Organic ring index, Chemical Abstracts

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... 

The name phenothiazine and the numbering given in the Revised Ring Index, used in Chemical Abstracts, and recommended by the lUPAC Rules of Organic Nomenclature will be used throughout this chapter. The o- andp-quinonoid forms of phenothiazine,... 

For the organic chemist, knowledge of, and access to, the more familiar components of the printed products of Chemical Abstracts is still desirable CA abstracts CA Volume Indexes and CA Collective Indexes CA Index Gnide CAS Source Index (CASSI) Registry Handbook Number Section the Ring Systems Handbook and CA Selects. 

Highlights in American chemical nomenclature activity have been (1) the adoption in 1915 of systematic naming, with inverted organic entries, for the indexing of chemical compounds by Chemical Abstracts, (2) the publication in 1940 of The Ring Index by Austin M. Patterson and Leonard T. Capell (this activity was sponsored jointly by the National Research Council and the American Chemical Society), and (3) the publication in 1945 by Chemical Abstracts of The Naming and Indexing of Chemical Compounds by Chemical Abstracts. The last two are very useful publications. 

BRCT = Beilstein Registry Connection Table BRN = Beilstein Registry Number CAS = Chemical Abstracts Service CNOC = Commission on the Nomenclature of Organic Chemistry CT = connection table ICRS = Index Chemicus Registry System ISI = Institute for Scientific Information RN = CAS Registry Number SCN = Structure Code Number SSSR = smallest set of smallest rings WLN = Wiswesser Line-formula Notation. 

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