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Preparation and Reaction Databases
SciFinder's CASREACT database and Reaxys should be your first choices, but there are free online sources that you might also consider.
Spectral Database for Organic Compounds : SDBS
SDBS integrated spectral database includes electron impact Mass (EI-MS), Fourier transform infrared (FT-IR), 1H nuclear magnetic resonance (NMR), 13C NMR, laser Raman, and an electron spin resonance (ESR) spectra.
SciFinder provides direct links to spectra data.
See also: Associations Unlimited for over 22,500 U.S. national nonprofit membership organizations in all fields. The database is also used to monitor association trends; identify related associations; networking and making professional contacts; marketing to associations, their members and markets.
Structure and Property Data
Bordwell pKa Table (Acidity in DMSO)
This site provides equilibrium constants pKa of many organic compounds with pKa values from 0-35 in DMSO.
BRENDA : Comprehensive Enzyme Information System
Over 3500 enzymes are covered, classified according to the Enzyme Commission (E.C.) numbering system.
A free access service providing a structure-centric community for chemists with millions of chemical structures and integration to a multitude of other online services.
Genome Biology (NCBI)
Biology tools and resources, including organism-specific pages that include links to many web sites and databases.
Household Products Database (NLM)
Information about consumer brands and the health effects listed in Material Safety Data Sheets (MSDS).
Landolt-Börnstein Substance / Property Index
Information about substances and related properties.
NIST Chemistry WebBook
Thermochemical, thermophysical, and ion energetics data compiled by NIST under the Standard Reference Data Program.
PubChem provides information on the biological activities of small molecules. It is a component of NIH's Molecular Libraries Roadmap Initiative.
Contains a wealth of chemistry data, and provides you with chemical computations in the context of a given search. An effective learning tool for students looking for ways to learn and test their knowledge of chemistry basics.
These databases specialize in searching patent literature and are sources for the full-text of patents.