Angewandte. Obituary

sizing the first antihistamine, Djerassi accepted a Carl Djerassi (1923–2015) position to head a research team at in . This group worked on developing a Carl Djerassi died at the age of 91 on January 30, practical synthesis of . Syntex was using 2015 at his home in after a long bout Mexican yams as a rich source of , the with cancer. He is best known for synthesizing the starting material for the synthesis of sex norethindrone and thus helping to and , the latter of which is involved in give women control over their fertility. He patented regulating the menstrual cycle, pregnancy, and it shortly after its synthesis in 1951, and it is used to embryogenesis of humans and other species. Pro- the present day in the oral contraceptive commonly gesterone was known to be degraded in the known as The Pill. He was recognized with the US stomach and gut. Syntex was seeking to find a National Medal of Science, the US National Medal form of progesterone that could be orally admin- Carl Djerassi of Technology, the , the istered. In 1951, Syntex filed a patent based on the of the American Chemical Society, work of Djerassis group for the compound 19-nor- and was awarded with more than 20 honorary 17a-ethynyltestosterone, known as norethindrone doctorates from universities all over the world. In (“nor” stands for the absence of a methyl group), later life he became a celebrated author of plays, which could enter the blood stream unaltered and poems, short stories, and a new writing genre he was several times more potent than naturally called “science in fiction”. Best known to occurring progesterone. Through subsequent clin- is his play Oxygen, which was written together with ical trials by Min Chueh Chang, Gregory Pincus, Chemistry Nobel Laureate . Few and John Rock, this compound was shown to be an can rival Djerassis combined accomplishments in effective contraceptive agent, giving rise to the chemistry and the arts. birth of The Pill. As one of his colleagues in the Chemistry Djerassi was a prolific scientific author, with Department at , I had the more than 1200 publications to his name. It would opportunity to get to know him well and observe be folly to imagine that anyone could summarize his multifaceted life. Space prevents me from this work in one paragraph, but I will try. His best offering a fuller description, but I can recommend scientific work might be his development and most enthusiastically his many autobiographical application of new methods for determining the writings (for further information see his website structures of organic compounds. Like in so many http://djerassi.com/), in particular, his last auto- other similar cases, these methods are used exten- biography In Retrospect: From the Pill to the Pen sively by others, but their origins are often forgot- (Imperial College Press, , 2014). Short of ten. During the 1950s and 1960s, Djerassi con- meeting him in person, nothing conveys the force, ducted extensive research on the structure elucida- character, charm, wit, and brutal honesty of Carl tion of antibiotics. His group was the very first to Djerassi than three particular videos. The first, determine the structure of a macrolide antibiotic made in 2009, celebrates Stanford pioneers in (this group contains many clinically important science and has a superb introduction to Djerassis compounds such as erythromycin). Djerassi pio- work by our colleague, Paul Wender. The second, neered the use of optical rotatory dispersion and made in 2011, is an interview with Chemistry Nobel circular dichroism in organic chemistry through Laureate Roger Kornberg. The third, made in 2014, research that spanned three decades into the mid- is a departmental celebration of Djerassi as a 1980s. He then moved to the study of magnetically nonagenarian, with introductions by my colleague, induced optical activity (magnetic circular dichro- Chemistry Nobel Laureate W. E. Moerner, and ism), which does not require intrinsic chirality. myself (see http://web.stanford.edu/group/Zarelab/ Djerassis group along with those of Biemann and Djerassi.html). McLafferty brought mass spectrometry to organic Djerassi, who was born in to Jewish chemistry in the early 1960s. Over a period of 30 parents, left Austria with his mother in 1939 to years, Djerassis group introduced mechanistic escape the Nazi regime and came to the USA interpretations of mass spectra that enormously almost penniless. In 1945, at the young age of 22, he expanded the use of the technique in structure completed his doctoral studies at the University of elucidation. In the 1960s, in a series of investiga- Wisconsin in only two and one-half years and tions (initially in collaboration with Joshua Leder- earned his PhD in organic chemistry. His thesis was berg and of Stanford Univer- on the transformation of testosterone to , sity), his group was the first to carry out research on which is a form of estrogen, a female sex hormone applications of computer-aided artificial intelli- produced by the ovaries. This would mark the gence techniques to chemical structure elucidation. beginning of his long-term interest in steroidal In 1972, Djerassi initiated his last major research compounds. In 1949, after working at the Swiss project, which was concerned with the structure company Ciba in Summit, , and synthe- elucidation, biosynthesis, and possible biological

&&&& 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Angew. Chem. Int. Ed. 2015, 54,2–4 Angewandte Chemie function of marine natural products. This work sition to the Vietnam war. As a person, he was a involved the isolation and structure determination visionary and his style was self-assured, self-pos- of around 150 marine . He certainly must be sessed, and unyielding, which brought more than regarded as among the greatest chemists ever to one chemistry department faculty meeting to an have been associated with the Chemistry Depart- abrupt close. Although he was a polarizing figure in ment at Stanford. the department, I count myself among his devoted Djerassis work has significantly benefitted admirers. In many ways Djerassi was a driven chemistry and will continue to do so for generations person. He always felt a longing for a home and for to come. This fact is all the more remarkable when acceptance among his peers, a topic that Jeff one remembers that throughout his career at Seeman has written poignantly about, see Chem. Stanford he only held a part-time appointment Eng. News 2013, 91(42), 10–14 and Angew. Chem. and continued to be quite active in industry. He was Int. Ed. 2014, 53, 3268–3279. Carl Djerassis legacy one of the founders of such companies as Zoecon, to chemistry has been truly immense. It is difficult which uses steroids for insect growth regulation, to expect to see the likes of such a giant of an and Affymax and Affymetrics, which make arrays individual, such a towering forceful intellect, ever for sequencing DNA. again. Djerassis contributions to chemistry have been monumental, but so far this recitation of his Richard N. Zare achievements fails to capture the complex Stanford University of this individual, a person who in 1973 received from President Nixon the National Medal of Science and was also named on Nixons black list DOI: 10.1002/anie.201501335 of enemies, which Djerassi attributed to his oppo-

Angew. Chem. Int. Ed. 2015, 54, 2 – 4 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim www.angewandte.org &&&& Angewandte. Obituary Obituary

Carl Djerassi died at the age of 91 on January 30, 2015. He is best known for R. N. Zare* &&&& — &&&& developing the synthetic hormone used to the present day in the oral contra- Carl Djerassi (1923–2015) ceptive commonly known as The Pill. Djerassi’s other achievements include the use of mass spectrometry in organic chemistry, and extensive research on antibiotics and marine natural products. He was also an author of plays, poems, and short stories, including Oxygen, writ- ten together with Roald Hoffmann.

&&&& www.angewandte.org 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Angew. Chem. Int. Ed. 2015, 54,2–4