**2025 Textbook and Academic Authors Association (TAA) Textbook Excellence "Texty" Award Winner**Organic Synthesis, Fifth Edition provides a reaction-based approach to this important branch of organic chemistry. Updated and accessible, this eagerly-awaited revision offers a comprehensive foundation for graduate students coming from disparate backgrounds and knowledge levels, providing them with critical working knowledge of basic reactions, stereochemistry, and conformational principles. This reliable resource uniquely incorporates molecular modeling content, problems, and visualizations, and includes reaction examples and homework problems drawn from the latest in the current literature.There have been advancements in organic reactions, particularly organometallic reactions, and there is a need to show how these advancements have influenced current organic synthesis. The goal is to revise and update the reaction examples taken from the synthesis literature from 2017 to 2023. The reactions illustrate those used most often in modern organic synthesis, but these new examples will show their current relevance. Where new approaches and reactions have been developed for organic synthesis, examples have been added as new material.