In chemistry , an alcohol is any organic compound in which the hydroxyl functional group (– O H ) is bound to a saturated carbon atom. The term alcohol originally referred to the primary alcohol ethanol (ethyl alcohol), which is used as a drug and is the main alcohol present in alcoholic beverages .
The suffix -ol appears in the IUPAC chemical name of all substances where the hydroxyl group is the functional group with the highest priority; in substances where a higher priority group is present the prefix hydroxy- will appear in the International Union of Pure and Applied Chemistry (IUPAC) name. The suffix -ol in non-systematic names (such as paracetamol or cholesterol ) also typically indicates that the substance includes a hydroxyl functional group and, so, can be termed an alcohol. But many substances, particularly sugars (examples glucose and sucrose ) contain hydroxyl functional groups without using the suffix. An important class of alcohols, of which methanol and ethanol are the simplest members is the saturated straight chain alcohols, the general formula for which is C n H 2n+1 OH.
Rhazes (854 CE – 925 CE), was a Persian  polymath , physician , alchemist , and philosopher who discovered numerous compounds and chemicals including "alcohol" by developing several chemical instruments and methods of distillation.
The word "alcohol" is from the Arabic
), a powder used as an eyeliner.
is the Arabic
, equivalent to
was originally used for the very fine powder produced by the
of the natural mineral
3 , hence the essence or "spirit" of this substance. It was used as an antiseptic , eyeliner, and cosmetic . The meaning of alcohol was extended to distilled substances in general, and then narrowed to ethanol, when "spirits" was a synonym for hard liquor . 
Bartholomew Traheron , in his 1543 translation of John of Vigo , introduces the word as a term used by "barbarous" ( Moorish ) authors for "fine powder." Vigo wrote: "the barbarous auctours use alcohol, or (as I fynde it sometymes wryten) alcofoll, for moost fine poudre."
The 1657 Lexicon Chymicum , by William Johnson glosses the word as "antimonium sive stibium."  By extension, the word came to refer to any fluid obtained by distillation, including "alcohol of wine," the distilled essence of wine. Libavius in Alchymia (1594) refers to "vini alcohol vel vinum alcalisatum". Johnson (1657) glosses alcohol vini as "quando omnis superfluitas vini a vino separatur, ita ut accensum ardeat donec totum consumatur, nihilque fæcum aut phlegmatis in fundo remaneat." The word's meaning became restricted to "spirit of wine" (the chemical known today as ethanol ) in the 18th century and was extended to the class of substances so-called as "alcohols" in modern chemistry after 1850.
is used in scientific publications and where precise identification of the substance is important, especially in cases where the relative complexity of the molecule does not make such a systematic name unwieldy. In the IUPAC system, in naming simple alcohols, the name of the alkane chain loses the terminal "e" and adds "ol",
, as in "methanol" and "ethanol".
When necessary, the position of the hydroxyl group is indicated by a number between the alkane name and the "ol":
2 OH , propan-2-ol for CH
3 . If a higher priority group is present (such as an aldehyde , ketone , or carboxylic acid ), then the prefix "hydroxy" is used,  e.g., as in 1-hydroxy-2-propanone ( CH
2 OH ). 
2-methyl-1-propanol tert -amyl alcohol,
2-methyl-2-butanolA primary alcoholA secondary alcoholA secondary alcoholA primary alcoholA tertiary alcohol
In other less formal contexts, an alcohol is often called with the name of the corresponding alkyl group followed by the word "alcohol", e.g., methyl alcohol, ethyl alcohol. Propyl alcohol may be n-propyl alcohol or isopropyl alcohol , depending on whether the hydroxyl group is bonded to the end or middle carbon on the straight propane chain. As described under systematic naming, if another group on the molecule takes priority, the alcohol moiety is often indicated using the "hydroxy-" prefix. 
Alcohols are then classified into primary, secondary ( sec- , s- ), and tertiary ( tert- , t- ), based upon the number of carbon atoms connected to the carbon atom that bears the hydroxyl functional group . (The respective numeric shorthands 1°, 2°, and 3° are also sometimes used in informal settings.  ) The primary alcohols have general formulas RCH 2 OH. The simplest primary alcohol is methanol (CH 3 OH), for which R=H, and the next is ethanol, for which R=CH 3 , the methyl group . Secondary alcohols are those of the form RR'CHOH, the simplest of which is 2-propanol (R=R'=CH 3 ). For the tertiary alcohols the general form is RR'R"COH. The simplest example is tert-butanol (2-methylpropan-2-ol), for which each of R, R', and R" is CH 3 . In these shorthands, R, R', and R" represent substituents , alkyl or other attached, generally organic groups.
|Chemical formula||IUPAC Name||Common name|
|CH 3 OH||methanol||wood alcohol|
|C 2 H 5 OH||ethanol||alcohol|
|C 3 H 7 OH||propan-2-ol||isopropyl alcohol, rubbing alcohol|
|C 4 H 9 OH||butan-1-ol||butanol, butyl alcohol|
|C 5 H 11 OH||pentan-1-ol||pentanol, amyl alcohol|
|C 16 H 33 OH||hexadecan-1-ol||cetyl alcohol|
|C 2 H 4 (OH) 2||ethane-1,2-diol||ethylene glycol|
|C 3 H 6 (OH) 2||propane-1,2-diol||propylene glycol|
|C 3 H 5 (OH) 3||propane-1,2,3-triol||glycerol|
|C 4 H 6 (OH) 4||butane-1,2,3,4-tetraol||erythritol , threitol|
|C 5 H 7 (OH) 5||pentane-1,2,3,4,5-pentol||xylitol|
|C 6 H 8 (OH) 6||hexane-1,2,3,4,5,6-hexol||mannitol , sorbitol|
|C 7 H 9 (OH) 7||heptane-1,2,3,4,5,6,7-heptol||volemitol|
|Unsaturated aliphatic alcohols|
|C 3 H 5 OH||Prop-2-ene-1-ol||allyl alcohol|
|C 10 H 17 OH||3,7-Dimethylocta-2,6-dien-1-ol||geraniol|
|C 3 H 3 OH||Prop-2-yn-1-ol||propargyl alcohol|
|C 6 H 6 (OH) 6||cyclohexane-1,2,3,4,5,6-hexol||inositol|
|C 10 H 19 OH||2 - (2-propyl)-5-methyl-cyclohexane-1-ol||menthol|
Alkyl chain variations in alcohols
Short-chain alcohols have alkyl chains of 1–3 carbons. Medium-chain alcohols have alkyl chains of 4–7 carbons. Long-chain alcohols (also known as fatty alcohols ) have alkyl chains of 8–21 carbons, and very long-chain alcohols have alkyl chains of 22 carbons or longer. 
"Simple alcohols" appears to be a completely undefined term. However, simple alcohols are often referred to by common names derived by adding the word "alcohol" to the name of the appropriate alkyl group. For instance, a chain consisting of one carbon (a methyl group, CH 3 ) with an OH group attached to the carbon is called "methyl alcohol" while a chain of two carbons (an ethyl group, CH 2 CH 3 ) with an OH group connected to the CH 2 is called "ethyl alcohol." For more complex alcohols, the IUPAC nomenclature must be used. 
Simple alcohols, in particular ethanol and methanol, possess denaturing and inert rendering properties, leading to their use as anti-microbial agents in medicine, pharmacy, and industry.
Encyclopædia Britannica states, "The higher alcohols—those containing 4 to 10 carbon atoms—are somewhat viscous, or oily, and they have heavier fruity odours. Some of the highly branched alcohols and many alcohols containing more than 12 carbon atoms are solids at room temperature." 
Like ethanol, butanol can be produced by fermentation processes. Saccharomyces yeast are known to produce these higher alcohols at temperatures above 75 °F (24 °C). The bacterium Clostridium acetobutylicum can feed on cellulose to produce butanol on an industrial scale. 
Alcohol has a long history of several uses worldwide. It is found in alcoholic beverages sold to adults, as fuel, and also has many scientific, medical, and industrial uses. The term alcohol-free is often used to describe a product that does not contain alcohol.
- Alcoholic beverages , typically containing 3–40% alcohol by volume , have been produced and consumed by humans since pre-historic times. Natural fermentation also produces trace amounts of other alcohols such as 2-methyl-2-butanol and γ-hydroxybutyric acid (GHB), which have psychoactive effects similar to alcohol when used as a drug .
- Antifreeze commonly includes a 50% v/v (by volume) solution of ethylene glycol in water.
- Medical : Ethanol can be used as an antiseptic to disinfect the skin before injections are given, often along with iodine . Ethanol-based soaps are becoming common in restaurants and are convenient because they do not require drying due to the volatility of the compound. Alcohol based gels have become common as hand sanitizers .
- Alcohol fuel : Some alcohols, mainly ethanol and methanol , can be used as fuel. Fuel performance can be increased in forced induction internal combustion engines by injecting alcohol into the air intake after the turbocharger or supercharger has pressurized the air. This cools the pressurized air, providing a denser air charge, which allows for more fuel, and therefore more power.
- Preservative : Alcohol is often used as a preservative for biological specimens in the fields of science and medicine.
- Solvent : Hydroxyl groups (-OH), found in alcohols, are polar and therefore hydrophilic (water loving) but their carbon chain portion is non-polar which make them hydrophobic . The molecule increasingly becomes overall more nonpolar and therefore less soluble in the polar water as the carbon chain becomes longer. Methanol has the shortest carbon chain of all alcohols (one carbon atom) followed by ethanol (two carbon atoms.) Alcohols have applications in industry and science as reagents or solvents . Because of its relatively low toxicity compared with other alcohols and ability to dissolve non-polar substances, ethanol can be used as a solvent in medical drugs, perfumes , and vegetable essences such as vanilla . In organic synthesis , alcohols serve as versatile intermediates.
Ethanol's toxicity is largely caused by its primary metabolite, acetaldehyde (systematically ethanal)   and secondary metabolite, acetic acid .   Many primary alcohols are metabolized into aldehydes then to carboxylic acids whose toxicities are similar to acetaldehyde and acetic acid. Metabolite toxicity is reduced in rats fed N-acetylcysteine   and thiamine . 
Tertiary alcohols cannot be metabolized into aldehydes  and as a result they cause no hangover or toxicity through this mechanism.
Some secondary and tertiary alcohols are less poisonous than ethanol, because the liver is unable to metabolize them into toxic by-products.  This makes them more suitable for pharmaceutical use as the chronic harms are lower.  Ethchlorvynol and tert-amyl alcohol are tertiary alcohols which have seen both medicinal and recreational use.
Other alcohols are substantially more poisonous than ethanol, partly because they take much longer to be metabolized and partly because their metabolism produces substances that are even more toxic. Methanol (wood alcohol), for instance, is oxidized to formaldehyde and then to the poisonous formic acid in the liver by alcohol dehydrogenase and formaldehyde dehydrogenase enzymes , respectively; accumulation of formic acid can lead to blindness or death.  Likewise, poisoning due to other alcohols such as ethylene glycol or diethylene glycol are due to their metabolites, which are also produced by alcohol dehydrogenase.  
An effective treatment to prevent toxicity after methanol or ethylene glycol ingestion is to administer ethanol. Alcohol dehydrogenase has a higher affinity for ethanol, thus preventing methanol from binding and acting as a substrate . Any remaining methanol will then have time to be excreted through the kidneys.   
Physical and chemical properties
Alcohols have an odor that is often described as "biting" and as "hanging" in the nasal passages. Ethanol has a slightly sweeter (or more fruit-like) odor than the other alcohols.
In general, the hydroxyl group makes the alcohol molecule polar . Those groups can form hydrogen bonds to one another and to other compounds (except in certain large molecules where the hydroxyl is protected by steric hindrance of adjacent groups  ). This hydrogen bonding means that alcohols can be used as protic solvents . Two opposing solubility trends in alcohols are: the tendency of the polar OH to promote solubility in water, and the tendency of the carbon chain to resist it. Thus, methanol, ethanol, and propanol are miscible in water because the hydroxyl group wins out over the short carbon chain. Butanol , with a four-carbon chain, is moderately soluble because of a balance between the two trends. Alcohols of five or more carbons such as pentanol and higher are effectively insoluble in water because of the hydrocarbon chain's dominance. All simple alcohols are miscible in organic solvents.
Because of hydrogen bonding , alcohols tend to have higher boiling points than comparable hydrocarbons and ethers . The boiling point of the alcohol ethanol is 78.29 °C, compared to 69 °C for the hydrocarbon hexane (a common constituent of gasoline ), and 34.6 °C for diethyl ether .
Alcohols, like water, can show either acidic or basic properties at the -OH group. With a pKa of around 16-19, they are, in general, slightly weaker acids than water , but they are still able to react with strong bases such as sodium hydride or reactive metals such as sodium . The salts that result are called alkoxides , with the general formula R O − M + .
Alcohols can be oxidised to give aldehydes , ketones or carboxylic acids , or they can be dehydrated to alkenes . They can react with carboxylic acids to form ester compounds , and they can (if activated first) undergo nucleophilic substitution reactions. The lone pairs of electrons on the oxygen of the hydroxyl group also makes alcohols nucleophiles . For more details, see the reactions of alcohols section below.
As one moves from primary to secondary to tertiary alcohols with the same backbone, the hydrogen bond strength, the boiling point, and the acidity typically decrease.
Occurrence in nature
Ziegler and oxo processes
- Al(C 2 H 5 ) 3 + 9 C 2 H 4 → Al(C 8 H 17 ) 3
- Al(C 8 H 17 ) 3 + 3 O + 3 H 2 O → 3 HOC 8 H 17 + Al(OH) 3
The process generates a range of alcohols that are separated by distillation .
- RCH=CH 2 + H 2 + CO → RCH 2 CH 2 CHO
- RCH 2 CH 2 CHO + 3 H 2 → RCH 2 CH 2 CH 2 OH
Such processes give fatty alcohols , which are useful for detergents.
Low molecular weight alcohols of industrial importance are produced by the addition of water to alkenes. Ethanol, isopropanol, 2-butanol, and tert-butanol are produced by this general method. Two implementations are employed, the direct and indirect methods. The direct method avoids the formation of stable intermediates, typically using acid catalysts. In the indirect method, the alkene is converted to the sulfate ester , which is subsequently hydrolyzed. The direct hydration using ethylene ( ethylene hydration ) or other alkenes from cracking of fractions of distilled crude oil .
Ethanol is obtained by fermentation using glucose produced from sugar from the hydrolysis of starch , in the presence of yeast and temperature of less than 37 °C to produce ethanol. For instance, such a process might proceed by the conversion of sucrose by the enzyme invertase into glucose and fructose , then the conversion of glucose by the enzyme complex zymase into ethanol (and carbon dioxide).
Several of the benign bacteria in the intestine use fermentation as a form of anaerobic metabolism . This metabolic reaction produces ethanol as a waste product, just like aerobic respiration produces carbon dioxide and water . Thus, human bodies contain some quantity of alcohol endogenously produced by these bacteria. In rare cases, this can be sufficient to cause " auto-brewery syndrome " in which intoxicating quantities of alcohol are produced.   
Primary alkyl halides react with aqueous NaOH or KOH mainly to primary alcohols in nucleophilic aliphatic substitution . (Secondary and especially tertiary alkyl halides will give the elimination (alkene) product instead). Grignard reagents react with carbonyl groups to secondary and tertiary alcohols. Related reactions are the Barbier reaction and the Nozaki-Hiyama reaction .
Aldehydes or ketones are reduced with sodium borohydride or lithium aluminium hydride (after an acidic workup). Another reduction by aluminiumisopropylates is the Meerwein-Ponndorf-Verley reduction . Noyori asymmetric hydrogenation is the asymmetric reduction of β-keto-esters.
Alkenes engage in an acid catalysed hydration reaction using concentrated sulfuric acid as a catalyst that gives usually secondary or tertiary alcohols. The hydroboration-oxidation and oxymercuration-reduction of alkenes are more reliable in organic synthesis. Alkenes react with NBS and water in halohydrin formation reaction . Amines can be converted to diazonium salts , which are then hydrolyzed.
The formation of a secondary alcohol via reduction and hydration is shown:
Alcohols behave as weak acids, undergoing deprotonation , but strong bases are required. The deprotonation reaction to produce an alkoxide salt is performed with a strong base such as sodium hydride or sodium metal.
- 2 R-OH + 2 NaH → 2 R-O − Na + + 2 H 2
- 2 R-OH + 2 Na → 2 R-O − Na + + H 2
- R-OH + NaOH ⇌ R-O − Na + + H 2 O (equilibrium to the left)
The OH group is not a good leaving group in nucleophilic substitution reactions, so neutral alcohols do not react in such reactions. However, if the oxygen is first protonated to give R−OH 2 + , the leaving group ( water ) is much more stable, and the nucleophilic substitution can take place. For instance, tertiary alcohols react with hydrochloric acid to produce tertiary alkyl halides , where the hydroxyl group is replaced by a chlorine atom by unimolecular nucleophilic substitution . If primary or secondary alcohols are to be reacted with hydrochloric acid , an activator such as zinc chloride is needed. In alternative fashion, the conversion may be performed directly using thionyl chloride . 
- 3 R-OH + PBr 3 → 3 RBr + H 3 PO 3
Alcohols are themselves nucleophilic, so R−OH 2 + can react with ROH to produce ethers and water in a dehydration reaction , although this reaction is rarely used except in the manufacture of diethyl ether .
More useful is the E1 elimination reaction of alcohols to produce alkenes . The reaction, in general, obeys Zaitsev's Rule , which states that the most stable (usually the most substituted) alkene is formed. Tertiary alcohols eliminate easily at just above room temperature, but primary alcohols require a higher temperature.
This is a diagram of acid catalysed dehydration of ethanol to produce ethene :
- R-OH + R'-COOH → R'-COOR + H 2 O
In order to drive the equilibrium to the right and produce a good yield of ester, water is usually removed, either by an excess of H 2 SO 4 or by using a Dean-Stark apparatus . Esters may also be prepared by reaction of the alcohol with an acid chloride in the presence of a base such as pyridine .
Primary alcohols (R-CH 2 -OH) can be oxidized either to aldehydes (R-CHO) or to carboxylic acids (R-CO 2 H), while the oxidation of secondary alcohols (R 1 R 2 CH-OH) normally terminates at the ketone (R 1 R 2 C=O) stage. Tertiary alcohols (R 1 R 2 R 3 C-OH) are resistant to oxidation.
The direct oxidation of primary alcohols to carboxylic acids normally proceeds via the corresponding aldehyde, which is transformed via an aldehyde hydrate (R-CH(OH) 2 ) by reaction with water before it can be further oxidized to the carboxylic acid.
Reagents useful for the transformation of primary alcohols to aldehydes are normally also suitable for the oxidation of secondary alcohols to ketones . These include Collins reagent and Dess-Martin periodinane . The direct oxidation of primary alcohols to carboxylic acids can be carried out using potassium permanganate or the Jones reagent .
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