SciFinder-n provides access to a variety of different sources of chemical information. Here are a few of the features you may find helpful:
CAPlus - bibliographic entries from Chemical Abstracts back to 1907. Over 1,500 core chemical journals are included, as well as patents, books, conference proceedings, etc. Link out to OLinks to connect to electronic full text or check for print holdings.
CAS REGISTRY - Chemicals and biochemical sequences searchable by name, number, formula, or structure, with experimental and predicted property data.
CHEMLIST - Registry of regulated chemicals.
CHEMCATS - Chemical supplier catalogs.
CASREACsT - Individually indexed reaction schemes back to 1840.
MARPAT - Searchable Markush structures from patents covered by CAS from 1988.
CIN (Chemical Industry Notes) - bibliographic entries from chemical industry trade publications from 1974.