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Find Properties of your Chemical
Along with SciFinder and Reaxys, here are some other good "starting place" databases to find basic information about chemical compounds: molecular weight, CAS Registry numbers and common physical property data. However, they are not as useful if you need physical properties beyond the basics, or information on the synthesis or preparation.
Basic property data and key literature references for 11,500 significant chemical compounds. From here, you can also link over to your compound's record in ChemSpider to find more property data.
Combined Chemical Dictionary
Core data (including derivatives) for 540K compounds, including organic compounds and natural products. Includes Dictionary of Organic Compounds, Dictionary of Natural Products, Dictionary of Drugs, and Dictionary of Inorganic and Organometallic Compounds.
Chemical information database for 29+ million substances and 45+ million reactions. An essential complement to SciFinder for substance and reaction searching. Searchable by chemical names, numbers, structures, and by topic/keyword. Extensive source for physical property database, indexing 500 property fields, and each data point includes a journal article or patent reference.
Extensive collection of searchable property data extracted from textbooks, handbooks, encyclopedias and databases. You can search by compound and property (heat capacity AND ammonium chloride). Some titles have interactive features like an equation plotter.
Properties of Organic Compounds
Property data and numerical MS, UV and IR peaks for 29,000 organic compounds, with references to the handbooks where the spectra can be located. Does not include the actual spectra.
A (free) chemical structure database of over 60 million chemical structures. Search to find property data and spectra, with sources included. Data extracted from other sources, including companies and government agencies, as well as deposited data from registered users.