|Jmol 3D model||Interactive image
|Molar mass||108.14 g·mol−1|
|Density||1.044 g cm−3|
|Melting point||−15.2 °C (4.6 °F; 257.9 K)|
|Boiling point||205.3 °C (401.5 °F; 478.4 K)|
|3.50 g/100 mL (20 °C)
4.29 g/100 mL (25 °C)
|Solubility in other solvents||Soluble[vague] in benzene, methanol, chloroform, ethanol, ether, acetone|
|Vapor pressure||0.18 kPa (60 °C)|
Refractive index (nD)
|217.8 J/K mol|
Std enthalpy of
|Safety data sheet||External MSDS|
|Flash point||93 °C (199 °F; 366 K)|
|436 °C (817 °F; 709 K)|
|Lethal dose or concentration (LD, LC):|
LD50 (median dose)
|1250 mg/kg (rat, oral)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Benzyl alcohol is an aromatic alcohol with the formula C6H5CH2OH. The benzyl group is often abbreviated "Bn" (not to be confused with "Bz" which is used for benzoyl), thus benzyl alcohol is denoted as BnOH. Benzyl alcohol is a colorless liquid with a mild pleasant aromatic odor. It is a useful solvent due to its polarity, low toxicity, and low vapor pressure. Benzyl alcohol is partially soluble in water (4 g/100 mL) and completely miscible in alcohols and diethyl ether. The anion produced by deprotonation of the alcohol group is known as benzylate or benzyloxide.
- C6H5CH2Cl + NaOH → C6H5CH2OH + NaCl
- C6H5CH2OH + NCCHCH2 → C6H5CH2N(H)C(O)CHCH2
Benzyl alcohol is used as a general solvent for inks, waxes, shellacs, paints, lacquers, and epoxy resin coatings. Thus it can be used in paint strippers, especially when combined with compatible viscosity enhancers to encourage the mixture to cling to painted surfaces. It is a precursor to a variety of esters, used in the soap, perfume, and flavor industries. When applied to damaged skin or mucous membranes at a 10% concentration it acts as a local anaesthetic and antimicrobial agent, and is sometimes included as a degreaser in rug cleaning products. As a dye solvent, it enhances the process of dying wool, nylon, and leather. It also has use as a photographic developer, and as an insect repellent.
Use in health care
Benzyl alcohol is used as a bacteriostatic preservative at low concentration in intravenous medications, cosmetics and topical drugs.
The use of benzyl alcohol as a 5% solution has been approved by the U.S. FDA for the treatment of head lice in children older than 6 months and in adults. It affects the louse's spiracles, preventing them from closing. These then become clogged with water or mineral oil or other matter and cause the insect to die from asphyxiation.
Benzyl alcohol has nearly the same refraction index of quartz and wool fibre. If a clear quartz object is immersed in benzyl alcohol, it becomes almost invisible. This test has been used to determine non-destructively whether an object is truly made of quartz (see crystal skull). Similarly, white wool immersed in benzyl alcohol also becomes almost invisible clearly revealing contaminants such as dark and medullated fibers and vegetable matter.
Benzyl alcohol has low acute toxicity with an LD50 of 1.2 g/kg in rats. It oxidizes rapidly in healthy individuals to benzoic acid, conjugated with glycine in the liver, and excreted as hippuric acid. Very high concentrations can result in toxic effects including respiratory failure, vasodilation, hypotension, convulsions, and paralysis.
Benzyl alcohol has been reported to cause skin allergy.
Benzyl alcohol is not considered to be a carcinogen and no data are available regarding teratogenic or reproductive effects.
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