Alcohol
In chemistry, alcohol is an organic compound that carries at least one hydroxyl functional group bound to a saturated carbon atom. The term alcohol originally referred to the primary alcohol ethanol, which is used as a drug and is the main alcohol present in alcoholic beverages. An important class of alcohols, of which methanol and ethanol are the simplest members, includes all compounds for which the general formula is CHOH. Simple monoalcohols that are the subject of this article include primary, secondary and tertiary alcohols.
The suffix -ol appears in the IUPAC chemical name of all substances where the hydroxyl group is the functional group with the highest priority. When a higher priority group is present in the compound, the prefix hydroxy- is used in its IUPAC name. The suffix -ol in non-IUPAC names also typically indicates that the substance is an alcohol. However, many substances that contain hydroxyl functional groups have names which include neither the suffix -ol, nor the prefix hydroxy-.
History
possibly originated in the Indus valley civilization as early as 2000 BCE. The people of India used an alcoholic drink called Sura made from fermented rice, barley, jaggery, and flowers of the madhyaka tree. Alcohol distillation was known to Islamic chemists as early as the eighth century.The Arab chemist, al-Kindi, unambiguously described the distillation of wine in a treatise titled as "The Book of the chemistry of Perfume and Distillations".
Nomenclature
Etymology
The word "alcohol" is from the Arabic kohl, a powder used as an eyeliner. Al- is the Arabic definite article, equivalent to the in English. Alcohol was originally used for the very fine powder produced by the sublimation of the natural mineral stibnite to form antimony trisulfide. It was considered to be the essence or "spirit" of this mineral. 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" authors for "fine powder." Vigo wrote: "the barbarous auctours use alcohol, or 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 refers to "vini alcohol vel vinum alcalisatum". Johnson 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" in the 18th century and was extended to the class of substances so-called as "alcohols" in modern chemistry after 1850.
The term ethanol was invented in 1892, combining the word ethane with the "-ol" ending of "alcohol".
Systematic names
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 naming simple alcohols, the name of the alkane chain loses the terminal e and adds the suffix -ol, e.g., as in "ethanol" from the alkane chain name "ethane". When necessary, the position of the hydroxyl group is indicated by a number between the alkane name and the -ol: propan-1-ol for, propan-2-ol for. If a higher priority group is present, then the prefix hydroxy-is used, e.g., as in 1-hydroxy-2-propanone.| CH–CH–CH–OH | ||||
| n-propyl alcohol, propan-1-ol, or 1-propanol | isopropyl alcohol, propan-2-ol, or 2-propanol | cyclohexanol | isobutyl alcohol, 2-methylpropan-1-ol, or 2-methyl-1-propanol | tert-amyl alcohol, 2-methylbutan-2-ol, or 2-methyl-2-butanol |
| A primary alcohol | A secondary alcohol | A secondary alcohol | A primary alcohol | A tertiary alcohol |
In cases where the OH functional group is bonded to an sp2 carbon on an aromatic ring the molecule is known as a phenol, and is named using the IUPAC rules for naming phenols.
Common names
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, and tertiary, based upon the number of carbon atoms connected to the carbon atom that bears the hydroxyl functional group. The primary alcohols have general formulas RCHOH. The simplest primary alcohol is methanol, for which R=H, and the next is ethanol, for which R=CH, the methyl group. Secondary alcohols are those of the form RR'CHOH, the simplest of which is 2-propanol. For the tertiary alcohols the general form is RR'R"COH. The simplest example is tert-butanol, for which each of R, R', and R" is CH. In these shorthands, R, R', and R" represent substituents, alkyl or other attached, generally organic groups.
In archaic nomenclature, alcohols can be named as derivatives of methanol using "-carbinol" as the ending. For instance, COH can be named trimethylcarbinol.
| Type | Formula | IUPAC Name | Common name |
| Monohydric alcohols | CHOH | Methanol | Wood alcohol |
| Monohydric alcohols | CHOH | Ethanol | Alcohol |
| Monohydric alcohols | CHOH | Propan-2-ol | Isopropyl alcohol, Rubbing alcohol |
| Monohydric alcohols | CHOH | Butan-1-ol | Butanol, Butyl alcohol |
| Monohydric alcohols | CHOH | Pentan-1-ol | Pentanol, Amyl alcohol |
| Monohydric alcohols | CHOH | Hexadecan-1-ol | Cetyl alcohol |
| Polyhydric alcohols | CH | Ethane-1,2-diol | Ethylene glycol |
| Polyhydric alcohols | CH | Propane-1,2-diol | Propylene glycol |
| Polyhydric alcohols | CH | Propane-1,2,3-triol | Glycerol |
| Polyhydric alcohols | CH | Butane-1,2,3,4-tetraol | Erythritol, Threitol |
| Polyhydric alcohols | CH | Pentane-1,2,3,4,5-pentol | Xylitol |
| Polyhydric alcohols | CH | hexane-1,2,3,4,5,6-hexol | Mannitol, Sorbitol |
| Polyhydric alcohols | CH | Heptane-1,2,3,4,5,6,7-heptol | Volemitol |
| Unsaturated aliphatic alcohols | CHOH | Prop-2-ene-1-ol | Allyl alcohol |
| Unsaturated aliphatic alcohols | CHOH | 3,7-Dimethylocta-2,6-dien-1-ol | Geraniol |
| Unsaturated aliphatic alcohols | CHOH | Prop-2-yn-1-ol | Propargyl alcohol |
| Alicyclic alcohols | CH | Cyclohexane-1,2,3,4,5,6-hexol | Inositol |
| Alicyclic alcohols | CHOH | 5-Methyl-2-cyclohexan-1-ol | Menthol |
Applications
Alcohols have a long history of myriad uses. For simple mono-alcohols, which is the focus on this article, the following are most important industrial alcohols:- methanol, mainly for the production of formaldehyde and as a fuel additive
- ethanol, mainly for alcoholic beverages, fuel additive, solvent
- 1-propanol, 1-butanol, and isobutyl alcohol for use as a solvent and precursor to solvents
- C6–C11 alcohols used for plasticizers, e.g. in polyvinylchloride
- fatty alcohol, precursors to detergents
Toxicity
With respect to acute toxicity, simple alcohols have low acute toxicities. Doses of several milliliters are tolerated. For pentanols, hexanols, octanols and longer alcohols, LD50 range from 2–5 g/kg. Methanol and ethanol are less acutely toxic. All alcohols are mild skin irritants.The metabolism of methanol is affected by the presence of ethanol, which has a higher affinity for liver alcohol dehydrogenase. In this way methanol will be excreted intact in urine.
Physical properties
In general, the hydroxyl group makes alcohols polar. Those groups can form hydrogen bonds to one another and to most other compounds. Owing to the presence of the polar OH alcohols are more water-soluble than simple hydrocarbons. Methanol, ethanol, and propanol are miscible in water. Butanol, with a four-carbon chain, is moderately soluble.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, and 34.6 °C for diethyl ether.
Occurrence in nature
Simple alcohols are found widely in nature. Ethanol is most prominent because it is the product of fermentation, a major energy-producing pathway. The other simple alcohols are formed in only trace amounts. More complex alcohols are pervasive, as manifested in sugars, some amino acids, and fatty acids.Production
Ziegler and oxo processes
In the Ziegler process, linear alcohols are produced from ethylene and triethylaluminium followed by oxidation and hydrolysis. An idealized synthesis of 1-octanol is shown:The process generates a range of alcohols that are separated by distillation.
Many higher alcohols are produced by hydroformylation of alkenes followed by hydrogenation. When applied to a terminal alkene, as is common, one typically obtains a linear alcohol:
Such processes give fatty alcohols, which are useful for detergents.
Hydration reactions
Some 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 or other alkenes from cracking of fractions of distilled crude oil.Hydration is also used industrially to produce the diol ethylene glycol from ethylene oxide.
Biological routes
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.Several species of the benign bacteria in the intestine use fermentation as a form of anaerobic metabolism. This metabolic reaction produces ethanol as a waste product. 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.
Like ethanol, butanol can be produced by fermentation processes. Saccharomyces yeast are known to produce these higher alcohols at temperatures above. The bacterium Clostridium acetobutylicum can feed on cellulose to produce butanol on an industrial scale.
Substitution
Primary alkyl halides react with aqueous NaOH or KOH mainly to primary alcohols in nucleophilic aliphatic substitution.. Grignard reagents react with carbonyl groups to secondary and tertiary alcohols. Related reactions are the Barbier reaction and the Nozaki-Hiyama reaction.Reduction
or ketones are reduced with sodium borohydride or lithium aluminium hydride. Another reduction by aluminiumisopropylates is the Meerwein-Ponndorf-Verley reduction. Noyori asymmetric hydrogenation is the asymmetric reduction of β-keto-esters.Hydrolysis
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:
Reactions
Deprotonation
With a pK of around 16–19, they are, in general, slightly weaker acids than water. With strong bases such as sodium hydride or sodium they form salts called alkoxides, with the general formula RO− M+.The acidity of alcohols is strongly affected by solvation. In the gas phase, alcohols are more acidic than in water.
Nucleophilic substitution
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+, the leaving group 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.Alcohols may, likewise, be converted to alkyl bromides using hydrobromic acid or phosphorus tribromide, for example:
In the Barton-McCombie deoxygenation an alcohol is deoxygenated to an alkane with tributyltin hydride or a trimethylborane-water complex in a radical substitution reaction.
Dehydration
Meanwhile, the oxygen atom has lone pairs of nonbonded electrons that render it weakly basic in the presence of strong acids such as sulfuric acid. For example, with methanol:Upon treatment with strong acids, alcohols undergo the E1 elimination reaction to produce alkenes. The reaction, in general, obeys Zaitsev's Rule, which states that the most stable 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 ethylene:
A more controlled elimination reaction requires the formation of the xanthate ester.
Protonolysis
Tertiary alcohols react with strong acids to generate carbocations. The reaction is related to their dehydration, e.g. isobutylene from tert-butyl alcohol. A special kind of dehydration reaction involves triphenylmethanol and especially its amine-substituted derivatives. When treated with acid, these alcohols lose water to give stable carbocations, which are commercial dyes.by protonolysis of the tertiary alcohol.
Esterification
Alcohol and carboxylic acids react in the so-called Fischer esterification. The reaction usually requires a catalyst, such as concentrated sulfuric acid:Other types of ester are prepared in a similar manner for example, tosyl esters are made by reaction of the alcohol with p-toluenesulfonyl chloride in pyridine.
Oxidation
Primary alcohols can be oxidized either to aldehydes or to carboxylic acids. The oxidation of secondary alcohols normally terminates at the ketone stage. Tertiary alcohols 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 by reaction with water before it can be further oxidized to the carboxylic acid.
via aldehydes and aldehyde hydrates
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.