Chemistry

The online version of Organic Syntheses (QD262 .O7). Because Organic Syntheses has been published with grant funds and is a cooperative venture among chemists and other scientists, its full text is available online free of charge. In addition, updated material not yet available in print appears on the site.

provides a catalog of organic & inorganic chemicals that includes images, descriptions, molecular formulas, and pricing.

Lists general, government, and manufacturer MSDS sites.

A free database of over 34 million chemical structures, properties, and associated information.

Created to help the scientific community to speed up drug discovery, Molport lists 9 million chemical compounds with their chemical information, patents, pricing, and more.

This NIST site contains thermochemical data for over 7000 organic and small inorganic compounds, reaction thermochemistry data for over 8000 reactions, IR spectra for over 16,000 compounds, mass spectra for over 15,000 compounds, and much more.

Convert just about anything to anything else. Over 5,000 units and 50,000 conversions.

Find properties, information, and diagrams of chemical elements, compounds, reactions, and more in an easily searchable interface.

Hundreds of thousands of free spectra available, NMR, IR, Raman, UV-Vis, and mass spectra by chemical name, synonym, CAS Registry Number, or InChIKey. Users can zoom in on the spectra and upload and overlay their own spectrum for comparison.