Phenacyl chloride
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| Names | |
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Preferred IUPAC name
2-Chloro-1-phenylethan-1-one
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| Other names
2-Chloro-1-phenylethanone
alpha-Chloroacetophenone 2-Chloroacetophenone Chloromethyl phenyl ketone Phenyl chloromethyl ketone |
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| Identifiers | |
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3D model (Jmol)
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| ChemSpider | |
| ECHA InfoCard | 100.007.757 |
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PubChem CID
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| Properties | |
| C8H7ClO | |
| Molar mass | 154.59 g·mol−1 |
| Appearance | white to gray crystalline solid |
| Odor | pungent and irritating |
| Density | 1.324 g/cm3 |
| Melting point | 54 to 56 °C (129 to 133 °F; 327 to 329 K) |
| Boiling point | 244.5 °C (472.1 °F; 517.6 K) |
| insoluble | |
| Vapor pressure | 0.005 mmHg (20 °C) |
| Hazards | |
| Main hazards | Combustible |
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EU classification (DSD)
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 T |
| NFPA 704 | |
| Flash point | 88 °C (190 °F; 361 K) |
| Lethal dose or concentration (LD, LC): | |
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LCLo (lowest published)
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417 mg/m3 (rat, 15 min) 600 mg/m3 (mouse, 15 min) 465 mg/m3 (rabbit, 20 min) 490 mg/m3 (guinea pig, 30 min) 159 mg/m3 (human, 20 min) 850 mg/m3 (human, 10 min) |
| US health exposure limits (NIOSH): | |
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PEL (Permissible)
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TWA 0.3 mg/m3 (0.05 ppm) |
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REL (Recommended)
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TWA 0.3 mg/m3 (0.05 ppm) |
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IDLH (Immediate danger)
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15 mg/m3 |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is   ?) |
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| Infobox references | |
Phenacyl chloride is a substituted acetophenone. It is a useful building block in organic chemistry. Apart from that, it has been historically used as a riot control agent, where it is designated CN. It should not be confused with cyanide, another agent used in chemical warfare, which has the chemical structure CN−.
Phenacyl chloride is readily available commercially. It may be synthesized by the Friedel-Crafts acylation of benzene using chloroacetyl chloride, with an aluminium chloride catalyst:
It was investigated, but not used, during the First and Second World Wars.
Because of its significantly greater toxicity, it has largely been supplanted by CS gas. Even though CN is still supplied to paramilitary and police forces in a small pressurized aerosol known as “Mace” or tear gas, its use is falling as pepper spray both works and disperses more quickly than CN.
The term "Mace" came into being because it was the brand-name invented by one of the first American manufacturers of CN aerosol sprays. Subsequently, In the United States, Mace became synonymous with tear-gas sprays in the same way that Kleenex has become strongly associated with facial tissues (a phenomenon known as a genericized trademark).
Like CS gas, this compound irritates the mucous membranes (oral, nasal, conjunctival and tracheobronchial). Sometimes it can give rise to more generalized reactions such as syncope, temporary loss of balance and orientation. More rarely, cutaneous irritating outbreaks have been observed and allergic contact permanent dermatitis.
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