SciFinder Logo

SciFinder is a research tool which provides access to substance, reaction and reference information. Content is updated daily by a global network of scientists. SciFinder offers: substance information including chemical structures, chemical names, CAS Registry Numbers, properties, commercial availability and regulatory information; chemical reaction information including reaction schemes, experimental procedures, conditions, yields, solvents, catalysts as well as commercial availability of substances; chemistry and related science information found in journals, patents, dissertations and more. Coverage includes CAplus and MEDLINE.

The search examples document (see 'Examples for SciFinder training') offers ideas to explore some of the substance and reaction search features.

Supported browsers

Please see the Quick links for system recommendations and requirements, including supported browsers.

Complimentary access

CAS are currently offering complimentary SciFinder access for some categories of unemployed former SciFinder users (e.g. unemployed researchers previously employed through third-party contract research organisations). If you think you may be eligible, complete the SciFinder access request form and CAS will contact you directly.


  • Click 'Register with SciFinder' in the Quick links (you'll be prompted to log in to MUSE as necessary).
  • The SciFinder 'Welcome to User Registration' page will open. Click 'Next' to begin registration as a new user.
  • Follow the instructions on screen and complete the contact information form. You must use your University of Sheffield email address to register.
  • You'll receive an email to confirm your registration. You must click the link within the email within 48 hours or you'll have to register again.


Access is available directly from this page by connecting to the SciFinder website - you'll be prompted to log in to MUSE as necessary. Once connected to SciFinder, you will need to log in using the username and password you created when you registered.


If you experience any difficulties in using this eResource please call the Library HelpDesk on extension 27200 or email