Natural Citronellal (3,7-dimethyl-6-octenal) is a natural monoterpenoid aldehyde with a fresh, lemon-green aroma, isolated from citronella oil, lemongrass oil, or Eucalyptus citriodora oil by fractional distillation.
It serves as a key starting material for synthesizing hydroxycitronellal, menthol, and other aroma chemicals, and has inherent insect-repellent properties.