Benzoyl chloride

मुक्त ज्ञानकोश विकिपीडिया से
नेविगेशन पर जाएँ खोज पर जाएँ

साँचा:distinguish साँचा:chembox

Benzoyl chloride, also known as benzenecarbonyl chloride, is an organochlorine compound with the formula C7H5ClO. It is a colourless, fuming liquid with an irritating odour. It is mainly useful for the production of peroxides but is generally useful in other areas such as in the preparation of dyes, perfumes, pharmaceuticals, and resins.

Preparation

Benzoyl chloride is produced from benzotrichloride using either water or benzoic acid:[१]

C6H5CCl3 + H2O → C6H5COCl + 2 HCl
C6H5CCl3 + C6H5CO2H → 2 C6H5COCl + HCl

As with other acyl chlorides, it can be generated from the parent acid and standard chlorinating agents such as phosphorus pentachloride, thionyl chloride, and oxalyl chloride. It was first prepared by treatment of benzaldehyde with chlorine.[२]

An early method for production of benzoyl chloride involved chlorination of benzyl alcohol.[३]

Reactions

It reacts with water to produce hydrochloric acid and benzoic acid:

C6H5COCl + H2O → C6H5COOH + HCl

Benzoyl chloride is a typical acyl chloride. It reacts with alcohols to give the corresponding esters. Similarly, it reacts with amines to give the amide.[४][५]

It undergoes the Friedel-Crafts acylation with aromatic compounds to give the corresponding benzophenones and related derivatives.[६] With carbanions, it serves again as a source of the benzoyl cation synthon, C6H5CO+.[७]

Benzoyl peroxide, a common reagent in polymer chemistry, is produced industrially by treating benzoyl chloride with hydrogen peroxide and sodium hydroxide:[८]

2 C6H5COCl + H2O2 + 2 NaOH → (C6H5CO)2O2 + 2 NaCl + 2 H2O

References

  1. साँचा:cite encyclopedia
  2. साँचा:cite journal
  3. US1851832, 29 March 1932
  4. साँचा:cite journal
  5. Prasenjit Saha, Md Ashif Ali, and Tharmalingam Punniyamurthy "Ligand-free Copper(ii) Oxide Nanoparticles Catalyzed Synthesis Of Substituted Benzoxazoles" Org. Synth. 2011, volume 88, pp. 398. doi:10.15227/orgsyn.088.0398. (an illustrative reaction of an amine with benzoyl chloride).
  6. साँचा:cite journal
  7. साँचा:cite journal
  8. साँचा:cite techreport

External links