Along with SciFindern and Reaxys, here are some other good "starting place" databases to find basic information about chemical compounds: molecular weight, CAS Registry numbers and common physical property data. However, they are not as useful if you need physical properties beyond the basics, or information on the synthesis or preparation.
Use the Material Property Search to select the compound you want to search, then drop and drag from the list of available properties to find data in downloadable tables and/or interactive graphs.