Ronald C. D. Breslow is an American chemist from Rahway, New Jersey. He is currently University Professor at Columbia University, where he is based in the Department of Chemistry and affiliated with the Departments of Biological Sciences and Pharmacology; he has also been on the faculty of its Department of Chemical Engineering. He has taught at Columbia since 1956 and is a former chair of the university's chemistry department.
He is interested in the design and synthesis of new molecules with interesting properties, and the study of these properties. Examples include the cyclopropenyl cation, the simplest aromatic system and the first aromatic compound prepared with other than six electrons in a ring. His seminal contributions concerning the mechanism of the vitamin B1 catalyzed benzoin condensation and the rate enhancement gained by performing organic transformations on water, among many others, sparked new avenues of chemical research.
Breslow earned his B.A., M.A. and Ph.D. from Harvard University, where his doctoral advisor was R. B. Woodward. Among Breslow's former Ph.D. students is Robert Grubbs, who won the Nobel Prize in Chemistry in 2005, and Doug La Follette, Secretary of State of Wisconsin.