CONTENTS e25 Secondary Metabolites:An Introduction to Natural Products Chemistry877 25-1 Classifying Natural Products 25-2 Biosynthesis of Pyridoxal Phosphate 87 25-3 Biosynthesis of Morphine 4 25-4 Biosynthesis of Erythromycin 894 SoMETHING EXTRA Bioprospecting:Hunting for Natural Products 903 e26 Orbitals and Organic Chemistry: Pericyclic Reactions 905 26-1 Molecular Orbitals of Conjugated Pi Systems 905 26-2 Electrocyclic Reactions 908 26-3 Stereochemistry of Thermal Electrocyclic Reactions 264 Photochemical Electrocyclic Reactions 78 26-5 Cycloaddition Reactions 913 26-6 Stereochemistry of Cycloadditions 26-7 Sigmatropic Rearrangements 26-8 Some Examples of Sigmatropic Rearrangements 919 26-9 A Summary of Rules for Pericyclic Reactions SOMETHING EXTRA Vitamin D,the Sunshine Vitamin 922 e27 Synthetic Polymers 925 27- Chain-Growth Polymers 926 22.2 Stereochemistry of Polymerization:Ziegler-Natta Catalysts 928 27-3 Copolymers 930 27-4 Step-Growth Polymers 932Contents xvii To access the following online-only chapters, enter ISBN: 978-1-285-84291-2 at www.cengagebrain.com and visit this book’s companion website. e25 secondary Metabolites: an introduction to natural Products Chemistry | 877 25-1 classifying natural products 878 25-2 Biosynthesis of pyridoxal phosphate 879 25-3 Biosynthesis of Morphine 884 25-4 Biosynthesis of Erythromycin 894 soMetHinG eXtra Bioprospecting: hunting for natural products 903 e26 orbitals and organic Chemistry: Pericyclic reactions | 905 26-1 Molecular orbitals of conjugated pi systems 905 26-2 Electrocyclic Reactions 908 26-3 stereochemistry of thermal Electrocyclic Reactions 910 26-4 photochemical Electrocyclic Reactions 912 26-5 cycloaddition Reactions 913 26-6 stereochemistry of cycloadditions 914 26-7 sigmatropic Rearrangements 917 26-8 some Examples of sigmatropic Rearrangements 919 26-9 a summary of Rules for pericyclic Reactions 921 soMetHinG eXtra Vitamin D, the sunshine Vitamin 922 e27 synthetic Polymers | 925 27-1 chain-growth polymers 926 27-2 stereochemistry of polymerization: Ziegler–natta catalysts 928 27-3 copolymers 930 27-4 step-growth polymers 932 42912_00_FM_i-xxiv.indd 17 1/16/14 3:00 PM Copyright 2015 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s). Editorial review has deemed that any suppressed content does not materially affect the overall learning experience. Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it