Mason Delacroix
1-Decanol is a straight-chain fatty alcohol with ten carbon atoms and the molecular formula C10H21OH. It is a colourless to light yellow viscous liquid with an aromatic odour. 1-Decanol is used in the manufacture of plasticizers, lubricants, surfactants, and solvents. Its ability to permeate the skin has led to investigations into its potential as a penetration enhancer for transdermal drug delivery. In this article, we will explore the chemical structure of 1-decanol and determine whether it is classified as a primary, secondary, or tertiary alcohol.
| Characteristics | Values |
|---|---|
| Type of Alcohol | Primary |
| Molecular Formula | C10H21OH |
| State | Colorless to light yellow viscous liquid |
| Solubility in Water | Insoluble |
| Odor | Aromatic |
| Interfacial Tension Against Water at 20 °C | 8.97 mN/m |
| Preparation | Hydrogenation of decanoic acid |
| Preparation | Synthetic via the Ziegler process |
| Uses | Manufacture of plasticizers, lubricants, surfactants, and solvents |
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What You'll Learn
1-Decanol is a primary alcohol
The key characteristic of a primary alcohol is that the carbon atom with the OH group is attached to only one other carbon atom. Its general formula is RCH2OH. In contrast, a secondary alcohol has the OH group attached to two other carbon atoms, while a tertiary alcohol has the OH group attached to three other carbon atoms.
Decanol can be prepared by the hydrogenation of decanoic acid, which occurs naturally in coconut oil (about 10%) and palm kernel oil (about 4%). It can also be produced synthetically through the Ziegler process. It has various industrial applications, including the manufacture of plasticizers, lubricants, surfactants, and solvents.
The ability of 1-decanol to permeate the skin has led to its investigation as a penetration enhancer for transdermal drug delivery. However, like other medium-chain fatty alcohols, its skin permeation can cause irritation.
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IUPAC nomenclature for alcohols
The International Union of Pure and Applied Chemistry (IUPAC) has a set of rules for naming alcohols. Alcohols are organic compounds with a hydroxyl (OH) functional group on an aliphatic carbon atom. The general formula for an alcohol is ROH, where R is an alkyl group.
The first step in naming an alcohol is to identify the longest continuous chain (LCC) of carbon atoms containing the OH group. This LCC is the parent compound, and the alcohol takes its name from the corresponding alkane with the same number of carbon atoms. For example, an alcohol with six carbon atoms in its LCC is named using the alkane hexane as its parent compound. The chain is then numbered from the end closest to the OH group, with the number indicating the position of the OH group prefixed to the name of the parent hydrocarbon.
The -e ending of the parent alkane is replaced by the suffix -ol, which indicates the presence of an alcohol. For example, the alcohol derived from hexane would be named hexan-1-ol, with the 1 indicating that the OH group is attached to the first carbon atom in the chain. If there are multiple OH groups in the molecule, suffixes such as -diol or -triol are used, such as in the compound propane-1,2,3-triol.
When naming a cyclic structure with a hydroxyl group, the -OH group is assumed to be on the first carbon atom, and the number 1 is not included in the name. For example, the compound 6-methylcyclohexanol has a hydroxyl group attached to the sixth carbon atom of a cyclohexane ring.
Some simple alcohols have common names, such as ethylene glycol or glycerol, and some have trivial names, such as benzyl alcohol or tert-butyl alcohol. However, the IUPAC system provides a consistent and systematic approach to naming alcohols, ensuring clarity and precision in chemical communication.
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How to identify primary, secondary, and tertiary alcohols
Alcohols are organic compounds that are commonly found in everyday life. They are organic molecules with one or more hydroxyl groups (OH) attached to one or more carbon atoms in a hydrocarbon chain. Alcohols can be classified into three types: primary, secondary, and tertiary alcohols.
Primary Alcohols
A primary alcohol has a carbon atom of the hydroxyl group (OH) attached to only one single alkyl group. In other words, only one carbon atom is attached to the alpha-carbon. This occurs when the hydroxyl group is at the end of the molecule chain. Examples of primary alcohols include methanol, propanol, ethanol, butanol, and 1-decanol.
Secondary Alcohols
Secondary alcohols have a carbon atom of the hydroxyl group attached to two alkyl groups on either side. The two alkyl groups may be structurally identical or different. Additionally, a secondary alcohol has only one hydrogen atom attached to the hydroxyl group (-OH). This can occur anywhere along a carbon chain.
Tertiary Alcohols
Tertiary alcohols have a hydroxyl group attached to a carbon atom with no hydrogen atoms attached. This usually indicates that the hydroxyl group is attached to the same carbon atom as the branch. Tertiary alcohols have three R groups, while primary and secondary alcohols have one and two R groups, respectively.
Identification Techniques
Several tests can be used to identify the type of alcohol, including the Jones Test, Oxidation Test, Ferric Chloride Test, and Lucas Test. The Jones Test differentiates primary and secondary alcohols from tertiary alcohols, as tertiary alcohols do not react with chromium. The Ferric Chloride Test distinguishes between aliphatic and aromatic alcohols, as the solution turns purple in the presence of an aromatic alcohol. The Lucas Test uses zinc(II) chloride and hydrochloric acid as reagents, and the reaction rate depends on the formation of a carbocation.
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Uses of 1-decanol
1-decanol, also known as decyl alcohol, is a straight-chain fatty alcohol with ten carbon atoms. It is a colourless to light yellow viscous liquid with an aromatic odour. It is insoluble in water.
Due to its ability to permeate the skin, 1-decanol has been investigated as a penetration enhancer for transdermal drug delivery. It is also used in the production of lubricants, surfactants, plasticizers, and solvents. In addition, 1-decanol has been used in the cosmetic industry in cosmetics, daily flavours, and food flavours.
In terms of its chemical applications, 1-decanol has been used to study the thermal properties of polymeric monolithic stationary phases and to enhance homopolyglycine acceptor function. It is also used in the manufacture of ionic liquids, where it is soluble, and in the creation of DES (deep eutectic solvents) by mixing with other long-chain fatty acids, QAS, and fatty alcohols.
Furthermore, 1-decanol is used as a read-across analog for reproductive toxicity studies due to its structural similarity to certain target substances. It is also employed as a biochemical assay reagent and inhibitor in research involving human cytokines and mouse cell lines.
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Preparation of 1-decanol
1-decanol, also known as decyl alcohol or capric alcohol, is a straight-chain fatty alcohol with ten carbon atoms and the molecular formula C10H21OH. It is a colourless to light yellow viscous liquid with an aromatic or sweet floral odour resembling orange flowers. It has a slight, characteristic fatty taste and is insoluble in water.
1-decanol is used in the production of lubricants, surfactants, plasticizers, and solvents. It is also used in cosmetics, daily and food flavours, and in the perfume industry. In addition, 1-decanol has been used to study the thermal properties of polymeric monolithic stationary phases and to enhance homopolyglycine acceptor function.
Hydrogenation of Decanoic Acid
Decanoic acid, which is present in modest quantities in coconut oil (about 10%) and palm kernel oil (about 4%), can be hydrogenated to produce 1-decanol. This process involves the addition of hydrogen to the decanoic acid molecule, reducing the double bonds and converting the carboxylic acid group (-COOH) to an alcohol group (-OH). The reaction can be catalysed by various metals, such as nickel or platinum, under controlled temperature and pressure conditions.
The Ziegler Process
1-decanol can also be produced synthetically through the Ziegler process. This process involves the oligomerization of ethylene using alkyl aluminium compounds as catalysts. The reaction occurs in a solvent, typically at high pressures and temperatures. The resulting product is a mixture of alpha-olefins, which can then be hydrogenated to form 1-decanol.
Other Potential Methods
While not specifically mentioned for the preparation of 1-decanol, there may be alternative synthetic routes utilising different chemical reactions. These could include the reduction of aldehydes or ketones, the hydroboration-oxidation reaction, or the hydrolysis of alkyl halides. However, the feasibility and efficiency of these methods in the specific context of 1-decanol synthesis would need to be assessed.
It is important to note that 1-decanol can cause skin and eye irritation, and proper safety precautions should be taken during its preparation and handling.
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Frequently asked questions
1-Decanol is a straight-chain fatty alcohol with ten carbon atoms and the molecular formula C10H21OH.
The molecular formula of 1-decanol indicates that it is a primary alcohol. This is because the carbon atom with the OH group is attached to one other carbon atom.
A primary alcohol is a compound with an OH group on a carbon atom that is attached to only one other carbon atom.
The general formula of a primary alcohol is RCH2OH.
Some examples of primary alcohols include ethanol, 1-butanol, 1-hexanol, 1-octanol, and 1-decanol.
