Chemical nomenclature updates

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. 

R. A. Y. Jones and J. F. Bunnett. Nomenclature for organic chemical transformations (lUPAC Recommendations 1989) , PureAppl. Chem. 61, 725-768 (1989). lUPAC. Compendium of Chemical Terminology, 2nd ed. (the Gold Book ). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version http //goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata updates compiled by A. Jenkins. 

Since its foundation in 1956 the Nomenclature Committee of the International Union of Biochemistry and Molecular Biology (NC-IUBMB) has continually revised and updated the list of enzymes. Entries for new enzymes have been added, others have been deleted completely, or transferred to another EC number in the original class or to different EC classes, catalyzing other types of chemical reactions. The old numbers have not been allotted to new enzymes instead the place has been left vacant or cross-references given to the changes in nomenclature. 

Nomenclature was then largely stable for organic compounds until 2006 further changes introduced are described in Section 3.2.2 and at appropriate places in the next chapter. Current CAS policy is described in the updated Naming and Indexing of Chemical Substances for Chemical Abstract, 2007 edition, available at cas.org. 

During most of 1788 Lavoisier wrote his masterpiece TraM Eldmentaire de Chimie and it was published in early 1789 (see Figure 211). The project had started as an attempt to provide an accessible introduction to chemistry, evolved to update the 1787 Mdthode de nomenclature chimique and became the most important treatise in the history of chemistry. It included the first modern list of chemical elements (33 in number, including the imponderables light and... 

Chemists prefer systematic names that precisely identify the chemical composition of chemical compounds. The system for inorganic nomenclature was devised by the International Union of Pure and Applied Chemistry (lUPAC), which was founded in 1921. The lUPAC meets regularly and constantly reviews and updates the system. 

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