Textbook Question
Convert each Newman projection to the equivalent line–angle formula, and assign the IUPAC name.
(c)
(d)
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Ch.3 - Structure and Stereochemistry of Alkanes
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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Table of contents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
Chapter 3, Problem 48g,h
Convert each Newman projection to the equivalent line–angle formula, and assign the IUPAC name. g.
(g) 
(h) 
Verified step by step guidance1
Step 1: Analyze the Newman projection for structure (g). The front carbon (closest to the viewer) has three substituents: two hydrogens and one fluorine. The back carbon (farthest from the viewer) has three substituents: three fluorine atoms and a CBr3 group.
Step 2: Convert the Newman projection of structure (g) into a line-angle formula. The front carbon is bonded to two hydrogens and one fluorine, while the back carbon is bonded to three fluorine atoms and a CBr3 group. Arrange these substituents in a tetrahedral geometry around each carbon.
Step 3: Assign the IUPAC name for structure (g). Identify the longest carbon chain and prioritize substituents based on IUPAC rules. The CBr3 group is a trihalogenated substituent, and fluorine atoms are halogen substituents.
Step 4: Analyze the Newman projection for structure (h). The front carbon has three substituents: two hydrogens and one fluorine. The back carbon has three substituents: one ethyl group (CH2CH3), one bromine atom, and one chlorine atom.
Step 5: Convert the Newman projection of structure (h) into a line-angle formula. The front carbon is bonded to two hydrogens and one fluorine, while the back carbon is bonded to an ethyl group, a bromine atom, and a chlorine atom. Assign the IUPAC name by identifying the longest chain and prioritizing substituents based on IUPAC rules.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Newman Projections
Newman projections are a way to visualize the conformation of a molecule by looking straight down the bond connecting two carbon atoms. This representation helps in understanding the spatial arrangement of substituents around the bond, which is crucial for analyzing steric interactions and torsional strain in organic compounds.
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Introduction to Drawing Newman Projections
Line-Angle Formulas
Line-angle formulas, also known as skeletal structures, are a simplified way to represent organic molecules. In this format, vertices represent carbon atoms, and lines represent bonds, with hydrogen atoms typically omitted for clarity. This method allows for quick visualization of molecular structure and connectivity, making it easier to identify functional groups and overall molecular geometry.
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IUPAC Nomenclature
IUPAC nomenclature is a systematic method for naming organic chemical compounds. It provides rules for naming based on the structure of the molecule, including the longest carbon chain, functional groups, and substituents. Understanding these rules is essential for accurately identifying and communicating the identity of organic compounds, especially when converting between different structural representations.
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Related Practice
Textbook Question
Conformational studies on ethane-1,2-diol (HOCH2–CH2OH) have shown the most stable conformation about the central C―C bond to be the gauche conformation, which is 9.6 kJ/mol (2.3 kcal/mol) more stable than the anti conformation. Draw Newman projections of these conformers, and explain this curious result.
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Textbook Question
The most stable form of the common sugar glucose contains a six-membered ring in the chair conformation with all the substituents equatorial. Draw this most stable conformation of glucose.
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Textbook Question
Convert each Newman projection to the equivalent line–angle formula, and assign the IUPAC name.
(a)
(b)
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Textbook Question
Draw Newman projections along the C3―C4 bond to show the most stable and least stable conformations of 3-ethyl-2,4,4-trimethylheptane.
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Textbook Question
Using what you know about the conformational energetics of substituted cyclohexanes, predict which of the two decalin isomers is more stable. Explain your reasoning.
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