Organic Chemistry 5th Edition by Marc Loudon makes its first look in 4 colors, and with 1,668 issues--many of them new and taken straight from the scientific literature--this edition, greater than ever earlier than, encourages readers to analyze and synthesize concepts.
The presentation of stereochemistry is one other example. The basic idea of stereoisomers is introduced in Chapter four (Alkenes). A full chapter on stereochemistry comes two chapters later. Cyclic compounds and the stereochemistry of reactions follow subsequently. Then the ideas of group equivalence and nonequivalence are introduced even later, each in the context of enzyme catalysis and NMR spectroscopy.
The method to natural synthesis is one more example. This text starts with easy reactions after which shows college students how to consider them in reverse. Then, later, it introduces the idea of multistep synthesis using comparatively easy two- and three-step sequences. Later still, we now have another dialogue during which stereochemistry comes into play. Even later, using defending teams is introduced.
This “tiered presentation” of key topics requires some repetition. Although the repetition of key points might be considered inefficient, I believe that it is crucial to the learning process. When a topic is considered after its first introduction, I have provided detailed cross-referencing to the original material. Students are never cast adrift with terminology that has not been completely defined and reinforced.
Author introduced complex subjects in “tiers.” This means that students will see many concepts introduced initially in a fairly simply way, then reviewed with another layer of complexity added, and reviewed again at a greater level of sophistication. Acid–base chemistry, discussed above, is an example of tiered development. After the initial chapter on acid–base chemistry and the curved-arrow notation, these concepts are revisited in detail as they are used in the early examples of reactions and mechanisms, and again with the introduction of each new reaction type.
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