Chemguide Helping you to understand chemistry
ChemSpider ChemSpider is a free chemical structure database providing fast text and structure search access to over 34 million structures from hundreds of data sources.
Common Chemistry CAS Registry Numbers for approximately 7,900 chemicals of widespread general public interest.
International Union of Pure and Applied Chemistry UPAC is the universally-recognized authority on chemical nomenclature and terminology
Meet the Elements - The Scholarly Kitchen
Organic Synthesis A publication of reliable methods for the preparation of organic compounds.
PubChem Free database of chemical structures of small organic molecules and information on their biological activities.