IUPAC nomenclature revision

IUPAC Nomenclature of Organic Chemistry, Section F, revised version in preparation. 

Quite naturally there is a certain amount of arbitrariness in this system, although the IUPAC 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. 

PACI995 IUPAC Nomenclature of Organic Chemistry Revision of the Extended... 

IUPAC nomenclature (Section 2.11) The most widely used method of naming organic compounds. It uses a set of rules proposed and periodically revised by the International Union of Pure and Applied Chemistry. 

In this book we use the Nomenclature of Organic Chemistry of the International Union of Pure and Applied Chemistry, 1979 Edition ( Blue book , IUPAC, 1979), the Revised Nomenclature for Radicals, Ions, Radical Ions, and Related Species (IUPAC, 1993), and additional rules applied by the Chemical Abstracts Service for the 1987-1991 Index Guide Chemical Abstracts, 1992). 

IUPAC (1993) Nomenclature of Organic Chemistry. Revised Nomenclature, Ions, Radical Ions, and Related Species, Pure Appl. Chem. 65, 1357 [1.2]. 

Not all problems were solved, however, and different usages were encountered on the two sides of the Atlantic. A joint British-American committee was therefore set up, and in 1952 it published Rules for Carbohydrate Nomenclature [18]. This work was continued, and a revised version was endorsed in 1963 by the American Chemical Society and by the Chemical Society in Britain and published [19]. The publication of this report led the IUPAC Commission on Nomenclature of Organic Chemistry to consider the preparation of a set of IUPAC Rules for Carbohydrate Nomenclature. This was done jointly with the IUPAC-IUB Commission on Biochemical Nomenclature, and resulted in the Tentative Rules for Carbohydrate Nomenclature, Part I, 1969 , published in 1971/72 in several journals [1]. It is a revision of this 1971 document that is presented here. In the present document, recommendations are designated 2-Carb-n, to distinguish them from the Carb-n recommendations in the previous publication. 

IUPAC Commission on Nomenclature of Organic Chemistry, Revised nomenclature for radicals, ions, radical ions and related species (Recommendations 1993), PureAppL Chem., 65, 1357-1455 (1993). 

IUPAC Commission on Nomenclature of Organic Chemistry, Revision of the extended Hantzsch-Widman system of nomenclature for heteromonocycles, Pure Appl. Chem., 55, 409-416 (1983). 

Since the early 1970s a panel convened by the International Union of Pure and Applied Chemistry and the International Union of Biochemistry and Molecular Biology has been working to formulate recommendations for carbohydrate nomenclature that meet developing needs of research and electronic data handling, while retaining links to the established literature base on carbohydrates. The realization of these endeavors is presented here in the final document Nomenclature of Carbohydrates, which provides a definitive reference for current researchers, both in the text version and in the version accessible on the World Wide Web (http //www.chem.qmw.ac.uk/iupac/2carb/), where amendments and revisions are maintained. 

The first seven-coordinate phosphorus compound, 12, containing a spiro phosphorus atom has recently been reported <2000IC1338>. The IUPAC recommendations for the nomenclature of spiro compounds was revised and extended in 1999 <1999PAC531>. 

The nomenclature of boron compounds involves some intricacies. IUPAC rules allow the terms borabenzene or borinine for 2 the older name borin has become obsolete with the recent revision of the extended Hantzsch-Widman system (6). Anions 4 are termed boratabenzene ions an alternative would be borininate instead of the earlier borinate (7). 

Descriptive properties for a basic group of approximately 1400 inorganic compounds are compiled in Section 3. These follow a concise, revised introduction to inorganic nomenclature that follows the recommendations of the IUPAC published in 1990. In this section are given the exact atomic (or formula) weight of the elements accompanied, when available, by the uncertainty in the final figure given in parentheses. 

At one time thiols were named mercaptans. Thus, CH3CH2SH was called ethyl mercaptan according to this system. This nomenclature was abandoned beginning with the 1965 revision of the IUPAC rules but is still sometimes encountered. When one encounters a thiol for the first time, especially a low-molecular-weight thiol, its most obvious property is its foul odor. Ethanethiol is added to natural gas so that leaks can be detected without special equipment—your nose is so sensitive that it can detect less than one part of ethanethiol in 10,000,000,000 parts of air The odor of thiols weakens... 

The principal advances in the systematization of organic nomenclature have come from the International Union of Pure and Applied Chemistry (IUPAC) Commission on the Nomenclature of Organic Chemistry, and from the Chemical Abstracts Service. The IUPAC Definitive Rules for Hydrocarbons and Heterocyclic Systems (1957)4 and for Characteristic Groups (1965)5 have been widely accepted by the chemical community, and, in their latest revised form,6 constitute the standard reference work. These rules are closely related to those developed in parallel by Chemical Abstracts for indexing purposes, and it is fortunate that, as a result of close cooperation between the two bodies, there are few areas of disagreement. 

The IUPAC Commission on Nomenclature of Organic Chemistry has continuing responsibility for revising and expanding the rules that appeared in the Definitive Report. 

IUPAC Commissions, and with persons outside IUPAC during the period 1970-1975. Among the latter, special mention must be made to Professors M. Boudart (USA), J. B. Butt (USA), and F. S. Stone (UK). A tentative version of these proposals was issued as Appendix 39 (August 1974) on Tentative Nomenclature, Symbols, Units and Standards to IUPAC Information Bulletin. The text has been revised in the light of the criticisms, comments, and suggestions which were received, and the present version was prepared by the Commission and formally adopted by the IUPAC Council at its meeting in Madrid, Spain, in September 1975. 

From the different suggested numberings of the phenoxazine nucleus, at present only two systems, 1 and 2, are widely used. Throughout this paper the numbering system 1 has been adopted as being the most frequent today, and also approved in the Revised Ring Index (no. 3290),5 used in Chemical Abstracts and recommended by the IUPAC Rules of Organic Nomenclature. 6... 

Two chapters of Red Book I have been shortened or subsumed since in both areas extensive revision is still necessary. First, the chapter on Solids (IR-11) now describes only basic topics, more recent developments in this area tending to be covered by publications from the International Union of Crystallography (IUCr). It is to be hoped that future cooperation between IUPAC and IUCr will lead to the additional nomenclature required for the rapidly expanding held of solid-state chemistry. 

First, commercial and common (or trivial) names for a host of organic molecules abound, and these will be used parenthetically where appropriate here so that you might come to recognize them. However, the preferred system of nomenclature is the definitive set of rules adopted by the International Union of Pure and Applied Chemistry (lUPAC rules to be found on the Internet at http //www.chem.qmul.ac.uk/ iupac/iupac.html see Appendix II). While the set is occasionally revised (last in 1979), most of what you learn will remain applicable. 

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