Registry number

In addition to the numeric data (color, solubility, refraction index, spectra, etc.), these factual databases also include a bibliographic section with references or sources and a section with information for the identification of a compound (e.g., name, CAS Registry Number, molecular weight). 

The CAS Registry contains information on all the chemical compounds published in the literature since 1957. The sources of these 21 million compounds are 9000 international journals containing chemical information. The database includes CAS Registry Numbers, the CAS name (not conforming to the lUPAC convention) with synonyms, and molecular and structural formulas. The CAS provides a weekly update (see Section 5.4). 

The problem of perception complete structures is related to the problem of their representation, for which the basic requirements are to represent as much as possible the functionality of the structure, to be unique, and to allow the restoration of the structure. Various approaches have been devised to this end. They comprise the use of molecular formulas, molecular weights, trade and/or trivial names, various line notations, registry numbers, constitutional diagrams 2D representations), atom coordinates (2D or 3D representations), topological indices, hash codes, and others (see Chapter 2). 

Nitrile CAS Registry Number Bp. °C Eree2ing pt, °C Iodine value... 

Material CAS Registry Number Mohs scale Ridgeway s scale WoodeU s scale Knoop hardness, kN/m " ... 

Stmcture CAS Registry Number Molecular formula bp, °c Pressure at bp,kPa"... 

THBA Product CAS Registry Number Time, h bp,°C Pressure at bp, kPa ... 

Compound CAS Registry Number Molecular formula Animal Oral LD q, g/ks Ref. 

Compound Molecular formula CAS Registry Number °C kPa Refractive index Density... 

Acrylate CAS Registry Number Molecular weight bp, glcirr Flash poiat. Water solubihty, g/100gH2O Heat of evaporatioa, Vi Specific heat, J/g-K ... 

Atomic number Element CAS Registry Number Symbol Atomic weight Discoverers and date of discovery... 

Ester CAS Registry Number Pressure, kPa Boiling point, °C... 

Common name Ring size, number of atoms Free aperture, nm Pore a Stmcture CAS Registry Number Formula... 

CAS Registry Number formula [75-69-4] CCI3F [75-71-8] cciy [76-14-2] CClFjCClFj [74-98-6] C3H3 [75-28-5] HC(CH3)3 [106-97-8] C4H10... 

Species CAS Registry Number T Dominant sink Sink location Reference... 

Compound CAS Registry Number Median concentration ppb C Reactivity with OH ... 

Substance CAS Registry Number Substance CAS Registry Number... 

Gas CAS Registry Number 1990 Concentrations Concentration increases, %/yr Greenhouse efficiency Atmospheric residence times, c yrs... 

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