1900s-present. Citations & abstracts. Largest substance database with more than 26 million substances, including 12 million organic substances. World's most comprehensive database of chemical literature and patents. The link leads to instructions for accessing the database.
Training materials for using SciFinder-n can be found here: https://www.cas.org/support/training/scifinder-n
Chemical information database including content from the Crossfire databases, Beilstein and Gmelin. Search inorganic, organic or organometallic substances. Reaction, citation and experimental data are available in this database. Some patent information is also available.