The structure of compound X consistent with the given information is to be proposed and the formation of X is to be stated. Concept introduction: In the proton NMR spectrum of ketones and aldehydes , we primarily see proton is attached to the carbonyl group (aldehyde or ketone protons) and the proton is attached to the adjacent carbon atom. The chemical shift value between δ 9 and δ 10 indicates the presence of aldehyde proton in proton NMR spectrum of an aldehydes. The chemical shift value between δ 2.1 and δ 2.4 indicates the presence of protons on the α carbon atom of a ketone or aldehyde, if there are no other electron withdrawing groups nearby in the proton NMR spectrum of ketones and aldehydes.

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Answer 1

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 18, Problem 18.75SP

Interpretation Introduction

Interpretation:

The structure of compound X consistent with the given information is to be proposed and the formation of X is to be stated.

Concept introduction:

In the proton NMR spectrum of ketones and aldehydes, we primarily see proton is attached to the carbonyl group (aldehyde or ketone protons) and the proton is attached to the adjacent carbon atom. The chemical shift value between δ 9 and δ 10 indicates the presence of aldehyde proton in proton NMR spectrum of an aldehydes.

The chemical shift value between δ 2.1 and δ 2.4 indicates the presence of protons on the α carbon atom of a ketone or aldehyde, if there are no other electron withdrawing groups nearby in the proton NMR spectrum of ketones and aldehydes.

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Interpreting NMR spectra is a skill that often requires some amount of practice, which, in turn, necessitates access to a collection of NMR spectra. Beyond Labz Organic Synthesis and Organic Qualitative Analysis have spectral libraries containing over 700 1H NMR spectra. In this assignment, you will take advantage of this by first predicting the NMR spectra for two closely related compounds and then checking your predictions by looking up the actual spectra in the spectra library. After completing this assignment, you may wish to select other compounds for additional practice. 1. Write the IUPAC names for the following two structures: Question 2 Question 3 2. Predict the NMR spectra for each of these two compounds by listing, in the NMR tables below, the chemical shift, the splitting, and the number of hydrogens associated with each predicted peak. Sort the peaks from largest chemical shift to lowest. **Not all slots must be filled**

11:14 ... worksheets.beyondlabz.com 3. To check your predictions, click this link for Interpreting NMR Spectra 1. You will see a list of all the - compounds in the spectra library in alphabetical order by IUPAC name. Hovering over a name in the list will show the structure on the chalkboard. The four buttons on the top of the Spectra tab in the tray are used to select the different spectroscopic techniques for the selected compound. Make sure the NMR button has been selected. 4. Scroll through the list of names to find the names for the two compounds you have been given and click on the name to display the NMR spectrum for each. In the NMR tables below, list the chemical shift, the splitting, and the number of hydrogens associated with each peak for each compound. Compare your answers to your predictions. **Not all slots must be filled** Peak Chemical Shift (d) Multiplicity 1 2 3 4 5

О δα HO- H -Br δα HO-- + + -Br [B] 8+ HO- -Br δα न

Answer 2

Question

Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 18, Problem 18.75SP

Interpretation Introduction

Interpretation:

The structure of compound X consistent with the given information is to be proposed and the formation of X is to be stated.

Concept introduction:

In the proton NMR spectrum of ketones and aldehydes, we primarily see proton is attached to the carbonyl group (aldehyde or ketone protons) and the proton is attached to the adjacent carbon atom. The chemical shift value between δ 9 and δ 10 indicates the presence of aldehyde proton in proton NMR spectrum of an aldehydes.

The chemical shift value between δ 2.1 and δ 2.4 indicates the presence of protons on the α carbon atom of a ketone or aldehyde, if there are no other electron withdrawing groups nearby in the proton NMR spectrum of ketones and aldehydes.

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Answer 3

Question

Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 18, Problem 18.75SP

Interpretation Introduction

Interpretation:

The structure of compound X consistent with the given information is to be proposed and the formation of X is to be stated.

Concept introduction:

In the proton NMR spectrum of ketones and aldehydes, we primarily see proton is attached to the carbonyl group (aldehyde or ketone protons) and the proton is attached to the adjacent carbon atom. The chemical shift value between δ 9 and δ 10 indicates the presence of aldehyde proton in proton NMR spectrum of an aldehydes.

The chemical shift value between δ 2.1 and δ 2.4 indicates the presence of protons on the α carbon atom of a ketone or aldehyde, if there are no other electron withdrawing groups nearby in the proton NMR spectrum of ketones and aldehydes.

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 4

Question

Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 18, Problem 18.75SP

Interpretation Introduction