Reaxys

Reaxys provides web-based access to chemical structure, reaction and property information; its contents are derived from Beilstein (organic compounds) and Gmelin (inorganic and organometallic compounds), which date to the 18th and 19th centuries, as well as selected English-language chemical patents (US,EP, and WO) from 1976-present).

Coverage: 1771-

http://www.lib.umn.edu/get/12017