Organic Chemistry: Principles And Mechanisms: Study Guide/solutions Manual (second)
Organic Chemistry: Principles And Mechanisms: Study Guide/solutions Manual (second)
2nd Edition
ISBN: 9780393655551
Author: KARTY, Joel
Publisher: W. W. Norton & Company
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Chapter 18, Problem 18.72P
Interpretation Introduction

(a)

Interpretation:

The detailed mechanism for the given equation of cross aldol reaction using a weak base such as pyridine is to be drawn.

Concept introduction:

Like aldehyde or ketone, the diethyl malonate having α hydrogen can be converted to a good nucleophile by reacting it with a weak base. The diethyl malonate, in the presence of a base, undergoes deprotonation at the α carbon (the carbon between two carbonyl groups) and forms stabilized carbanion, which can be resonance stabilized by both carbonyl groups. The carbanion undergoes nucleophilic addition reaction with polar π bonds like aldehyde or ketone, similar to crossed aldol reaction.

Interpretation Introduction

(b)

Interpretation:

Why a relatively weak base can be used in the given crossed aldol reaction of diethyl malonate it is to be explained.

Concept introduction:

Like aldehyde or ketone, the diethyl malonate having α hydrogen can be converted to a good nucleophile by reacting it with a weak base. The diethyl malonate, in the presence of a base, undergoes deprotonation at the α carbon (the carbon between two carbonyl groups) and forms stabilized carbanion, which can be resonance stabilized by both carbonyl groups. The carbanion undergoes nucleophilic addition reaction with polar π bonds like aldehyde or ketone, similar to crossed aldol reaction.

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Chapter 18 Solutions

Organic Chemistry: Principles And Mechanisms: Study Guide/solutions Manual (second)

Ch. 18 - Prob. 18.11PCh. 18 - Prob. 18.12PCh. 18 - Prob. 18.13PCh. 18 - Prob. 18.14PCh. 18 - Prob. 18.15PCh. 18 - Prob. 18.16PCh. 18 - Prob. 18.17PCh. 18 - Prob. 18.18PCh. 18 - Prob. 18.19PCh. 18 - Prob. 18.20PCh. 18 - Prob. 18.21PCh. 18 - Prob. 18.22PCh. 18 - Prob. 18.23PCh. 18 - Prob. 18.24PCh. 18 - Prob. 18.25PCh. 18 - Prob. 18.26PCh. 18 - Prob. 18.27PCh. 18 - Prob. 18.28PCh. 18 - Prob. 18.29PCh. 18 - Prob. 18.30PCh. 18 - Prob. 18.31PCh. 18 - Prob. 18.32PCh. 18 - Prob. 18.33PCh. 18 - Prob. 18.34PCh. 18 - Prob. 18.35PCh. 18 - Prob. 18.36PCh. 18 - Prob. 18.37PCh. 18 - Prob. 18.38PCh. 18 - Prob. 18.39PCh. 18 - Prob. 18.40PCh. 18 - Prob. 18.41PCh. 18 - Prob. 18.42PCh. 18 - Prob. 18.43PCh. 18 - Prob. 18.44PCh. 18 - Prob. 18.45PCh. 18 - Prob. 18.46PCh. 18 - Prob. 18.47PCh. 18 - Prob. 18.48PCh. 18 - Prob. 18.49PCh. 18 - Prob. 18.50PCh. 18 - Prob. 18.51PCh. 18 - Prob. 18.52PCh. 18 - Prob. 18.53PCh. 18 - Prob. 18.54PCh. 18 - Prob. 18.55PCh. 18 - Prob. 18.56PCh. 18 - Prob. 18.57PCh. 18 - Prob. 18.58PCh. 18 - Prob. 18.59PCh. 18 - Prob. 18.60PCh. 18 - Prob. 18.61PCh. 18 - Prob. 18.62PCh. 18 - Prob. 18.63PCh. 18 - Prob. 18.64PCh. 18 - Prob. 18.65PCh. 18 - Prob. 18.66PCh. 18 - Prob. 18.67PCh. 18 - Prob. 18.68PCh. 18 - Prob. 18.69PCh. 18 - Prob. 18.70PCh. 18 - Prob. 18.71PCh. 18 - Prob. 18.72PCh. 18 - Prob. 18.73PCh. 18 - Prob. 18.74PCh. 18 - Prob. 18.75PCh. 18 - Prob. 18.76PCh. 18 - Prob. 18.77PCh. 18 - Prob. 18.78PCh. 18 - Prob. 18.79PCh. 18 - Prob. 18.80PCh. 18 - Prob. 18.81PCh. 18 - Prob. 18.82PCh. 18 - Prob. 18.83PCh. 18 - Prob. 18.84PCh. 18 - Prob. 18.85PCh. 18 - Prob. 18.86PCh. 18 - Prob. 18.87PCh. 18 - Prob. 18.88PCh. 18 - Prob. 18.89PCh. 18 - Prob. 18.90PCh. 18 - Prob. 18.91PCh. 18 - Prob. 18.92PCh. 18 - Prob. 18.93PCh. 18 - Prob. 18.94PCh. 18 - Prob. 18.95PCh. 18 - Prob. 18.96PCh. 18 - Prob. 18.97PCh. 18 - Prob. 18.98PCh. 18 - Prob. 18.99PCh. 18 - Prob. 18.100PCh. 18 - Prob. 18.101PCh. 18 - Prob. 18.102PCh. 18 - Prob. 18.103PCh. 18 - Prob. 18.1YTCh. 18 - Prob. 18.2YTCh. 18 - Prob. 18.3YTCh. 18 - Prob. 18.4YTCh. 18 - Prob. 18.5YTCh. 18 - Prob. 18.6YTCh. 18 - Prob. 18.7YTCh. 18 - Prob. 18.8YTCh. 18 - Prob. 18.9YTCh. 18 - Prob. 18.10YTCh. 18 - Prob. 18.11YTCh. 18 - Prob. 18.12YTCh. 18 - Prob. 18.13YTCh. 18 - Prob. 18.14YTCh. 18 - Prob. 18.15YT
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