Organic Chemistry
Organic Chemistry
4th Edition
ISBN: 9780073402772
Author: Janice G. Smith
Publisher: MCG
Question
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Chapter 21, Problem 21.35P
Interpretation Introduction

(a)

Interpretation: The lactol formed from intramolecular cyclization of given hydroxyl aldehyde is to be predicted.

Concept introduction: Aldehydes or ketones on reaction with one equivalent of alcohol form hemiacetal and on reaction with two equivalents of alcohol it forms acetals. This is nucleophilic addition reaction. These reactions takes place in presence of acids, commonly p-toluenesulfonicacid.

Cyclic hemiacetals containing five or six-membered rings are generally stable and can be isolated.

Interpretation Introduction

(b)

Interpretation: The lactol formed from intramolecular cyclization of given hydroxyl aldehyde is to be predicted.

Concept introduction: Aldehydes or ketones on reaction with one equivalent of alcohol form hemiacetal and on reaction with two equivalents of alcohol it forms acetals. This is nucleophilic addition reaction. These reactions takes place in presence of acids, commonly p-toluenesulfonicacid.

Cyclic hemiacetals containing five or six-membered rings are generally stable and can be isolated.

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Chapter 21 Solutions

Organic Chemistry

Ch. 21 - Prob. 21.11PCh. 21 - Prob. 21.12PCh. 21 - Prob. 21.13PCh. 21 - Prob. 21.14PCh. 21 - Problem 21.15 Draw the product of each...Ch. 21 - Prob. 21.16PCh. 21 - Prob. 21.17PCh. 21 - Outline a synthesis of each Wittig reagent from...Ch. 21 - Draw the products including stereoisomers formed...Ch. 21 - Prob. 21.20PCh. 21 - Prob. 21.21PCh. 21 - Show two methods to synthesize each alkene: a...Ch. 21 - Problem 21.22 The product formed when reacts with...Ch. 21 - What 1 amine and carbonyl compound are needed to...Ch. 21 - Prob. 21.25PCh. 21 - Prob. 21.26PCh. 21 - Prob. 21.27PCh. 21 - Problem 21.28 Draw a stepwise mechanism for the...Ch. 21 - Problem 21.29 Draw the products of each...Ch. 21 - Problem 21.30 Label each compound as an acetal, a...Ch. 21 - Problem 21.31 Draw a stepwise mechanism for the...Ch. 21 - Problem 21.32 Draw the products of each...Ch. 21 - Problem 21.33 Safrole is a naturally occurring...Ch. 21 - Problem 21.35 How would you use a protecting group...Ch. 21 - Prob. 21.35PCh. 21 - Problem 21.37 Two naturally occurring compounds...Ch. 21 - Problem 21.38 Draw the products of each...Ch. 21 - Prob. 21.38PCh. 21 - Problem 21.40 (a) Give the IUPAC name for A and B....Ch. 21 - 21.41 Rank the following compounds in order of...Ch. 21 - Prob. 21.41PCh. 21 - Give the IUPAC name for each compound. a. d. g. b....Ch. 21 - Give the structure corresponding to each name. a....Ch. 21 - Including stereoisomers, draw the 11 aldehydes...Ch. 21 - Prob. 21.45PCh. 21 - Prob. 21.46PCh. 21 - What alkyl halide is needed to prepare each Wittig...Ch. 21 - 21.46 Draw the products of each reaction. a. e....Ch. 21 - Prob. 21.49PCh. 21 - Prob. 21.50PCh. 21 - Prob. 21.51PCh. 21 - Prob. 21.52PCh. 21 - Prob. 21.53PCh. 21 - Rank the following compounds in order of...Ch. 21 - Which compound forms the higher concentration of...Ch. 21 - Prob. 21.56PCh. 21 - What Wittig reagent and carbonyl compound are...Ch. 21 - Prob. 21.58PCh. 21 - What reagents are needed to convert each compound...Ch. 21 - What reagents are needed to convert each compound...Ch. 21 - Prob. 21.61PCh. 21 - Devise a synthesis of each alkene using a Wittig...Ch. 21 - Devise a synthesis of each compound from...Ch. 21 - Prob. 21.64PCh. 21 - Prob. 21.65PCh. 21 - Prob. 21.66PCh. 21 - Prob. 21.67PCh. 21 - Prob. 21.68PCh. 21 - Prob. 21.69PCh. 21 - 21.64 Draw a stepwise mechanism for the following...Ch. 21 - 21.65 Draw a stepwise mechanism f or the following...Ch. 21 - Prob. 21.72PCh. 21 - 21.67 Draw a stepwise mechanism for each...Ch. 21 - 21.68 Draw a stepwise mechanism for the following...Ch. 21 - Prob. 21.75PCh. 21 - Prob. 21.76PCh. 21 - Prob. 21.77PCh. 21 - Prob. 21.78PCh. 21 - Prob. 21.79PCh. 21 - 21.73 Although the carbonyl absorption of cyclic...Ch. 21 - 21.74 Use the and data to determine the...Ch. 21 - 21.75 A solution of acetone in ethanol in the...Ch. 21 - Compounds A and B have molecular formula ....Ch. 21 - 21.77 An unknown compound C of molecular formula ...Ch. 21 - 21.78 An unknown compound D exhibits a strong...Ch. 21 - Prob. 21.86PCh. 21 - -D-Glucose, a hemiacetal, can be converted to a...Ch. 21 - 21.81 Draw a stepwise mechanism for the following...Ch. 21 - Prob. 21.89PCh. 21 - Prob. 21.90PCh. 21 - Prob. 21.91PCh. 21 - 21.86 Draw stepwise mechanism for the following...
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