Tuesday, December 17, 2013

Fragmentation and mass spectra of Aldehydes


  • Molecular ion peak is very weak.
  • M-1 peak is good diagnostic peak, even for long chain Aldehyde.
  • In lower aldehydes, α-cleavage is prominent with retention of charge on oxygen.
  • In straight chain Aldehydes, the other diagnostic peaks are at 
  1. M-18 because loss of water
  2. M-28 because loss of ethylene
  3. M-43 because loss of CH2=CH-O
  4. M-44 because loss of CH2=CH-OH

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