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TOLUALDEHYDES

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TOLUALDEHYDES Basic information
TOLUALDEHYDES Chemical Properties
Safety Information
  • ToxicityLD50 oral in rat: 2250mg/kg
TOLUALDEHYDES Usage And Synthesis
  • Chemical PropertiesColorless liquid. Slightly soluble inwater; soluble in alcohol and ether. There are also oand misomers. Combustible.
  • Chemical PropertiesTolualdehydes, mixed o-, m-, p-, have a sweet and herbaceous odor reminiscent of bitter almond.
  • OccurrenceReported found in roasted nuts, tomato, cooked beef, beef fat, cider, coffee, tea and elderberry juice.
  • UsesPerfumes, pharmaceutical and dyestuff intermediate, flavoring agent.
  • PreparationBy oxidation of o-, m-, or p-xylene (chemical or electrolytical oxidation).
  • Taste threshold valuesTaste characteristics at 15 ppm: cherry pit, coumarin, almond, sweet, with a slight powdery hay and vanillalike nuance.
  • MetabolismAromatic aldehydes are oxidized in vivo almost entirely to the corresponding acid. Thus, in rabbits, p-tolualdehyde is converted to p-toluic acid which has been detected in the urine as the ester glucuronide (Williams, 1959). p-Tolualdehyde was oxidized to p-toluic acid by resting cells of Pseudomonas aeruginosa (Omori & Yamada, 1970). Perillaldehyde dehydrogenase, isolated from a soil pseudomonad, catalysed the oxidation of m- and p-tolualdehyde but not of o-tolualdehyde (Ballal, Bhattacharyya & Rangachari, 1967). The reduction of p-tolualdehyde by NADH was catalysed by horse-liver alcohol dehydrogenase (Blomquist, 1966) and by yeast alcohol dehydrogenase at pH 8.5-9.5 (Klinman, 1975). A non-specific NADPH-linked aldehyde reductase isolated from various areas of bovine brain also catalysed the reduction of p-tolualdehyde (Tabakoff & Erwin, 1970).
TOLUALDEHYDES Preparation Products And Raw materials
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