Robert Burns Woodward

Lore & Background

Robert Burns Woodward was an American organic chemist, widely regarded as the preeminent synthetic organic chemist of the twentieth century. He made key contributions to the synthesis of complex natural products and the determination of their molecular structure, receiving the Nobel Prize in Chemistry in 1965 for his outstanding achievements in the art of organic synthesis. Woodward’s defining characteristic was his rational, predictive approach to synthesis, applying principles of physical organic chemistry to construct exceedingly complicated molecules. He was among the first synthetic chemists to use empirical rules of reactivity as a predictive framework, a style that inspired hundreds of subsequent chemists. His early major contribution was a series of papers applying ultraviolet spectroscopy to elucidate natural product structures, collecting empirical data to devise Woodward’s rules. In 1944, with William von Eggers Doering, he reported the landmark synthesis of quinine, showing that complex structures could be rationally constructed. He later synthesized cholesterol, cortisone, strychnine, lysergic acid, reserpine, chlorophyll, cephalosporin, and colchicine. Woodward worked closely with Roald Hoffmann on theoretical studies of chemical reactions and with Albert Eschenmoser. He spent most of his career at Harvard University, where he was named Donner Professor of Science, freeing him from teaching to focus on research.

Reader's Guide

Woodward's early work established a systematic approach to determining molecular structures by compiling empirical data from ultraviolet spectroscopy, resulting in a set of predictive rules. This method marked a departure from the slower, purely chemical techniques previously used. His 1944 synthesis of quinine, achieved with William von Eggers Doering, was a landmark because it demonstrated that complex natural products could be rationally constructed using established principles of reactivity and structure, rather than by trial and error. He was among the first synthetic chemists to apply the mechanistic rules developed by Ingold and Robinson as a predictive framework for synthesis. Throughout his career, he repeatedly employed the Diels–Alder reaction, both theoretically and experimentally, having been fascinated by it since reading the original communication as a teenager. His syntheses of cholesterol, cortisone, strychnine, lysergic acid, reserpine, chlorophyll, cephalosporin, and colchicine inaugurated what became known as the 'Woodwardian era', showing that physical organic chemistry could guide the construction of highly complex molecules. This style inspired subsequent generations of synthetic chemists working on medicinally important natural products.

Did You Know?

• Woodward's father died in the 1918 influenza pandemic.
• In 1928, he contacted the German consulate to obtain original papers, including Diels and Alder's communication on the Diels–Alder reaction.
• He entered MIT in 1933 but was excluded for neglecting formal studies; readmitted in 1935, he earned a Bachelor of Science in 1936 and a doctorate in 1937.
• In 1944, with William von Eggers Doering, he synthesized quinine, a landmark showing organic synthesis could be rational.
• In the early 1950s, with Geoffrey Wilkinson, he postulated the structure of ferrocene, beginning transition metal organometallic chemistry.