Teaches and enables students to build confidence in drawing and manipulating curly arrows, a fundamental skill for all organic chemists
This book is an interactive approach to learning about chemistry of the carbonyl groupinviting students to work through its pages with pencil and paper in hand. It educates with the belief that the most effective way to learn is by practice and interaction. With this in mind, the reader is asked to predict what would happen under a specific set of reaction conditions. The book is divided into frames: each frame poses a question and invites the reader to predict what will happen. Subsequent frames give the solution but then pose more questions to develop a theme further.
Chemistry of the Carbonyl Group: A Programmed Approach to Organic Reaction Mechanisms, Revised Edition provides a solid grounding in the fundamental reactions of carbonyls. Presented in full colour to enhance the understanding of mechanisms within chemistry, the chapters of this step-by-step guide cover: nucleophilic addition to the carbonyl group; nucleophilic substitution; nucleophilic substitution at the carbonyl group with complete removal of carbonyl oxygen; carbanions and enolisation; and building organic molecules from carbonyl compounds.
A must-have book for undergraduate chemists to emphasise understanding in carbonyl group chemistryGoes through all the stages of basic carbonyl chemistry, detailing even the simplest mechanismsA step-by-step learning guide to synthetic chemistry for the first year of a chemistry degree, with all the information needed for independent learningProvides a solid grounding in the fundamental reactions of carbonyls which will inform the understanding of many other organic chemistry reactions
Chemistry of the Carbonyl Group: A Programmed Approach to Organic Reaction Mechanisms - Revised Edition is packed with all the information on synthetic chemistry that every first-year student will need in order to learn independently.
TIMOTHY K. DICKENS, FRSC, is Official Fellow, College Lecturer and Director of Studies in Chemistry at Peterhouse, Cambridge. Dr Dickens graduated from the University of Kent in 1982, and, after two years' research at Oxford, he joined Glaxo where he spent 24 years in both scientific and technology senior roles. In 2008, he joined the University of Cambridge, where his research has focused on Ring Currents in conjugated systems.
STUART WARREN, PHD, is the author of the textbooksOrganic Chemistry, Organic Synthesis: The Disconnection Approach andOrganic Synthesis. He retired from Churchill College, Department of Chemistry, University of Cambridge in 2006, having fostered some of the most successful organic chemistry academics in the UK.
Preface xi
Acknowledgements xiii
Some Help That You May Need xv
What Do You Need to Know Before You Start? xvii
Introduction xix
1 Nucleophilic Addition to the Carbonyl Group 1
Nucleophilic addition: what it is and how it happens 3
Alcohols as nucleophiles: acetal formation 6
Some carboncarbon bond-forming reactions with carbon nucleophiles: cyanide ion, acetylide ion and Grignard reagents 10
Hydride ion and its derivatives LiAlH4and NaBH4 Reduction of aldehydes and ketones 17
MeerweinPonndorf reduction and Oppenauer oxidation, with a branch program on how to draw transition states 19
Two general revision problems 25
2 Nucleophilic Substitution 29
Substitution: how it happens 31
LiAlH4 reduction of esters 33
Reaction of Grignard reagents with esters 34
Alkaline hydrolysis of esters 38
Acid hydrolysis of amides 39
Summary of acid and base catalysis 41
Reaction between carboxylic acids and thionyl chloride 41
Synthesis of esters and anhydrides from carboxylic acids 43
Review questions 45
3 Nucleophilic Subsitution at the Carbonyl Group with Complete Removal of Carbonyl Oxygen 49
Imine formation from aldehydes and ketones 51
Oxime formation and the structure of oximes 53
Hydrazone and semicarbazone formation 54
Reduction of C=O to CH2 56
Conversion of C=O to CCl2 60
DDT synthesis 64
Chloromethylation of aromatic compounds 65
Review questions 66
4 Carbanions and Enolisation 69
Carbanions 71
Tautomerism 72
Equilibration and racemisation of ketones by enolisation 73
Halogenation of ketones 78
Formation of bromo-acid derivatives 83
Organo-zinc derivatives and their use in synthesis 85
Review questions 87
5 Building Organic Molecules from Carbonyl Compounds 89
Using enols as nucleophiles to attack other carbonyl groups 92
The aldol reaction 92
The Claisen ester condensation 93
Acid catalysed condensation of acetone 94
Self-condensation reactions 96
Elaboration of a skeleton in synthesis 97
Cross-condensations with molecules which cannot enolise 98
Mannich reaction 103
Perkin reaction 105
Stable enols from -dicarbonyl compounds 108
Knoevenagel reaction 110
Alkylation of -dicarbonyl compounds 113
Michael reaction 116
Decarboxylation 125
Base cleavage of -dicarbonyl compounds 131
Cyclisation reactions: the Dieckmann condensation 134
Cyclisation of diketones 136
The dimedone synthesis 137
Ring opening by base cleavage of -dicarbonyl compounds 141
Revision questions 142
Examples of syntheses: two steroid syntheses 145
Storks cedrene synthesis 150
Index 155
