Benzaldehyde is an organic compound consisting of a benzene ring with a formyl substituent. It is the simplest aromatic aldehyde and one of the most industrially useful. Benzaldehyde was first extracted in 1803 from bitter almonds and can also be synthesized from toluene through chlorination and oxidation or from benzyl alcohol through partial oxidation. It is used as a flavoring agent in imitation almond extract and in the production of other compounds like ephedrine and chloramphenicol.

1. ONLINE CLASS
Purvanchal University
Presenter: Mr. Yograj Podar

2. BENZALDEHYDE
[Preparation and uses]
 Benzaldehyde (C6H5CHO) is an organic
compound consisting of a benzene ring with
a formyl substituent.
 It is the simplest aromatic aldehyde and one of the most
industrially useful
 It is a colorless liquid with a characteristic almond-like odor.
 The primary component of bitter almond oil, benzaldehyde
can be extracted from a number of other natural sources.
 Synthetic benzaldehyde is the flavoring agent in imitation
almond extract, which is used to flavor cakes and other baked
goods.

4.  BACKGROUNDS:
 Benzaldehyde was first extracted in 1803 by the French pharmacist
Martrès from the bitter almonds, the fruit of Prunus dulcis.[7
 In 1832, Friedrich Wöhler and Justus von Liebig first synthesized
benzaldehyde.[9]
 Liquid phase chlorination and oxidation of toluene are the main
routes.
 Numerous other methods have been developed, such as the partial
oxidation of benzyl alcohol, alkali hydrolysis of benzal chloride, and
the carbonylation of benzene.
 Most of the benzaldehyde that people eat is from natural plant
foods, such as almonds.[14]

6. Preparation of Benzaldehyde:
PREPARATION OF
BENZALDEHYDE

7. MECHANISM
CS2
CS2

8. USES

9. Fig. 2: Ephedrine from
Benzaldehyde
Fig. 1: Chloramphenicol from
Benzaldehyde

10. ACETOPHENONE
[Preparation and uses]

11. Preparation of acetophenone

12. Thank
You
USES of acetophenone