Ch.3 - Structure and Stereochemistry of Alkanes

Wade9th EditionOrganic ChemistryISBN: 9780135213728Not the one you use?Change textbook

Wade 9th Edition

Ch.3 - Structure and Stereochemistry of Alkanes

Problem 26c,d

Chapter 3, Problem 26c,d

Name the following compounds. Remember that two up bonds are cis; two down bonds are cis; one up bond and one down bond are trans.
(c)
(d)

Verified step by step guidance

Step 1: Identify the cyclohexane ring in both compounds (c) and (d). Cyclohexane is a six-membered ring, which is the base structure for these compounds.

Step 2: Determine the substituents attached to the cyclohexane ring. In compound (c), there are two methyl groups (CH₃) attached. In compound (d), there are also two methyl groups attached.

Step 3: Analyze the orientation of the substituents. In compound (c), both methyl groups are on the same side of the ring, indicating a cis configuration. In compound (d), the methyl groups are on opposite sides of the ring, indicating a trans configuration.

Step 4: Name the compounds based on the substituents and their orientation. For compound (c), the name will include 'cis' to indicate the configuration, and for compound (d), the name will include 'trans'.

Step 5: Combine the information to form the complete names. For compound (c), it will be 'cis-1,2-dimethylcyclohexane', and for compound (d), it will be 'trans-1,4-dimethylcyclohexane'.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Cis-Trans Isomerism

Cis-trans isomerism is a type of stereoisomerism where the spatial arrangement of groups around a double bond or a ring structure differs. In cis isomers, similar groups are on the same side, while in trans isomers, they are on opposite sides. This concept is crucial for understanding the geometric configuration of organic compounds, which can significantly affect their physical and chemical properties.

Nomenclature of Organic Compounds

The nomenclature of organic compounds follows specific rules set by the International Union of Pure and Applied Chemistry (IUPAC). This includes identifying the longest carbon chain, naming substituents, and determining the correct prefixes and suffixes based on functional groups. Proper nomenclature is essential for clear communication in chemistry, allowing chemists to convey the structure and composition of compounds accurately.

Structural Representation of Molecules

Structural representation of molecules involves depicting the arrangement of atoms within a compound, including bonds and functional groups. Common representations include Lewis structures, condensed formulas, and skeletal formulas. Understanding these representations is vital for visualizing molecular geometry and predicting reactivity, which is particularly important when analyzing isomers and their properties.

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Related Practice

Textbook Question

Use your results from Problem 3-27 to complete the following table. Each entry shows the positions of two groups arranged as shown. For example, two groups that are trans on adjacent carbons (trans-1,2) must be both equatorial (e,e) or both axial (a,a).

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Textbook Question

a. Draw both chair conformations of cis-1,4-dimethylcyclohexane, and determine which conformer is more stable.

b. Repeat for the trans isomer.

c. Predict which isomer (cis or trans) is more stable.

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Textbook Question

Name the following compounds. Remember that two up bonds are cis; two down bonds are cis; one up bond and one down bond are trans.

(e)

(f)