) Indexes and pubHshed in their final form in 1968 (98). 

Naming and Indexing of Chemical Substances for Chemical Abstracts, Chemical Abstracts Service, American Chemical Society, Washington, D.C., 1992. Nomenclature of Organic Chemist, lUPAC, Pergamon Press, New York, 1979. 

Eor the many details of constmcting or interpreting stmctures and systematic names, the Hterature on nomenclature and indexing (6) can be consulted. Systematic nomenclature is illustrated by the Chemicaly hstracts name of the sodium iron(III) EHPG chelate sodium [[N,N -l,2-ethanediylbis[2-(2-hydroxyphenyl)glyciQatol]](4-)-N,N, 0,0, 0, 0 ]ferrate(l-) [16455-61-1], The ferrate anion (12) [20250-28-6] and the potassium salt [22569-56-8] are also Hsted ia Chemical Abstracts (7). 

Ruthless adherence to full systematic nomenclature throughout these volumes would serve little useful purpose. While it is necessary for the Chemical Abstracts indexes to avoid colloquial forms, most of our contributors seem to agree that insistence on the use of, e.g. 4(17f)-pyridinone at every point, rather than the traditional but less precise 4-pyridone , produces a pedantic effect on the English style. So old-fashioned forms like pyridone coexist here with systematic names, the choice being dictated by the individual authors of the chapters. 

The fusion name l//-triazolo[4,5-d]pyrimidine for (140) is preferred by practitioners in the field and appears in CA indexes. On the other hand, the nonspecialist, who may well be uncertain about his command of fusion nomenclature, might more easily grasp the replacement name l//-l,2,3,4,6-pentaazaindene. (This is an appropriate place to emphasize that, by lUPAC rules, replacement names are to be based only on a completely carbocyclic parent. Notwithstanding the attractive simplicity of 8-azapurine for the example at hand, it has no sanction see, however. Section 1.02.3.2. The purpose of this avoidance is to forestall a multiplicity of names for systems containing several hetero atoms.)... 

Chenlcal Abstracts Nomenclature (Collective Index Humber) ... 

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