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Chapter 22: Problem 28

Give the structure for each of the following. a. 4 -methyl-1-pentyne b. \(2,3,3\) -trimethyl- 1 -hexene c. 3 -ethyl- 4 -decene

Short Answer

Expert verified
The structures for the given compounds are as follows: a. 4 -methyl-1-pentyne: \[CH_3C-C\equiv C-CH(CH_3)-CH_3\] b. 2,3,3 -trimethyl- 1 -hexene: \[CH_2\equiv CH-CH(CH_3)-CH(CH_3)_2-CH_2-CH_3\] c. 3 -ethyl- 4 -decene: \[CH_3CH_2CH(CH_2CH_3)CH\equiv CHCH_2CH_2CH_2CH_3\]

Step by step solution

01

a. 4 -methyl-1-pentyne

1. Identify the parent chain: For this compound, the parent chain is "pentyne". The "pent" prefix indicates that there are five carbon atoms, while the "yne" suffix indicates that there is a carbon-carbon triple bond. 2. Determine the position of the triple bond: Since the parent chain name has '1-pentyne', the triple bond starts at the carbon-1 (i.e., the first carbon). 3. Add the methyl group: "4-methyl" indicates that there is a methyl group (a single carbon with three hydrogen atoms) attached to the carbon-4 (i.e., the fourth carbon). 4. Combine the components: The structure for 4-methyl-1-pentyne will look like this: \[CH_3C-C\equiv C-CH(CH_3)-CH_3\]
02

b. 2,3,3 -trimethyl- 1 -hexene

1. Identify the parent chain: The parent chain for this compound is "hexene". The "hex" prefix indicates that there are six carbon atoms, while the "ene" suffix indicates that there is a carbon-carbon double bond. 2. Determine the position of the double bond: Since the parent chain name has '1-hexene', the double bond starts at the carbon-1 (i.e., the first carbon). 3. Add the methyl groups: "2,3,3-trimethyl" indicates that there are three methyl groups attached to carbon-2 and carbon-3 (two methyl groups attached to carbon-3). 4. Combine the components: The structure for 2,3,3-trimethyl-1-hexene will look like this: \[CH_2\equiv CH-CH(CH_3)-CH(CH_3)_2-CH_2-CH_3\]
03

c. 3 -ethyl- 4 -decene

1. Identify the parent chain: The parent chain for this compound is "decene". The "dec" prefix indicates that there are ten carbon atoms, while the "ene" suffix indicates that there is a carbon-carbon double bond. 2. Determine the position of the double bond: From the name '4-decene', we can see that the double bond starts at the carbon-4 (i.e., the fourth carbon). 3. Add the ethyl group: "3-ethyl" indicates that there is an ethyl group (two carbons with five hydrogen atoms) attached to the carbon-3 (i.e., the third carbon). 4. Combine the components: The structure for 3-ethyl-4-decene will look like the following: \[CH_3CH_2CH(CH_2CH_3)CH\equiv CHCH_2CH_2CH_2CH_3\]

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Key Concepts

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

IUPAC Nomenclature
The IUPAC nomenclature system is a standardized method for naming organic chemical compounds. This approach ensures clear and precise communication across different regions and languages. The name of a compound gives insight into its structure and functional groups.
One of the vital principles of IUPAC nomenclature is identifying the **parent chain**, the longest sequence of carbon atoms. The chain typically determines the base name (like "pentane" or "hexene").
Let's go over some key rules of IUPAC naming:
  • **Identify the longest chain**: This is essential to find the base name (e.g., "pentyne" in 4-methyl-1-pentyne).
  • **Functional groups and indexes**: Examine double or triple bonds in the chain. Use numbers to show where these groups start on the parent chain.
  • **Substituents and prefixes**: Identify groups branching off the main chain (e.g., methyl or ethyl). Substituents are named with numbers based on their position.
  • **Priority and alphabetical order**: Substituents are arranged alphabetically in some cases, while the priority of functional groups might determine the numbering of the chain.
These guidelines ensure that complex organic molecules are communicated clearly, improving understanding and consistency.
Alkynes
Alkynes are a class of hydrocarbons containing at least one carbon-carbon triple bond (C鈮). The suffix "yne" indicates the presence of this bond, distinguishing alkynes from other hydrocarbons. Their general formula is \(C_nH_{2n-2}\).
Key properties of alkynes include:
  • **Triple bonds**: These bonds make alkynes more reactive than their single or double-bonded counterparts. The bond is composed of one sigma bond and two pi bonds.
  • **Geometry and Hybridization**: Alkynes typically exhibit a linear geometry around the triple bond because of the sp hybridization of the carbon atoms.
  • **Nomenclature**: In naming, it's crucial to number the chain to give the lowest possible numbers to the triple bond. The position of the triple bond directly affects the name (e.g., 1-pentyne).
These features make alkynes an essential category in organic chemistry, with valuable applications in chemical reactions like hydrogenation.
Alkenes
Alkenes contain at least one carbon-carbon double bond and are denoted with the "ene" suffix. The double bond offers distinctive properties and reactivity compared to single-bonded alkanes.
Consider these essential characteristics of alkenes:
  • **Double bonds**: They consist of one sigma bond and one pi bond, making alkenes more reactive than alkanes.
  • **Cis-Trans Isomerism**: This occurs due to the non-rotatable nature of the double bond, leading to different spatial arrangements of groups attached to double-bonded carbons.
  • **Naming and numbering**: When naming alkenes, the chain should be numbered to assign the lowest possible number to the double bond, such as in 1-hexene.
Dankly, alkenes play a crucial role in the chemical industry and synthesis, with applications ranging from polymers to pharmaceuticals.

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Most popular questions from this chapter

Part of a certain DNA sequence is \(\mathrm{G}-\mathrm{G}-\mathrm{T}-\mathrm{C}-\mathrm{T}-\mathrm{A}-\mathrm{T}-\mathrm{A}-\mathrm{C} .\) What is the complementary sequence?

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Which of the noncyclic isomers of bromochloropropene are optically active?
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