Subject indexes, Chemical Abstracts

CAS Registry Number Index Author Index General Subject Index Patent Index Formula Index Compound Index Chemical Abstract Number Index Organisation Journal Title Index Language Index Year of Publication Index Document Type Index... 

The print edition of Chemical Abstracts appeared in weekly issues. Six months of these issues constituted a volume that was accompanied hy six indexes General Subject Index, Chemical Substance Index, Formula Index, Index of Ring Systems, Author Index, and Patent Index [12], January to June of 1993 was volume 118. Ten volumes (5 years coverage) were combined in the Collective Indexes, the 11th collective volumes covered the years from 1982 to 1986 and comprised 93 hound hooks occupying 17 feet of shelf space. It is easy to see why the print version is no longer published. 

Chemical Abstracts. These were commenced by the American Chemical Society in 1907. The abstracts are very comprehensive (particularly in recent years) from the standpoint of subject matter and journals covered. Four decennial indexes have appeared—1917, 1927, 1937 and 1947—and these are widely used for locating information pub lished during the period 1907-1947. The annual indexes cover the period 1948 to date. 

For more comprehensive lists, see the various lists of radicals given in the subject indexes of the annual and decennial indexes o/Chemical Abstracts. 

Preparations appear in the alphabetical order of common names of the compounds. Eor convenience in surveying the literature concerning any preparation through Chemical Abstracts subject indexes, the Chemical Abstracts indexing name for each compound is given as a subtitle if it differs from the common name used as the title. 

According to the triazine nomenclature, 5-azauracil is 2,4-dioxo-l,2,3,4-tetrahydro-l,3,5-triazine (2). The subject index of Chemical Abstracts prefers s-triazine-2,4(lH,3H)-dione. Furthermore, some authors use a name derived from the lactim structure, 2,4-dihydroxy-s-triazine (3). The numbering of the substituents is the same for all these types of nomenclature. 

This review includes most of the published articles from the defined area and excludes only imidazoquinolines, which were reviewed in Weissberger-Taylor s series The Chemistry of Heterocyclic Compounds (81MI1). Comprehensive Heterocyclic Chemistry II (96MI1) mentioned only some of the azoloquinolines in the first edition the authors omitted citations about this type of compounds. The trend toward interest in these compounds can be illustrated by the number of citations in Chemical Abstract as shown in Table I. Besides Chemical Abstracts Substance/Subject (Collective) Indexes, the MDL database search has been used. 

Compounds of the form RN2 X are named by adding the suffix -diazonium to the name of the parent compound RH, the whole being followed by the name of X- (Rule C-931.1, e.g., methanediazonium tetrafluoroborate, benzenediazonium chloride, not phenyldiazonium). Following RC- 82.2.2.3 (IUPAC, 1993), diazonium ions may also be named structurally on the basis of the parent cation diazenylium HNJ, e.g., benzenediazenylium ion. We name the substituent — NJ diazonio (not diazonium) following the same rule. Diazonio describes both mesomeric structures — N = N and — N = N. If one wants to describe one of these structures only, diazyn-l-ium-l-yl or diazen-2-ylium-l-yl has to be used for -N = N or -N = N, respectively. In the General Subject Index of Chemical Abstracts and in Beilstein, diazonium compounds as a class are indexed under this heading. 

The index consists of two parts. Part I contains entries referring to the conventional names of compounds as they appear in the preparations of this volume followed by the systematic names in brackets, if the nomenclature differs The bracketed names conform to the systematic nomenclature adopted by the Chemical Abstracts Service starting with Chemical Abstracts Volume 76 (1972) Part II of the index contains entries of the subjects of this volume with compound names in a reversed order of Part I... 

The primary chemical literature has been surveyed up to the end of 1990. Chemical Abstracts subject and chemical substance indexes have been searched up to and including Volume 110. References appeared in Volumes 111 and 112 and a few more references from the later literature have been added to the Appendix (Chapter 7, Section D). 

In preparing this article, the primary chemical literature through July of 1996 was surveyed. Chemical Abstracts Subject and Chemical Substance Indexes through and including Volume 124 were searched. Throughout this article, the name and numbering style favored by Chemical Abstracts is used, and this style is indicated on Schemes 1-3. 

This review covers the literature in primary journals to early 1981 and in Chemical Abstract Subject Indexes to Volume 94. The names used are those adopted by Chemical Abstracts, and the numbering system is [1,2,3) etc. for triazoles rather than the v- or s- symbols. 

---