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Research Guides

CHEM 212: Organic Chemistry II: Home

Borrowing from Other Libraries

Can't find what you're looking for at Wellesley?

Use WorldCat Discovery to search and request directly from libraries worldwide via Interlibrary Loan.

Questions? Interlibrary Loan Guide


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CAS Registry Numbers


SciFinder Search Tips & Support

How to Search for Chemicals

  • Name
    • You can use trade names, common names, or IUPAC names.
    • Databases that use chemical 'indexing' (like SciFinder) usually include results for alternative names for the same chemical
    • Searching by name in a more general database (like Web of Science) may get inconsistent results, since they don't include synonyms
  • Molecular Formula
    • Very rarely useful to search, because there are so many chemicals with the same formula!
  • Molecular Structure
    • Sometimes useful because it can allow you to do similarity searching and substructure searching. Sometimes it is overkill when you have a name (quicker).
  • CAS Registry Number - best option if available!
    • If the tool you are using allows for CAS Registry Number, this will be your best bet.  CAS Registry Numbers are like social security numbers for chemicals. Names can change, molecular formulas can be shared, but CAS numbers are unique to that chemical!


Use this software to draw chemical structures. Draw professional looking structures for your lab reports, presentations, and Organic Chemistry II Paper!