Alkanes and IUPAC Naming

Introduction to Alkanes

• Alkanes are hydrocarbons, meaning they are composed of only carbon and hydrogen atoms.

• They are classified as aliphatic compounds, characterized by carbon-carbon (C-C) and carbon-hydrogen (C-H) single (sigma) bonds.

• Alkanes can be either:

  • Acyclic: Straight or branched chains of carbons.

  • Cyclic: Carbon atoms form a ring structure.

Alkane Formulas and Saturation

• Acyclic Alkanes: The general formula for a non-cyclic alkane is Cn H{(2n+2)}, where n is the number of carbon atoms.

• Example: If an alkane has n=4 carbons, it will have 2(4)+2 = 10 hydrogens, so its formula is C4 H{10}.

• Example: For n=10 carbons, there would be 2(10)+2 = 22 hydrogens, so C{10} H{22}.

• Saturated Hydrocarbons: Alkanes are considered saturated hydrocarbons because they contain the maximum possible number of hydrogen atoms for their given number of carbon atoms, meaning they only have carbon-carbon and carbon-hydrogen single bonds and no double or triple bonds. This distinguishes them from unsaturated hydrocarbons like alkenes and alkynes.