Chemical name Beilstein database

Four years later the first version of the system was complete. It was immediately integrated into the production scheme of the Beilstein Handbook and the Beilstein database. The Beilstein database was extended names generated by the system became a normal searchable data field in the Beilstein file offered by both DIALOG and STN information networks. Later, they also became fully searchable in the CD-ROM Current Facts information service, as well as in the biggest in-house chemical database system, CrossFire, which has been offered by Beilstein since 1994. 

While the Beilstein file contains a good deal of data in this area, there are also excellent compilations dedicated to thermodynamic quantities. DETHERM is produced by Dechema, and contains thermophysical properties for ca. 17000 compounds and mixtures (see Chemical Engineering Databases). The subject matter is taken from phase equilibria, PVT behavior, thermodynamic quantities, transport phenomena, surface properties, and electrolyte properties. Attention must also be drawn to the compilations of the US National Institute of Standards and Technology (NIST). The NIST Chemistry WebBook contains thermodynamic data for over 5000 compounds and ion energetics data for over 10000 compounds. The user may search on specific compounds based on name, chemical formula, or CAS Registry Number. Structures are given for all species, as well as common and commercial names. 

For the purpose of unambiguity in the selection of preferred names, the two most important producers and distributors of chemical information, i.e., CAS (see Chemical Abstracts Service Information System) and the Beilstein Institute (Beil-stein), devised nondocumented ad hoc sub-rules which only amplified the difficulty of uniquely naming organic compounds (see Factual Information Databases). These rules were necessary since lUPAC recommendations frequently allow more than one name for a given chemical compound. As a result, both institutions revised the lUPAC system and created their own systematic lUPAC-compatible rather than lUPAC-sanctioned nomenclatures. In addition, trivial or trade names, being shorter and more concise, have successfully replaced systematic names for a number of chemical compounds which are of commercial importance or are the subject of public concern, e.g., pharmaceuticals, insecticides, or pollutants. Both CAS and Beilstein claim to conform to the lUPAC rules and in general it is true. The lUPAC recommendations were consciously formulated to allow considerable freedom in... 

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