Arielle Cruz
Alkenes are hydrocarbons with carbon-carbon double bonds, and they are named using similar rules to alkanes, except that the suffix becomes -ene. Alcohols, on the other hand, are compounds with a hydroxyl group (-OH) as the functional group and are named with the suffix -ol. When an alkene and an alcohol group are both present in a molecule, the naming convention becomes more complex. The priority of functional groups must be considered, with the higher priority group forming the suffix. The general convention is that alcohol takes precedence over the alkene group, resulting in a compound name ending in -enol. However, the specific naming convention can vary depending on the structure of the molecule, and the position of the double bond and hydroxyl group.
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What You'll Learn
- Alkenes with alcohol are called alkenols and the prefix is --enol
- Alcohol gets lowest priority over the alkene
- Alkene substituents are called alkenyl and the suffix is --enyl
- The longest carbon chain that includes the double bond is identified and numbered
- The name of the molecule is written according to IUPAC rules
Alkenes with alcohol are called alkenols and the prefix is --enol
Alkenes are hydrocarbons that contain carbon-carbon double bonds. They are named by dropping the '-ane' ending of the parent structure and adding '-ene'. The parent structure refers to the longest chain containing both carbon atoms of the double bond. Alcohols, on the other hand, are compounds with a hydroxyl group (OH) as the functional group and are typically named by adding the suffix '-ol'.
When an alkene and an alcohol group are both present in a molecule, the naming convention becomes slightly more complex. The molecule is named as follows: (location of the alkene)-(prefix for the parent chain + en)-(location of the hydroxyl group)-ol. For example, if the double bond is on C-4 and the OH group is on C-1, the IUPAC name of the compound would be Pent-4-en-1-ol.
In such cases, the hydroxyl group takes precedence over the double bond, and the prefix becomes '-enol'. This means that the alcohol gets the lowest priority over the alkene. For instance, if the OH group is on C-1 and the double bond is on C-2, the name would be But-2-en-1-ol.
It is important to note that the chain should be numbered so that the functional group gets the lowest number. The numbering of the substituents should be done in a way that the sum of the numbers assigned to them is the smallest possible. Additionally, when multiple alcohols are present, use 'di', 'tri', etc., before the 'ol', after the parent name. For example, 2,3-hexanediol.
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Alcohol gets lowest priority over the alkene
When it comes to naming alkenes with alcoholic groups, there are specific rules and conventions that need to be followed to ensure clear and consistent nomenclature. Alkenes are hydrocarbons that possess carbon-carbon double bonds, and they are given the suffix "-ene". On the other hand, alcohols are identified by the presence of a hydroxyl group (-OH) and are named using the suffix "-ol".
Now, when it comes to the priority of these functional groups in naming, it's important to understand the established hierarchy. According to IUPAC (the International Union of Pure and Applied Chemistry), the higher priority functional group forms the suffix of the compound's name. In the case of alkenes and alcohols, alcohol takes precedence over the alkene, meaning it gets the suffix position. This is because, alphabetically, 'ol' comes before 'ene'. So, for example, a compound with both an alkene and an alcoholic group would be named as "3-pentene-2-ol", with 'ol' representing the alcohol group taking the suffix position.
It's worth noting that the numbering of the compound is also important. The carbon chain is numbered in such a way that the functional group gets the lowest number. So, in the example "3-pentene-2-ol", the alcohol group is on carbon number 2, while the double bond of the alkene is on carbon number 3. This is because alcohol has a higher priority and therefore gets the lower number.
Additionally, when referring to stereoisomers, the cis and trans convention is used when there are only two non-hydrogen attachments to the alkene. If there are 3 or 4 non-hydrogen atoms attached, the E/Z system is used, with E (entgegen) and Z (zusammen) indicating the relative positions of the higher priority groups to the double bond.
In summary, when naming alkenes with alcoholic groups, alcohol gets the lowest number in the compound name, reflecting its higher priority, and the suffix "-ol" is used to indicate the presence of the alcoholic group.
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Alkene substituents are called alkenyl and the suffix is --enyl
Alkenes are hydrocarbons with carbon-carbon double bonds. The suffix '-ene' indicates an alkene or cycloalkene. The general rules for naming alkenes are similar to those for naming alkanes, except that the suffix '-ane' is replaced with '-ene'. For example, 'ethane' is an alkane with two carbon atoms, whereas 'ethene' is an alkene with two carbon atoms.
When naming an alkene, the longest carbon chain that contains the carbon-carbon double bond is chosen as the root name. If there are two chains of equal length that contain the double bond, the chain with more substituents is chosen. The carbon atoms in the parent chain are numbered so that the carbon with the double bond has the lowest possible number. The name of the parent chain is then determined based on the number of carbon atoms, with the suffix '-ene'. For example, a six-carbon chain with a double bond on the second carbon would be named 'hexene'.
Alkene substituents are called alkenyl, and the suffix is '-enyl'. For example, ethenyl is commonly known as vinyl, and 2-propenyl is known as allyl.
When an alkene contains an alcohol group, it is called an alkenol, and the prefix '-enol' is used. The alcohol group gets the lowest priority in naming, and the double bond is prioritised. For example, an alkene with a double bond on carbon 4 and an alcohol group on carbon 1 would be named 'pent-4-en-1-ol'.
If the double bond is not terminal and is located in the centre of the chain, the carbons are numbered so that the first of the two double-bonded carbons has the lowest number. This number precedes the '-ene' suffix with a dash. For example, an alkene with a double bond on the third carbon would be named '3-pentene'.
If there are multiple double bonds, they are all numbered in the name of the molecule, from lowest to highest, and separated by commas. The molecule is then named as a diene, triene, or an equivalent prefix indicating the number of double bonds.
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The longest carbon chain that includes the double bond is identified and numbered
When identifying and naming alkenes with an alcoholic group, the first step is to find the longest carbon chain that includes the carbon-carbon double bond group. This chain is considered the parent chain. If there are two equally long chains that include the double bond, choose the chain with the most substituents.
The next step is to number the carbon atoms in the parent chain. This should be done in such a way that the carbon atom with the double bond gets the lowest possible number. If the double bond is located in the center of the chain, the nearest substituent rule is used to determine the end where numbering starts. The smaller of the two numbers designating the carbon atoms of the double bond is used as the double bond locator.
If there is more than one double bond in the alkene, all of the bonds should be numbered in the name of the molecule, even if they are terminal double bonds. The numbers should be listed in increasing order and separated by commas.
After numbering the carbon chain, the name of the parent chain is determined based on the number of carbon atoms present and given the suffix "-ene".
Finally, the numbering for any substituents attached to the chain is assigned. The numbering should be done so that the sum of the numbers given to the substituents is as low as possible.
For example, let's consider an organic compound with five carbon atoms, which is the longest carbon chain possible in this molecule. The double bond is on C-4 and the hydroxyl group is on C-1. Following the above steps, the IUPAC name of the compound will be Pent-4-en-1-ol.
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The name of the molecule is written according to IUPAC rules
The International Union of Pure and Applied Chemistry (IUPAC) provides a set of rules for naming compounds with a C-C double bond and an alcohol attached to the C as the functional group. The name given to a compound according to the rules set by the IUPAC is called the IUPAC name or IUPAC nomenclature of the molecule.
To name an alkene with an alcoholic group attached to it, the following steps are to be followed:
Firstly, identify the longest chain possible, which includes the C=C group. If there are two possibilities, choose the chain with more substituents. Then, number the C in the parent chain in such a way that the carbon with the double bond gets the lowest possible number. The double bond location is before the parent name.
Next, identify the name of the parent chain with respect to the number of C present and add the suffix '-ene'. The suffix '-ene' indicates an alkene or cycloalkene. The name of the parent chain is used as the root word for the compound.
After this, give the numbering for the substituents attached. The numbering should be such that the sum of the numbers assigned for the substituents must be the lowest possible number. The location to which the -OH group is attached and any additional substituent groups locations within the chain are given a prefix number. The functional group gets precedence over the double bond, and the suffix '-ol' is given by removing the 'e' from '-ene'. The location to which the -OH group is attached must also be mentioned.
Finally, name the compound. For example, if the main chain is pentene, the double bond is on C-4, and the OH group is on C-1, the IUPAC name of the compound will be Pent-4-en-1-ol.
It is important to note that the functional groups with the least priority than the C=C group include halogens, alkynes, and -NO2. For representing the isomers of alkenes, the prefix cis and trans are commonly used. However, the IUPAC-accepted way of representing the isomers is by following the Cahn-Ingold-Prelog system.
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Frequently asked questions
Alkenes are hydrocarbons that have carbon-carbon double bond functional groups.
Compounds with the hydroxyl group (-OH) as the functional group are called alcohols.
First, identify the longest chain possible, which includes the carbon-carbon group. If there are two possibilities, choose the longest chain with more substituents. Then, number the carbons in the parent chain so that the carbon with the double bond has the lowest number. Name the substituents along with the assigned number in alphabetical order before naming the parent chain. The IUPAC name of the compound will be {name of the parent chain}-{numbering for the substituents attached}-en-{position of the -OH group}-ol.
The suffix for an alkene is -ene.
The suffix for an alcohol is -ol.
