Organic Chemistry - With Access (Custom)
4th Edition
ISBN: 9781259147760
Author: OHIO UNIV.
Publisher: MCG
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Chapter 20, Problem 20.80P
Interpretation Introduction
Interpretation: An explanation corresponding to the fact that the
Concept introduction: On the horizontal axis, the position of absorption is generally referred to as chemical shift. Depending upon the electron density or the concentration of electron around carbon, the chemical shift values of carbon varies relative to the reference signal. The terms, upfield and downfield expresses the relative location of signals. The meaning of upfield is to the right and of downfield is to the left.
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Explain why the β carbon of an α,β-unsaturated carbonyl compound absorbs farther downfield in the 13 C NMR spectrum than the α carbon, even though the α carbon is closer to the electron-withdrawing carbonyl group. For example, the β carbon of mesityl oxide absorbs at 150.5 ppm, while the α carbon absorbs at 122.5 ppm.
Explain why the β carbon of an α,β-unsaturated carbonyl compound absorbs farther downeld in the 13C NMR spectrum than the α carbon, even though the α carbon is closer to the electron-withdrawing carbonyl group. For example, the β carbon of mesityl oxide absorbs at 150.5 ppm, while the α carbon absorbs at 122.5 ppm.
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Chapter 20 Solutions
Organic Chemistry - With Access (Custom)
Ch. 20 - Prob. 20.1PCh. 20 - Which carbonyl groups in the anticancer drug taxol...Ch. 20 - Prob. 20.3PCh. 20 - Prob. 20.4PCh. 20 - Problem 20.5 What aldehyde or ketone is needed to...Ch. 20 - Prob. 20.6PCh. 20 - Problem 20.7 Draw the products formed when is...Ch. 20 - Prob. 20.8PCh. 20 - Prob. 20.9PCh. 20 - Prob. 20.10P
Ch. 20 - Draw the structure of both an acid chloride and an...Ch. 20 - Problem 20.12 Draw the products formed from ...Ch. 20 - Prob. 20.13PCh. 20 - Prob. 20.14PCh. 20 - What product is formed when...Ch. 20 - Prob. 20.16PCh. 20 - Problem-20.16 Review the oxidation reactions using...Ch. 20 - Problem-20.17 Write the step(s) needed to convert ...Ch. 20 - Problem-20.18 Oct-1-yne reacts rapidly with ,...Ch. 20 - Draw the product formed when each organometallic...Ch. 20 - Draw the product of each reaction. a.c. b.d.Ch. 20 - Draw the products including stereochemistry of the...Ch. 20 - What Grignard reagent and carbonyl compound are...Ch. 20 - Problem 20.24 Linalool (the Chapter 9 opening...Ch. 20 - Problem 20.25 What Grignard reagent and carbonyl...Ch. 20 - Prob. 20.26PCh. 20 - Draw the products formed when each compound is...Ch. 20 - What ester and Grignard reagent are needed to...Ch. 20 - What organocuprate reagent is needed to convert...Ch. 20 - What reagent is needed to convert (CH3)2CHCH2CHO...Ch. 20 - Prob. 20.31PCh. 20 - What carboxylic acid formed from each alkyl halide...Ch. 20 - Prob. 20.33PCh. 20 - Prob. 20.34PCh. 20 - Problem 20.35 Synthesize each compound from...Ch. 20 - Prob. 20.36PCh. 20 - 20.37 Devise a synthesis of each alcohol from...Ch. 20 - 20.38 Draw the products formed when pentanal is...Ch. 20 - Prob. 20.39PCh. 20 - Draw the product formed when CH3CH2CH2MgBr is...Ch. 20 - Draw the product formed when (CH3CH2CH2CH2)2CuLi...Ch. 20 - The stereochemistry of the products of reduction...Ch. 20 - Prob. 20.43PCh. 20 - What reagent is needed to convert...Ch. 20 - What reagent is needed to convert...Ch. 20 - Draw the products or each reduction reaction. a....Ch. 20 - Prob. 20.47PCh. 20 - Draw all stereoisomers formed in each reaction. a....Ch. 20 - Prob. 20.49PCh. 20 - 20.46 Treatment of ketone A with ethynylithium...Ch. 20 - 20.47 Explain why metal hydride reduction gives an...Ch. 20 - Prob. 20.52PCh. 20 - 20.49 Identify the lettered compounds in the...Ch. 20 - Prob. 20.54PCh. 20 - Draw a stepwise mechanism for each reaction. a. b.Ch. 20 - Prob. 20.56PCh. 20 - 20.54 Draw a stepwise mechanism for the following...Ch. 20 - What Grignard reagent and aldehyde or ketone are...Ch. 20 - Prob. 20.59PCh. 20 - What ester and Grignard reagent are needed to...Ch. 20 - What organolithium reagent and carbonyl compound...Ch. 20 - 20.59 What epoxide and organometallic reagent are...Ch. 20 - Prob. 20.63PCh. 20 - 20.61 Propose two different methods to synthesize...Ch. 20 - Synthesize each compound from cyclohexanol using...Ch. 20 - Prob. 20.66PCh. 20 - Prob. 20.67PCh. 20 - Devise three different methods to prepare each...Ch. 20 - Convert benzene into each compound. You may also...Ch. 20 - Design a synthesis of each compound from alcohols...Ch. 20 - Synthesize each compound from the given starting...Ch. 20 - 20.69 An unknown compound A (molecular formula )...Ch. 20 - 20.70 Treatment of compound C (molecular formula )...Ch. 20 - 20.71 Treatment of compound E (molecular formula )...Ch. 20 - 20.72 Reaction of butanenitrile () with methyl...Ch. 20 - 20.73 Treatment of isobutene with forms a...Ch. 20 - Prob. 20.77PCh. 20 - Prob. 20.78PCh. 20 - 20.76 Lithium tri-sec-butylborohydride, also known...Ch. 20 - Prob. 20.80PCh. 20 - Prob. 20.81PCh. 20 - Prob. 20.82PCh. 20 - 20.80 Draw a stepwise mechanism for the following...Ch. 20 - Prob. 20.84P
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