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Chapter 7: Problem 1

Name each of the following using IUPAC nomenclature: Sample Solution (a) The longest continuous chain in this alkene contains four carbon atoms. The double bond is between C-2 and C-3, and so it is named as a derivative of 2 -butene. The two methyl groups are substituents attached to C-2 and C-3 of the main chain.

Short Answer

Expert verified
Name compound according to longest chain, double bond position, and substituents.

Step by step solution

01

Identify the Longest Carbon Chain

First, find the longest continuous carbon chain in the molecule. This chain will determine the base name of the compound. For alkenes, the chain must include the maximum number of double bonds and should be numbered to assign the lowest possible numbers to the double bond positions.
02

Locate the Double Bond

Identify the position of the double bond in the main carbon chain. Number the chain such that the double bond gets the lowest possible position number. Use the position number of the first carbon in the double bond to name the alkene.
03

Identify and Name the Substituents

Look for any side groups or substituents attached to the main carbon chain. Determine their positions and use the IUPAC prefixes to name these; for example, methyl, ethyl, etc. Number the position of each substituent along the carbon chain.
04

Assemble the IUPAC Name

Combine the name of the parent chain with the names and positions of the substituents. The substituents are listed in alphabetical order, each prefixed by its position number and separated by commas. The position of the double bond is indicated before the name of the longest carbon chain.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Longest Carbon Chain
When it comes to naming alkenes in the IUPAC system, the identification of the longest carbon chain is crucial. This chain forms the backbone of the compound's name. Here's how you go about it:
  • Look for the longest continuous sequence of carbon atoms. This ensures that the chain accurately includes the full structure of the alkene.
  • In the case of alkenes, the chain you select must contain the maximum number of double bonds. This is essential in ensuring that the correct hydrocarbon type is being named.
  • The priority is to make the double bonds occur at the lowest numbers possible when assigning positions, which we'll cover next.
Always remember, the longest carbon chain dictates the 'parent' part of the alkene's name.
Double Bond Position
Determining the position of the double bond is a pivotal step in naming alkenes. It plays a key role in the structure and name of the compound.
  • Number the carbon chain from the end nearest to the double bond. The goal here is to give the earliest possible position number to the double bond.
  • The position number is based on the first carbon that forms part of the double bond. This means if your double bond is between the second and third carbon atoms, its position is indicated as 2.
By properly identifying the position of the double bond, you can accurately name the structure of the alkene, ensuring clarity in chemical communication.
Substituent Identification
In addition to the main carbon chain and double bond, another important task is to identify any substituents or side groups. These additions affect the complete name.
  • Identify all additional groups that are not part of the longest carbon chain but are attached to it. These could be groups like methyl (-CH鈧�) or ethyl (-C鈧侶鈧�).
  • Assign each substituent a position number based on where they appear on the chain, using the numbering you鈥檝e already established for the main chain.
  • Substituents are named using standard prefixes depending on the number of carbon atoms they contain, like "methyl" for a single carbon substituent.
  • List substituents alphabetically in the full compound name, each prefixed by its position number and separated by commas.
Getting the hang of correctly identifying and naming substituents is vital for mastering IUPAC nomenclature of alkenes.

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Most popular questions from this chapter

In the acid-catalyzed dehydration of 2 -methyl-1-propanol, what carbocation would be formed if a hydride shift accompanied cleavage of the carbon-oxygen bond in the alkyloxonium ion? What ion would be formed as a result of a methyl shift? Which pathway do you think will predominate, a hydride shift or a methyl shift?

The following flow chart connects three of the reactions we have discussed that involve carbocation intermediates. Each arrow may represent more than one elementary step in a mechanism. Arrows 1 and 2 summarize the conversion of alcohols to alkyl halides, 3 and 4 the dehydrohalogenation of an alkyl halide to an alkene by the \(\mathrm{E} 1\) mechanism, and 1 and 4 the formation of an alkene by dehydration of an alcohol. The reaction indicated by arrow 5 constitutes a major focus of the next chapter. There we will explore reactions that give overall addition to the double bond by way of carbocation intermediates. One such process converts alkenes to alkyl halides \((5+2)\), another converts alkenes to alcohols (5 \(+6\) ). What term best describes the relationship between an alkene and a carbocation? A. Isomers B. Resonance contributors C. Alkene is conjugate acid of carbocation D. Alkene is conjugate base of carbocation

The following flow chart connects three of the reactions we have discussed that involve carbocation intermediates. Each arrow may represent more than one elementary step in a mechanism. Arrows 1 and 2 summarize the conversion of alcohols to alkyl halides, 3 and 4 the dehydrohalogenation of an alkyl halide to an alkene by the \(\mathrm{E} 1\) mechanism, and 1 and 4 the formation of an alkene by dehydration of an alcohol. The reaction indicated by arrow 5 constitutes a major focus of the next chapter. There we will explore reactions that give overall addition to the double bond by way of carbocation intermediates. One such process converts alkenes to alkyl halides \((5+2)\), another converts alkenes to alcohols (5 \(+6\) ). Based on the E1 mechanism for the conversion of a tertiary alkyl chloride to an alkene as summarized in arrows 3 and 4 , which arrow(s) represent(s) more than one elementary step? A. Arrow 3 B. Arrow 4 C. Both 3 and 4 D. Neither 3 nor 4

Choose the more stable alkene in each of the following pairs. Explain your reasoning. (a) 1-Methylcyclohexene or 3-methylcyclohexene (b) Isopropenylcyclopentane or allylcyclopentane (d) (Z)-Cyclononene or \((E)\) -cyclononene (e) (Z)-Cyclooctadecene or \((E)\) -cyclooctadecene

Write structural formulas for the six isomeric alkenes of molecular formula \(\mathrm{C}_{5} \mathrm{H}_{10}\) and arrange them in order of increasing stability (smaller heat of combustion, more negative \(\Delta \mathrm{H}_{f}^{\circ}\) )
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