23 July 1906|
Sarajevo, Bosnia and Herzegovina, Austria-Hungary
|Died||7 January 1998
|Institutions||Czech Institute of Technology
University of Zagreb
|Alma mater||Czech Technical University in Prague|
|Doctoral advisor||Emil Votoček|
|Known for||Organic chemistry
|Notable awards||Nobel Prize for Chemistry (1975)|
|Spouse||Kamila Prelog (née Vitek)|
Vladimir Prelog FRS (23 July 1906 – 7 January 1998) was a Croatian-Swiss organic chemist, winner of the 1975 Nobel Prize for chemistry. Prelog lived and worked in Prague, Zagreb and Zürich during his lifetime.
Early life 
Prelog was born in Sarajevo, Condominium of Bosnia and Herzegovina, at that time within the Austro-Hungarian Empire, to Croat parents who were working there. His father Milan was a history professor in gymnasium in Sarajevo and later at the University of Zagreb. As an 8-year old boy, he stood near the place where the assassination of Franz Ferdinand occurred. Prelog attended elementary school in Sarajevo, but in 1915, as a child, Prelog moved to Zagreb (Croatia) with his parents. In Zagreb he graduated from elementary school. At first he attended gymnasium in Zagreb, but soon afterwards, his father got a job in Osijek, so he continued his education there. He spent two years in Osijek gymnasium, where he became interested in chemistry under the influence of his professor Ivan Kuria. In 1922, as a 16-year old boy, he described a new solution for an analytic instrument in chemical lab for the prominent German scientific magazine Chemiker Zeitung. His description was published, which was his first scientific work. Prelog completed his high school education in Zagreb in 1924. Following his father's wishes, he moved to Prague where he received his diploma in chemical engineering from the Czech Technical University in 1928 and gained a Sc.D in 1929. His teacher was Emil Votoček, while his assistant and mentor Rudolf Lukeš introduced him to the world of organic chemistry.
No academic positions were available because of the Great Depression so instead he started to work in the private plant laboratory of G.J. Dríza in Prague, in charge of the production of rare chemicals that were not available on the market at that time. He worked for Driza from 1929 until 1935. During the time, he got his first doctoral candidate, a company owner Driza. In 1933, he married Kamila Vitek.His pastime was spent in his own research, where he started investigating alkaloids from the cacao bark.
Prelog badly wanted to work in academic environment, so he accepted the position of lecturer at the University of Zagreb in 1935. At Technical Faculty in Zagreb, he lectured organic chemistry and chemical engineering.
With the help of collaborators and students, and financially sponsored by the pharmaceutical factory "Kaštel" (currently Pliva), he started researching quinine and its compounds. Final works with the industry yielded a financially successful production of Streptazol, one of the first commercial sulfonamides.
The results of Prelog's work have been published in the top European chemical literature and journals, while the organic chemistry developed in Zagreb at that time was well known and identifiable around the world.
After World War II broke out, in 1941 Prelog was invited to lecture in Germany by Richard Kuhn, and shortly afterwards, Lavoslav Ružička, whom he asked for help, invited Prelog to visit him on his way to Germany. He and his wife used those invitations to escape to Zürich in Switzerland. With Ružička's help, he gained support from CIBA Ltd. and started to work in the Organic Chemistry Laboratory in the Swiss Federal Institute of Technology (ETH, or Eidgenössische Technische Hochschule). Prelog was able to separate the chiral enantiomers of Tröger's base in 1944 by chromatography on an optically active substrate. With thischiral resolution, he was able to prove that not only carbon but also nitrogen atoms can be the chiral centre in a molecule, which had been speculated for several years. His relationship with Ružička helped him climb up the academic hierarchical ladder. Starting as an assistant, he become Privat-Dozent, Titularprofessor, associate professor, and in 1952 full professor. In 1957 he succeeded Ružička as head of the Laboratory. Since Prelog disliked administrative duties, he implemented rotating chairmanship in the ETH. Prelog joined the ETH at the right time, since Ružička's Jewish co-workers left the country and went to the United States, so Prelog filled the vacuum they left.
Prelog's main interest was focused on alkaloids. He found an ideal topic in the elucidation of the structure of solanin; he continued his work on Cinchona alkaloids and started to investigate strychnine. He showed that Robert Robinson's formula for strychnine was not correct. Although the formula he proposed was also not the right one, the discovery increased his international prestige. Later he worked on elucidating the structures of aromatic Erythrina alkaloids and, together with Derek Barton, Oskar Jeger and Robert Burns Woodward, of cevin, which was his last project on alkaloid chemistry.
At mid-century, the instrumental revolution necessitated a new approach to structural elucidation. Purely chemical methods had become outdated and had lost some of their intellectual appeal. Recognizing the growing importance of microbial metabolities, Prelog started working on these compounds, which possess unusual structures and interesting biological properties. It led him into antibiotics, and he subsequently elucidated the structures of such compounds as nonactin, boromycin, ferrioxamins, and rifamycins. For Prelog, natural products represented more than a chemical challenge. He considered them a record of billions of years of evolution.
In 1944 at the ETH, Prelog managed to separate enantiomers with "asymmetric" trivalent nitrogen by column chromatography at a time when this method was still in its infancy. His work on medium-sized alicyclic and heterocyclic rings established him as a pioneer in stereochemistry and conformational theory and brought an invitation to give the first Centenary Lecture of the Chemical Society in London in 1949. He synthesized medium-sized ring compounds with 8 to 12 members from dicraboxylic acid esters by acylion condensation and explained their unusual chemical reactivity by a "nonclassical" strain because of energetically unfavorable conformations. He also contributed to the understanding of Bredt's rule by showing that a double bond may occure at the bridgehead if the ring is large enough.
In his research of asymmetric syntheses, Prelog studied enantioselective reactions and established rules for the relationship between configuration of educts and products. From Prelog's researches into the stereospecificity of microbiological reductions of alicyclic ketones and the enzymic oxidation of alcohols, he contributed not only to the knowledge of the mechanism of stereospecificity of enzymic reactions in general but also to the structure of the active site of the enzyme.
Specifying the growing number of stereoisomers of organic compounds became for Prelog one of his important aims. In 1954 he joined R. S. Cahn and Christopher Ingold in their efforts to build a system for specifying a particular stereoisomers by simple and unambiguous descriptors that could be easily assigned and deciphered: The CIP system (Cahn-Ingold-Prelog) was developed for defining absolute configuration using "sequence rules". Together they published two papers. After Cahn and Ingold died, Prelog published a third paper on the topic.
In 1959, Prelog gained Swiss citizenship.
Thanks to him and Ružička, Zürich has become one of the most significant centers of modern organic chemistry.
Nobel Prize 
Prelog received the 1975 Nobel Prize in Chemistry for his research into the stereochemistry of organic molecules and reaction, sharing it with the Australian/British research chemist John Cornforth.
His scientific opus encompasses more than 400 works. Lecturer of distinctive style and eloquence, he trained many generations of chemists. In 1986, he became an honorary member of the Croatian Academy of Sciences and Arts.
Private life 
As a private person, he was the source of anecdotes about almost all eminent chemists all over the world. An intellectual with a wide cultural background, he never insisted on authority and was unaccustomed to confrontation. As an introspective person, ironic and suspicious of high social, political or religious aspirations, Prelog rarely allowed people insight into his inner life. He was one of the 109 Nobel Prize winners who signed the peace appeal for Croatia in 1991.
Vladimir Prelog died in Zürich, at the age of 91. An urn containing Prelog's ashes was ceremoniously interred at the Mirogoj cemetery in Zagreb on September 27, 2001. In 2008, a memorial to Prelog was unveiled in Prague.
- Arigoni, D.; Dunitz, J. D.; Eschenmoser, A. (2000). "Vladimir Prelog. 23 July 1906--7 January 1998: Elected For.Mem.R.S. 1962". Biographical Memoirs of Fellows of the Royal Society 46: 443. doi:10.1098/rsbm.1999.0095.
- Dunitz, J. D. (1998). Nature 391 (6667): 542. doi:10.1038/35279.
- Mislow, K. (2000). "Vladimir Prelog, 23 July 1906 · 7 January 1998". Proceedings of the American Philosophical Society 144 (1): 106–111. doi:10.2307/1515610. JSTOR 1515610.
- Kauffman, G. B. (1998). "In Memoriam Vladimir Prelog (1906-1998): Some Personal Reminiscences". The Chemical Educator 3 (2): 1–0. doi:10.1007/s00897980200a.
- Hargittai, I. N.; Hargittai, B. (2006). "Prelog Centennial: Vladimir Prelog (1906–1998)". Structural Chemistry 17: 1. doi:10.1007/s11224-006-9000-x.
- James 1993, p. 578.
- Frängsmyr & Forsén 1993, p. 201.
- Prelog, V.; Wieland, P. (1944). "Über die Spaltung der Tröger'schen Base in optische Antipoden, ein Beitrag zur Stereochemie des dreiwertigen Stickstoffs". Helvetica Chimica Acta 27: 1127. doi:10.1002/hlca.194402701143.
- Frängsmyr & Forsén 1993, p. 202.
- James 1993, p. 580.
- James 1993, p. 580-581.
- James 1993, p. 581.
- Rezende 2006, p. 352.
- James 1993, p. 571.
- Spomenik Prelogu u Pragu
- Frängsmyr, Tore; Forsén, Sture (1993). Chemistry, 1971-1980. World Scientific. ISBN 981-02-0786-7.
- James, Laylin K. (2006). Nobel Laureates in Chemistry, 1901-1992. American Chemical Society & Chemical Heritage Foundation. ISBN 0-8412-2459-5.
- Rezende, Lisa (2006). Chronology of Science. Infobase Publishing. ISBN 0-8160-5342-1.
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