Karl Barry Sharpless

Lore & Background

Karl Barry Sharpless is an American stereochemist whose work has fundamentally reshaped synthetic chemistry. He earned his Ph.D. from Stanford University and completed postdoctoral research at both Stanford and Harvard. His academic career included professorships at the Massachusetts Institute of Technology and Stanford University before he led a laboratory at Scripps Research. Sharpless is best known for developing a suite of stereoselective oxidation reactions that transformed asymmetric synthesis, including the Sharpless asymmetric epoxidation, dihydroxylation, and aminohydroxylation. While at Stanford, he applied the asymmetric epoxidation to synthesize (+)-disparlure. Around the year 2000, he coined the term "click chemistry," which describes a set of highly selective, exothermic reactions that proceed under mild conditions. The most successful example of this concept is the azide-alkyne Huisgen cycloaddition to form 1,2,3-triazoles. He also demonstrated that an enzyme could catalyze the formation of an inhibitor with femtomolar potency from an azide and an alkyne. Sharpless is a two-time Nobel laureate, receiving half of the 2001 Nobel Prize in Chemistry for chirally catalyzed oxidation reactions and one third of the 2022 prize for the development of click chemistry and bioorthogonal chemistry. He is one of only five individuals to have won two Nobel Prizes, and one of three to win two in the same discipline. In 1970, shortly after arriving at MIT as an assistant professor, he lost sight in one eye when an NMR tube exploded in the lab, an accident he cites to emphasize the necessity of wearing safety glasses at all times.

Reader's Guide

Karl Barry Sharpless is a pivotal figure in modern chemistry, recognized for transforming asymmetric synthesis and for founding the field of click chemistry. His work on chirally catalyzed oxidation reactions, such as the Sharpless epoxidation, dihydroxylation, and oxyamination, made the synthesis of chiral molecules far more practical and routine. These methods have widespread applications in pharmaceuticals and materials science. Bertozzi and Morten P. Meldal). He is one of only five individuals to have won two Nobel Prizes, and the third to win two in the same discipline. His legacy is that of a chemist who both deepened fundamental understanding and created practical tools that have reshaped chemical research and industry.

Did You Know?

• Sharpless is the fifth person to have twice been awarded a Nobel Prize, along with Marie Curie, John Bardeen, Linus Pauling, and Frederick Sanger.
• Sharpless originally planned to attend medical school before a research professor convinced him to continue in chemistry.

Source Material Mismatch

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What the Source Does Cover

The material is a broad roster of chemists recognized for contributions to basic or applied chemistry. The list spans disciplines from nuclear chemistry and mineralogy to nanomedicine and computational methods, and it notes nationalities, birth and death years, and one-line research descriptors. It serves as a directory rather than a biographical narrative, offering no extended discussion of any single individual's career arc, defining moments, or legacy beyond a brief appositive phrase.

Editorial Constraint Explained

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Recommended Next Step

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