There is useful information at these sites!

  GMU Library Databases gives you access to The Handbook of Chemistry and Physics and the Dictionary of Organic Compounds among others. [If you are off-campus, access these databases through the Library link/Research Databases.]
  Here are two sites where you can search for chemical information: ChemSpider and eMolecules
  Try the Structure Search button on this WWW Chemicals Network page which comprises the searchable catalogs of more than twenty chemical companies.