IUPAC or Systematic Names International Union of Pure and Applied Chemistry. Standard method used internationally to name compounds. Uses the longest chain of carbons as the main chain. ● Common names kept:methane,ethane, propane,and butane. 2013 Pearson Education,Inc. Chapter3 8© 2013 Pearson Education, Inc. IUPAC or Systematic Names • International Union of Pure and Applied Chemistry. • Standard method used internationally to name compounds. • Uses the longest chain of carbons as the main chain. • Common names kept: methane, ethane, propane, and butane. Chapter 3 8