Beilstein Formula index system

Although the Hill system is now used almost exclusively, other systems have been used in the past. For example, the early formula indexes to Beilstein used the Richter system, in which the elements are cited in the order C, H, O, N, Cl, Br, I, F, S, R... 

The most useful of these is Beilstein s Handbuch der organische Chemie, which lists the methods of preparation, the reactions, and the properties of all organic compounds which were reprorted in the years that are covered. The main series covers the literature up to 1909, the first supplement covers 1910—1919, and the second supplement covers 1920—1929. A third supplement, which has begun to appear, covers 1930—1949. There is a system which determines where a given compound win appear in the series, but with the advent of subject and formula indexes, there is no longer a need to become familiar with this system. 

The Hill system is used in modified form today by Chemical Abstracts and Referativny Zhurnal, Khimiya (17) and indexes both inorganic and organic compounds. Beilsteins Handbuch (2) formula index to the second supplement uses the Hill system. This index covers the original work and two supplements. 

Certain modifications of the Richter system have been made in Stelzner (21), Beilstein, and Chemisches Zentralblatt (Table I). Unless otherwise stated, the following rules apply to all three formula indexes. Corresponding entries are given for Chemical Abstracts. 

Volumes 28 and 29 of the Second Supplement are, respectively, the subject and formula indexes to the entire "Beilsteins Handbuch the three-part cumulative formula index, arranged by the Hill system, is the only index recording the known formulas of organic compounds from the beginnings of organic chemistry through 1929. (The Chemical Abstracts cumulative formula index extends this period to 1946.)... 

Find the following compounds in the formula index for the Second Supplement of Beilstein (see Section 29.10). (1) List the page numbers from the main work and the supplements (first and second). (2) LFsing these page numbers, look up the system number (Syst. No.) and the main work number Hauptwerk number, H) for each compound in the main work and the first and second supplements. In some cases, a compound may not be found in all three places. (3) Now use the system number and main work number to find each of these compounds in the third and fourth supplements. List the page numbers where these compounds are found. 

Vol. 19. General subject index and group index Vol. 20. General formula index Series 1 and II (volumes 1-11) were never published. Volume 12 was issued in two parts, 12A Bicyclic compounds, and 12B Naphthalene, in nine volumes (1948-1955). Volume 13 was published in 1946 and volume 14 in 1940 to which six supplements were added 1951-1962. Supplements 5 and 6 were issued under the auspices of the Beilstein Institute who took over the encyclopaedia in 1954 and combined it with the current supplement to Beilstein. The system of arrangement of Elsevier depends on the structure of the compound and brings together those that are most closely related. Occurrence in nature and in technical products is discussed followed by syntheses from systems with fewer carbon atoms and formation by the degradation of more complicated systems. 

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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