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The American Chemistry Society is where working chemists start to find out current research in their area. The ACS publications are written by chemists for an audience of chemists.
ScienceDirect has non-ACS chemistry journals as well as interdisciplinary journals related to chemistry. This site also has e-books available.
Includes over 2,000 journals and 35,000 books published by Elsevier Science and its subsidiary publishers, including Academic Press, Cell Press, Pergamon, Mosby, and Saunders journals. Coverage is particularly strong for the life and physical sciences, medicine, and technical fields, but also includes some social sciences and humanities.
Includes chemistry, chemical engineering, clinical medicine, computer science, earth & planetary sciences, economics, engineering, energy & technology, environmental science & technology, life sciences, materials science, mathematics, physics, astronomy.
This reference work contains frequently used data in science including periodical table of elements, basic constants and unites, and geophysical data. It is updated annually.
The Royal Society of Chemistry is the professional equivalent of the American Chemical Society in Great Britain. This are professional publications for an audience of chemists.
From the National Library of Medicine, this collection of information "provides references covering the biochemical, pharmacological, physiological, and toxicological effects of drugs and other chemicals." This is mostly citations instead of full text articles. Coverage goes back to 1999.
This database has over 39 million chemical reactions. You can search by drawing in chemical structures and then limiting to reagent, solvent, etc. Java has to be enabled to use the drawing function.
Combined web access to Beilstein, Gmelin, and Patent Chemistry Database. Search by chemical structures or reactions to retrieve physical/chemical properties, spectra, related reactions, description of reactions as well as references to the literature in which the data appear. It also includes the synthesis planner tool.
This multi-volume set includes physical properties and processes of most commercially available chemicals. There are also references at the end of the articles for further research.
Experimental data and correlations of temperature-dependent properties for over 1,600 pure chemicals. Provides data sets, DIPPR-approved property constants, and regressed correlation coefficients for temperature-dependent properties.
Merck Index is a reference tool that contains short entries on various compounds including drugs. The entries will contain CAS registry number, synonyms of the substances, chemical formula, molecular weight, various physical properties, and references to further information about that substance.
CRC Handbook of Chemistry and Physics by 
