Calculating Unsaturation To calculate number of unsaturations: Find the number of hydrogens the carbons would have if the compounds were saturated(CnH2n+2) Subtract the actual number of hydrogens and divide by 2. This calculation cannot distinguish between unsaturations from multiple bonds and those from rings. 2013 Pearson Education Inc. Calculating Unsaturation To calculate number of unsaturations: • Find the number of hydrogens the carbons would have if the compounds were saturated (CnH2n+2). • Subtract the actual number of hydrogens and divide by 2. • This calculation cannot distinguish between unsaturations from multiple bonds and those from rings. 8 © 2013 Pearson Education Inc