Organic Chemistry
Organic Chemistry
9th Edition
ISBN: 9781305080485
Author: John E. McMurry
Publisher: Cengage Learning
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Chapter 19.14, Problem 26P
Interpretation Introduction

Interpretation:

The prominent IR absorptions and mass spectral peaks expected for the compound given are to be stated.

Concept introduction:

Aldehydes and ketones show a strong absorption band in IR from 1660-1770 cm-1. Aldehydes show two characteristic C-H absorptions between 2700-2760cm-1 and 2800-2860 cm-1. Saturated aldehydes absorb near 1730 cm-1 while aromatic aldehydes and α, β- unsaturated aldehydes absorb near 1705 cm-1. Saturated ketones and cyclohexanones absorb near 1715 cm-1 while aromatic ketones and α, β- unsaturated ketones absorb near 1685-1690 cm-1.

In the mass spectrum of organic compounds, normally peaks due to Mc Lafferty rearrangement and α cleavage are generally visible. In Mc Lafferty rearrangement, aldehydes and ketones that have hydrogens on the γ carbons transfer the hydrogen on the carbon to the carbonyl oxygen and the bond between the α and β carbons is broken to yield an alkene. The chwarge remains with the oxygen containing fragment. In the α cleavage, the bond between the carbonyl carbon and the α carbon breaks to yield a neutral radical and a resaonance stabilized acyl cation.

To state:

The prominent IR absorptions and mass spectral peaks expected for the compound given.

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Chapter 19 Solutions

Organic Chemistry

Ch. 19.8 - Prob. 11PCh. 19.8 - Prob. 12PCh. 19.9 - Prob. 13PCh. 19.10 - Prob. 14PCh. 19.10 - Prob. 15PCh. 19.11 - What carbonyl compound and what phosphorus ylide...Ch. 19.11 - -Carotene, a yellow food-coloring agent and...Ch. 19.12 - Prob. 18PCh. 19.12 - Prob. 19PCh. 19.13 - Prob. 20PCh. 19.13 - Treatment of 2-cyclohexenone with HCN/KCN yields a...Ch. 19.13 - How might conjugate addition reactions of lithium...Ch. 19.14 - How might you use IR spectroscopy to determine...Ch. 19.14 - Prob. 24PCh. 19.14 - Prob. 25PCh. 19.14 - Prob. 26PCh. 19.SE - Each of the following substances can be prepared...Ch. 19.SE - Prob. 28VCCh. 19.SE - Prob. 29VCCh. 19.SE - Prob. 30MPCh. 19.SE - Prob. 31MPCh. 19.SE - Prob. 32MPCh. 19.SE - Prob. 33MPCh. 19.SE - Prob. 34MPCh. 19.SE - Prob. 35MPCh. 19.SE - It is not uncommon for organic chemists to prepare...Ch. 19.SE - Prob. 37MPCh. 19.SE - Prob. 38MPCh. 19.SE - Prob. 39MPCh. 19.SE - Prob. 40MPCh. 19.SE - Aldehydes and ketones react with thiols to yield...Ch. 19.SE - Prob. 42MPCh. 19.SE - When cyclohexanone is heated in the presence of a...Ch. 19.SE - Prob. 44MPCh. 19.SE - The Meerwein-Ponndorf-Verley reaction involves...Ch. 19.SE - Propose a mechanism to account for the formation...Ch. 19.SE - Prob. 47MPCh. 19.SE - Prob. 48MPCh. 19.SE - Treatment of an , -unsaturated ketone with basic...Ch. 19.SE - Prob. 50MPCh. 19.SE - Prob. 51MPCh. 19.SE - Prob. 52MPCh. 19.SE - Prob. 53MPCh. 19.SE - Prob. 54APCh. 19.SE - Draw and name the seven aldehydes and ketones with...Ch. 19.SE - Give IUPAC names for the following compounds:Ch. 19.SE - Draw structures of compounds that fit the...Ch. 19.SE - Predict the products of the reaction of (1)...Ch. 19.SE - Show how you might use a Wittig reaction to...Ch. 19.SE - How would you use a Grignard reaction on an...Ch. 19.SE - Prob. 61APCh. 19.SE - Prob. 62APCh. 19.SE - How would you synthesize the following substances...Ch. 19.SE - Carvone is the major constituent of spearmint oil....Ch. 19.SE - How would you synthesize the following compounds...Ch. 19.SE - At what position would you expect to observe IR...Ch. 19.SE - Acidcatalyzed dehydration of...Ch. 19.SE - Choose the structure that best fits the IR...Ch. 19.SE - Propose structures for molecules that meet the...Ch. 19.SE - Prob. 70APCh. 19.SE - Prob. 71APCh. 19.SE - When 4hydroxybutanal is treated with methanol in...Ch. 19.SE - Prob. 73APCh. 19.SE - Prob. 74APCh. 19.SE - Prob. 75APCh. 19.SE - Prob. 76APCh. 19.SE - Prob. 77APCh. 19.SE - Tamoxifen is a drug used in the treatment of...Ch. 19.SE - Compound A, MW 86, shows an IR absorption at 1730...Ch. 19.SE - Compound B is isomeric with A (Problem 19-79) and...Ch. 19.SE - The 1HNMR spectrum shown is that of a compound...Ch. 19.SE - Prob. 82APCh. 19.SE - Propose structures for ketones or aldehydes that...Ch. 19.SE - Prob. 84APCh. 19.SE - Prob. 85APCh. 19.SE - The proton and carbon NMR spectra for each of...Ch. 19.SE - The proton NMR spectrum for a compound with...
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