Natural Benzaldehyde-HB Encyclopedia Mar 23, 2022

Natural benzaldehyde is widely present in the plant kingdom, especially in Rosaceae plants, mainly in the form of glycosides in the bark, leaves or seeds of plants, such as amygdalin in bitter almonds. Benzaldehyde is naturally present in essential oils such as bitter almond oil, ageratum oil, hyacinth oil, and ylang ylang oil. The chemical properties of benzaldehyde are similar to those of fatty aldehydes, but there are differences.

Chemical parameters

【FEMA No.】2127
【Alias】bitter almond oil, benzoin aldehyde
【Molecular formula】 C7H6O

【Molecular weight】 106.12

【Cas】100-52-7

Physical and chemical indicators

Content………… ≥99.00%
Aroma………… with almond notes
Density (25/25℃) ………… 1.0410-1.0460
Refraction (20℃) ………… 1.5440-1.5470
Solubility………… 1ml whole sample dissolved in 2.5ml 60% ethanol

Use

Natural benzaldehyde can be used as a raw material for organic synthesis for the manufacture of cinnamaldehyde, cinnamic acid and its esters, as well as for the preparation of mixtures of benzyl alcohol and benzoic acid and herbicides; it is also used to synthesize chloramphenicol, DL-phenylglycine , the intermediate of ephedrine, 2- nitrobenzaldehyde .

Preparation

The hydrolysis reaction of cinnamaldehyde under base catalysis is a reverse aldol condensation reaction.
In the reaction, the natural cinnamaldehyde present in cinnamon oil is hydrolyzed under alkali catalysis to form benzaldehyde and acetaldehyde with a lower boiling point. Therefore, with the escape of acetaldehyde, the reaction can be carried out in the direction that is beneficial to the generation of benzaldehyde. Because no other reactants were introduced during the reaction, the benzaldehyde basically maintained its natural characteristics.

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