Homework Help is Here – Start Your Trial Now!
Science
Chemistry
3 It 4 d quintet 4 H S H d 14 types (4 signals

3 It 4 d quintet 4 H S H d 14 types (4 signals

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
See similar textbooks
icon
Related questions
Question

NMR interpretation:

Is this correct?

My reasoning is the methyl is next to the green hydrogen so following the n+1 rule, would make the methyl a doublet (d). The hydrogen to the right of the carbonyl has no neighbors, so it's a singlet (s). And the green hydrogen is a quintet (m) since it has the 1 red hydrogen and the 3 black hydrogens as neighbors.

Therefore, we should see a 3H, d 1-2.5 ppm; 1H m 4.5-6.5 ppm;  1H, d 4.5-6.5 ppm; and 1H, s 9-10ppm.

If it's not correct, can you please explain how to predict the NMR patterns and integrations for this?

Thank you!

**Understanding NMR Spectroscopy: Signal Interpretation** In this educational guide, we'll explore how to interpret nuclear magnetic resonance (NMR) spectra signals for a given molecular structure. The image provided illustrates a typical example of a simple organic molecule examined under NMR spectroscopy. ### Molecular Structure The hand-drawn molecular structure in the image consists of several hydrogen atoms (H) connected to a carbon-based framework. The structure can be described as follows: - **Main Carbon Chain:** The carbon skeleton is annotated with a set of hydrogen atoms attached directly to the carbon atoms. - **Hydrogen Atoms (H):** Each "H" represents hydrogen atoms on the molecule, whereas the numbers and symbols around them represent their specific environments and the NMR signals they produce. ### Signal Splitting and Types - **Signal Splitting Patterns:** - **Quintet:** Indicated by the label "quintet" next to a hydrogen atom. This means the hydrogen atom has a splitting pattern where it signals five peaks in the NMR spectrum. - **Doublet (d):** Doublet signals, marked as "d" beside the hydrogen atoms, indicate a splitting pattern of two peaks. - **Singlet (S):** This signal type does not split and appears as a single peak in the spectrum. ### Interpretation - **4 Types and 4 Signals:** The boxed note indicates that there are "4 types" of hydrogen environments in the molecule, hence there will be "4 signals" in the NMR spectrum. ### Key Concepts: - **Quintet (5 peaks):** Arises because the hydrogen is coupled to 4 adjacent hydrogens. - **Doublet (2 peaks):** Arises due to the hydrogen being coupled to one adjacent hydrogen. - **Singlet (1 peak):** No coupling; likely isolated hydrogen or a symmetrical environment. ### Diagrams The handwritten molecular structure and annotation demonstrate the concept of NMR signal splitting based on hydrogen environments and their chemical shifts. This is a vital skill in analyzing complex molecules in organic chemistry. Understanding these key concepts of NMR spectroscopy will allow you to interpret and predict the spectra for simple organic molecules and understand their structural implications.
Transcribed Image Text:**Understanding NMR Spectroscopy: Signal Interpretation** In this educational guide, we'll explore how to interpret nuclear magnetic resonance (NMR) spectra signals for a given molecular structure. The image provided illustrates a typical example of a simple organic molecule examined under NMR spectroscopy. ### Molecular Structure The hand-drawn molecular structure in the image consists of several hydrogen atoms (H) connected to a carbon-based framework. The structure can be described as follows: - **Main Carbon Chain:** The carbon skeleton is annotated with a set of hydrogen atoms attached directly to the carbon atoms. - **Hydrogen Atoms (H):** Each "H" represents hydrogen atoms on the molecule, whereas the numbers and symbols around them represent their specific environments and the NMR signals they produce. ### Signal Splitting and Types - **Signal Splitting Patterns:** - **Quintet:** Indicated by the label "quintet" next to a hydrogen atom. This means the hydrogen atom has a splitting pattern where it signals five peaks in the NMR spectrum. - **Doublet (d):** Doublet signals, marked as "d" beside the hydrogen atoms, indicate a splitting pattern of two peaks. - **Singlet (S):** This signal type does not split and appears as a single peak in the spectrum. ### Interpretation - **4 Types and 4 Signals:** The boxed note indicates that there are "4 types" of hydrogen environments in the molecule, hence there will be "4 signals" in the NMR spectrum. ### Key Concepts: - **Quintet (5 peaks):** Arises because the hydrogen is coupled to 4 adjacent hydrogens. - **Doublet (2 peaks):** Arises due to the hydrogen being coupled to one adjacent hydrogen. - **Singlet (1 peak):** No coupling; likely isolated hydrogen or a symmetrical environment. ### Diagrams The handwritten molecular structure and annotation demonstrate the concept of NMR signal splitting based on hydrogen environments and their chemical shifts. This is a vital skill in analyzing complex molecules in organic chemistry. Understanding these key concepts of NMR spectroscopy will allow you to interpret and predict the spectra for simple organic molecules and understand their structural implications.
Expert Solution
steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Statistics and Analytical Chemistry
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Chemistry
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
SEE MORE TEXTBOOKS