Chemistry:Benzoyl chloride
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| Preferred IUPAC name
Benzoyl chloride | |||
Other names
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| Identifiers | |||
3D model (JSmol)
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PubChem CID
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| UN number | 1736 | ||
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| Properties | |||
| C 6H 5COCl | |||
| Molar mass | 140.57 g·mol−1 | ||
| Appearance | colorless liquid | ||
| Odor | Benzaldehyde-like, but more pungent | ||
| Density | 1.211 g/mL[1] | ||
| Melting point | −1 °C (30 °F; 272 K)[1] | ||
| Boiling point | 198 °C (388 °F; 471 K)[1] | ||
| Reacts. Decomposes to HCl and benzoic acid. | |||
| Vapor pressure | 1 hPa (0.75 mmHg) (32 °C (90 °F; 305 K))[1] | ||
| −75.8×10−6 cm3/mol | |||
| Viscosity | 0.0012 Pa·s[2] | ||
| Structure | |||
| Cs | |||
| Hazards | |||
| GHS pictograms |   
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| GHS Signal word | Danger | ||
| H227, H302+312Script error: No such module "Preview warning".Category:GHS errors, H314, H317, H331, H402 | |||
| P210, P261, P264, P270, P271, P272, P273, P280, P301+312+330Script error: No such module "Preview warning".Category:GHS errors, P301+330+331, P303+361+353, P304+340+310, P305+351+338+310, P333+313, P363, P370+378, P403+233, P403+235, P405, P501 | |||
| NFPA 704 (fire diamond) | |||
| Flash point | 72 °C (162 °F; 345 K)[1] | ||
| 600 °C (1,112 °F; 873 K)[1] | |||
| Explosive limits | 2.5% to 27%(V)[1] | ||
Threshold limit value (TLV)
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0.5 ppm[2] (C) | ||
| Lethal dose or concentration (LD, LC): | |||
LD50 (median dose)
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LC50 (median concentration)
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3.03 mg/L (Inhalation, rat, 4h)[2] | ||
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Related compounds
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |||
 verify (what is   ?)
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| Infobox references | |||
Benzoyl chloride, also known as benzenecarbonyl chloride, is an organochlorine compound with the formula C
6H
5COCl. It is a colourless, fuming liquid with an irritating odour, and consists of a phenyl ring (C
6H
5) with an acyl chloride (–C(=O)Cl) substituent. It is mainly useful for the production of organic peroxides but is also used in other areas such as in the preparation of dyes, perfumes, pharmaceuticals, and resins.[3]
Preparation
Benzoyl chloride is produced from benzotrichloride using either water or benzoic acid:[3]
- C
6H
5CCl
3 + H
2O → C
6H
5COCl + 2 HCl - C
6H
5CCl
3 + C
6H
5CO
2H → 2 C
6H
5COCl + 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.[4]
An early method for production of benzoyl chloride involved chlorination of benzyl alcohol.[5][better source needed]
Reactions
It reacts with water to produce hydrochloric acid and benzoic acid:
- C
6H
5COCl + H
2O → C
6H
5COOH + 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.[6][7]
It undergoes the Friedel-Crafts acylation with aromatic compounds to give the corresponding benzophenones and related derivatives.[8] With carbanions, it serves again as a source of the benzoyl cation synthon, C
6H
5CO+
.[9]
Benzoyl peroxide, a common reagent in polymer chemistry, is produced industrially by treating benzoyl chloride with hydrogen peroxide and sodium hydroxide:[10]
- 2 C
6H
5COCl + H
2O
2 + 2 NaOH → (C
6H
5CO)
2O
2 + 2 NaCl + 2 H
2O
Modified benzoyl chlorides
Many substituted derivatives of benzoyl chloride are known. 4-Nitrobenzoyl chloride is a precursor to the anesthetic procaine.[3] One example is 4-chlorobenzoyl chloride, a precursor to 4-chloro-4'-hydroxybenzophenone, which is used to make high performance polymers.[11]
Safety
Benzoyl chloride is toxic and a serious skin irritant.[3]
See also
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Sigma-Aldrich Co., Benzoyl chloride. Retrieved on 3 January 2026.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 "Benzoyl chloride SDS". ThermoFisher. 21 December 2025. p. 5. https://documents.thermofisher.com/DirectWebViewer/private/document.aspx?prd=ALFAAA14107~~PDF~~MTR~~AGHS~~EN~~2025-12-22%2000:00:59~~Benzoyl%20chloride~~.
- ↑ 3.0 3.1 3.2 3.3 Maki, Takao; Takeda, Kazuo. "Ullmann's Encyclopedia of Industrial Chemistry". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a03_555.
- ↑ Wöhler, Friedrich; von Liebig, Justus (1832). "Untersuchungen über das Radikal der Benzoesäure" (in German). Annalen der Pharmacie 3 (3): 262–266. doi:10.1002/jlac.18320030302.
- ↑ Wilmot, H.B. & P.J. Garnett, "Manufacture and production of benzoyl chloride", US patent 1851832, published 1932-03-29, issued 1932-03-29
- ↑ Marvel, C. S.; Lazier, W. A. (1929). "Benzoyl Piperidine". Organic Syntheses 9: 16. doi:10.15227/orgsyn.009.0016. http://www.orgsyn.org/demo.aspx?prep=CV1P0099.; Collective Volume, 1, 1941, pp. 99
- ↑ Saha, P.; Ali, M. A.; Punniyamurthy, T. (2011). "Ligand-free Copper(ii) Oxide Nanoparticles Catalyzed Synthesis Of Substituted Benzoxazoles". Organic Syntheses 88: 398-405. doi:10.15227/orgsyn.088.0398.
- ↑ Minnis, W. (1932). "Phenyl Thienyl Ketone". Organic Syntheses 12: 62. doi:10.15227/orgsyn.012.0062. http://www.orgsyn.org/demo.aspx?prep=CV2P0520.; Collective Volume, 2, 1943
- ↑ Fujita, M.; Hiyama, T. (1990). "Phenyl Thienyl Ketone". Organic Syntheses 69: 44. doi:10.15227/orgsyn.069.0044. http://www.orgsyn.org/demo.aspx?prep=CV8P0326.; Collective Volume, 8, 1993
- ↑ El-Samragy, Yehia (2004). "Chemical and Technical Assessment". Benzoyl Peroxide (PDF). 61st JECFA (Technical report). Joint FAO/WHO Expert Committee on Food Additives. p. 1. Retrieved 31 October 2013.
Benzoyl peroxide is synthesized commercially by the reaction of benzoyl chloride, sodium hydroxide, and hydrogen peroxide. Traces of benzoic acid remain after usual purification procedures.
- ↑ Parker, David; Bussink, Jan; Van De Grampel, Hendrik T.; Wheatley, Gary W.; Dorf, Ernst-Ulrich; Ostlinning, Edgar; Reinking, Klaus; Schubert, Frank et al.. "Ullmann's Encyclopedia of Industrial Chemistry". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a21_449.pub4.
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