Lena Savoie
Benzene, a cyclic ring-structured compound, can be manipulated to form alcohol groups through various methods. One approach involves attaching an -OH group to a phenyl group, resulting in phenol, a benzene-derived compound. Another method involves the reduction of carboxyl groups to alcohol, forming hydroxymethyl. Additionally, benzene rings can undergo reactions with diols to produce cyclic acetals. The nomenclature for benzene derivatives can be complex, with compounds often having multiple names, including systematic and traditional names. For example, benzene-1,2-diol is the systematic name for pyrocatechol. This guide will explore the processes and naming conventions associated with forming two alcohol groups on benzene.
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What You'll Learn
- Phenol is a benzene-derived compound with an -OH group attached to a phenyl group
- Benzyl alcohol is formed by adding an OH group to a benzyl group
- Benzene rings are the main part of the molecule, not a functional group
- Acetals are formed by reacting with two equivalents of alcohol
- Alcohols can be added to carbonyl groups
Phenol is a benzene-derived compound with an -OH group attached to a phenyl group
Benzene derivatives are organic compounds that can have multiple names, making their nomenclature confusing. Phenol is one such benzene-derived compound with the formula C6H5OH. It is formed by attaching a hydroxyl (-OH) group to a phenyl group. The phenyl group itself is derived from benzene by removing a hydrogen atom from the benzene ring. This process of removing a hydrogen atom from benzene is also known as chlorination of benzene, where benzene reacts with chlorine gas to form chlorobenzene and hydrochloric acid. The chemical equation for this process is C6H6 + Cl2 → C6H5Cl + HCl.
Phenol has a variety of names, including monohydroxybenzene, benzenol, and carbolic acid. It is a highly reactive compound that can undergo oxidation to produce different types of products. For example, chromic acid oxidizes phenol to form a compound called quinone. Phenol is also used as a disinfectant in household cleaners and mouthwash due to its antiseptic properties. Additionally, it may have been the first surgical antiseptic.
The presence of the hydroxyl group in phenol makes it more reactive than benzene. This hydroxyl group can activate the aromatic ring, making it more susceptible to electrophilic aromatic substitution. Phenol is also used as an intermediate in industrial synthesis. One method of producing phenol industrially is by treating benzene with propylene and an acidic catalyst to form isopropylbenzene (cumene). Through oxidation and acid-catalyzed rearrangement, cumene can yield phenol and acetone as valuable industrial products.
Phenol is a toxic compound, even in small doses, and it can be harmful to the body. It is important to distinguish between pure phenyl groups and household "liquid phenyl" cleaners, which may contain phenol or other aromatic disinfectant compounds but lack the pure phenyl group. Phenol has a distinct aromatic odour and is only slightly soluble in water. Its boiling point is approximately 232.2°C for phenyl derivatives.
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Benzyl alcohol is formed by adding an OH group to a benzyl group
The benzyl group is formed by manipulating the benzene ring. Specifically, it is formed by taking the phenyl group and adding a CH2 group to where the hydrogen was removed. Its molecular fragment can be written as C6H5CH2-R, PhCH2-R, or Bn-R.
The nomenclature of benzyl group-based compounds is very similar to phenyl group compounds. For example, a chlorine attached to a benzyl group is called benzyl chloride, whereas an OH group attached to a benzyl group is called benzyl alcohol.
Phenol is another example of a benzene-derived compound that contains an OH group. It is formed by attaching an OH group to a phenyl group. Phenol is distinct from aliphatic alcohols in terms of the pKa of the OH group, and it is generally considered a distinct functional group from an alcohol.
The presence of the OH group in benzyl alcohol and phenol can be detected through experimentation. For example, a scientist can determine the presence of an OH group by identifying a cyclic ring in the compound's structure.
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Benzene rings are the main part of the molecule, not a functional group
Benzene rings are a core part of a molecule, not a functional group. While functional groups can be transformed, benzene rings are the backbone of a molecule.
The benzene ring is a conjugation system with a specific molecular formula: C6H6. It is a parent molecule that can be manipulated to form other compounds. For example, the phenyl group is formed by removing a hydrogen atom from benzene and attaching a substituent to the site of the removed hydrogen atom. This compound is named by adding "phenyl" to the substituent, so a chlorine attached to a phenyl group would be named "phenyl chloride".
Benzene rings are also distinct from functional groups because they are aromatic rings. Aromatic compounds are so-called because they release a sweet aroma. The structure of benzene is made up of three C=C double bonds that alternate with single bonds. This structure is entirely different from alkenes.
The functional group containing an aromatic hydrocarbon is called an "arene". While benzene is not considered a functional group, it can be a part of a functional group. For example, the OH group attached to a benzene ring is called "phenol", which encompasses both the alcohol and the arene functional groups.
In summary, benzene rings are the central structure from which other compounds are formed, and they have distinct structural and chemical properties that differentiate them from functional groups.
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Acetals are formed by reacting with two equivalents of alcohol
In organic chemistry, acetals are functional groups with the connectivity R2C(OR')2. The R groups can be organic fragments or hydrogen, while the R' groups must be organic fragments, not hydrogen. The two R' groups can be equivalent to each other (a "symmetric acetal") or not (a "mixed acetal").
The formation of an acetal occurs when the hydroxyl group of a hemiacetal becomes protonated and is lost as water. The resulting carbocation is then rapidly attacked by a molecule of alcohol. Loss of the proton from the attached alcohol gives the acetal. Acetals are stable compared to hemiacetals, but their formation is a reversible equilibrium, as with esters.
Acetals can be converted back to the starting aldehyde/ketone with aqueous acid (H3O+). Thiols can be used in place of alcohols to make thioacetals. The most common reaction of thioacetals is their reduction with Raney nickel to give the corresponding alkanes.
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Alcohols can be added to carbonyl groups
Alcohols are commonly formed by the reduction of carbonyl compounds. This involves the addition of a nucleophilic hydride ion to the positively polarized carbon atom of the carbonyl group. The most common reducing agents used for this process are sodium borohydride (NaBH4) and lithium aluminum hydride (LiAlH4).
Sodium borohydride is typically chosen for laboratory reductions of aldehydes and ketones due to its safety, ease of handling, and ability to be used in water or alcohol solutions. It is a white, crystalline solid that can be weighed in the open atmosphere. However, it exhibits lower reactivity and is not suitable for reducing carboxylic acids or esters.
Lithium aluminum hydride, on the other hand, is a more reactive and stronger reducing agent. It can reduce a wide range of carbonyl compounds, including carboxylic acids, esters, aldehydes, and ketones. LiAlH4 is used for the reduction of carboxylic acids and esters, which NaBH4 cannot accomplish. However, it is more dangerous and highly reactive towards protic solvents like water, reacting violently and requiring the use of anhydrous diethyl ether as a solvent.
The reduction of aldehydes yields primary alcohols, while the reduction of ketones results in secondary alcohols. In the case of carboxylic acid and ester reductions with LiAlH4, two hydrogens become bonded to the former carbonyl carbon, leading to the formation of primary alcohols.
The Grignard reaction is another method for obtaining alcohols by reacting Grignard reagents with carbonyl compounds. This reaction involves two steps: the nucleophilic attack of the carbonyl carbon by the reagent's carbon, followed by protonation of the resulting oxide to produce the alcohol product.
In the context of benzene, an aromatic compound, the addition of two alcohol groups can be achieved by manipulating the benzene ring. This involves forming a phenyl group by removing a hydrogen from benzene and then attaching an -OH group to create phenol or benzyl alcohol. The compound formed by adding two alcohol groups to benzene is known as benzene-1,2-diol, with the traditional name "pyrocatechol."
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Frequently asked questions
Benzene is an organic compound with a six-carbon ring structure.
An alcohol group is formed by attaching an -OH group to a benzene ring. This compound is called phenol.
The IUPAC name for benzene with two alcohol groups is benzene-1,2-diol.
Some common names for benzene with two alcohol groups include pyrocatechol, hydroxyquinol, phloroglucinol, and pyrogallol.
