21. Georg Wittig 16 Juni 1897 In Berlin †... Zwischenprodukte von Georg Wittig. mehr zu Georg Wittig http://www.melifon.de/Georg Wittig

Georg Wittig "Georg Wittig" ( 16. Juni in Berlin 26. August in Heidelberg ) war ein deutscher Chemiker . Er sagte die Existenz des Dehydrobenzol s vorher (siehe Bild 1) Wittig entwickelte um das Jahr eine allgemein anwendbare Olefinsynthese (die nach ihm benannte Wittig-Reaktion ); daf¼r erhielt er im Jahre zusammen mit Herbert Charles Brown (der auf dem Gebiet der Borane arbeitete) den Nobelpreis f¼r Chemie Mit der Wittig-Reaktion wird unter anderem groŸtechnisch Vitamin A hergestellt. Im LabormaŸstab geh¶rt sie zu den wichtigsten Reaktionen zur Erzeugung von C=C-Doppelbindungen. Carbonylverbindungen und Phosphorylide werden dabei in einer Additions- Eliminierungssequenz miteinander umgesetzt Wittig, Georg Wittig, Georg Home Index (Ge) Original, History and Authors: de-wikipedia-org/wiki/Georg Wittig Versionsgeschichte Artikel bearbeiten Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation. A copy of the license is included in the section entitled "GNU Free Documentation License" P¤dagogik im Atomzeitalter von Peter Kern Hans-Georg Wittig mehr zu: Georg Wittig

22. Georg Wittig - Encyklopedia Georg Wittig. Z Wikipedii, wolnej encyklopedii. enGeorg Wittig?deGeorg Wittig?Georg Wittig (16 czerwca 1897 26 sierpnia 1987), chemik niemiecki, http://encyklopedia.korba.pl/wiki/Georg_Wittig

Startuj z Nami! Dodaj do ulubionych Korba.pl Polski internet ... Encyklopedia Szukaj w encyklopedi: Kategorie stron Niemcy (biografie) Chemicy Nobliści - chemia Georg Wittig Z Wikipedii, wolnej encyklopedii. en:Georg Wittig de:Georg Wittig Georg Wittig 16 czerwca 26 sierpnia ), chemik niemiecki , laureat Nagrody Nobla Był profesorem uniwersytet³w w Tybindze ) i Heidelbergu ) oraz członkiem wielu towarzystw naukowych, m.in. Akademii Nauk w Heidelbergu, Akademii Przyrodnik³w w Halle , Akademii Nauk w Nowym Jorku Opracował m.in. metodę syntezy alken³w ze zwiÄ zk³w karbonylowych, nazwanÄ reakcjÄ Wittiga . Za badania dotyczÄ ce zastosowania zwiÄ zk³w boru i fosforu w syntezach organicznych został uhonorowany NagrodÄ NoblÄ w dziedzinie chemii w , razem z Amerykaninem Herbertem C. Brownem Źr³dła: Beata Tarnowska (red.), Nagrody Nobla. Leksykon PWN , Warszawa 2001 Źr³dło: " http://encyklopedia.korba.pl/wiki/Georg_Wittig Tę stronę obejrzano 3 razy; Tę stronę ostatnio zmodyfikowano o 18:49, 16 cze 2005; Content is available under GNU Free Documentation License 1.2

23. Georg Wittig Winner Of The 1979 Nobel Prize In Chemistry georg wittig, a Nobel Prize Laureate in Chemistry, at the Nobel Prize Internet Archive. http://almaz.com/nobel/chemistry/1979b.html

G EORG W ITTIG 1979 Nobel Laureate in Chemistry for their development of the use of boron- and phosphorus-containing compounds, respectively, into important reagents in organic synthesis. Background Residence: Germany Affiliation: University of Heidelberg Featured Internet Links Prize Co-recipient: Herbert C. Brown Search WWW Search The Nobel Prize Internet Archive Links added by Nobel Internet Archive visitors Georg Wittig – Curriculum Vitae (submitted by Chinnappan Baskar June in Chemistry (submitted by Chinnappan Baskar The Wittig Reaction (submitted by Thomas Georg Wittig - Nobel Lecture (submitted by Davis) Georg Wittig (Biochemistry, Biographies) (submitted by Jackson) Georg Wittig - information (submitted by Larry) their development of the use of boron- and phosphorus-containing compounds, respectively, into important reagents in organic synthesis. (submitted by Alex CS) Back to The Nobel Prize Internet Archive Literature Peace Chemistry ... Medicine We always welcome your feedback and comments

24. Georg Wittig In 1967, he won the Otto Hahn Prize. In 1979, Herbert C. Brown and georg Wittigwere jointly awarded the Nobel Prize http://orac.sunderland.ac.uk/~hs0bcl/h_gw.htm

History Top Home Historical Aspects of Chemistry Wittig, Georg German chemist, Nobel Prizewinner 1979 for the Wittig Reaction Born: Berlin, 16 June, 1897 Died: 26 August, 1987 Wittig discovered his versatile route to alkenes via ylide molecules - the Wittig reaction - in 1949. In 1967, he won the Otto Hahn Prize. In 1979, Herbert C. Brown and Georg Wittig were jointly awarded the Nobel Prize: for their development of the use of boron- and phosphorus-containing compounds, respectively, into important reagents in organic synthesis. See this page at Heidelberg for a picture and some more biographical details (in German). History top Home Ol' Spidey : page last changed 5 April 1997

25. The Wittig Reaction georg wittig well deserved his Nobel Prize in 1979 and is a hero of mine becausehe was a doddering 56 years old when he discovered this very versatile http://orac.sunderland.ac.uk/~hs0bcl/org8.htm

Prev page Next page Teaching top Home How to Tackle Organic Syntheses - A Beginner's Guide by Prof Otto Meth-Cohn The Wittig Reaction Georg Wittig well deserved his Nobel Prize in 1979 - and is a hero of mine because he was a doddering 56 years old when he discovered this very versatile reaction. The idea is very simple - as are all good ideas. Phosphorus is a second row element - in Group 5 - like nitrogen - but unlike nitrogen can expand its valency from 3 to 4, 5, or even 6. The stable 5 valency is met in compounds like phosphoric acid and PCl . What Wittig discovered was that phosphines (the P equivalent of amines) easily form phosphonium salts with alkyl halides and that these salts readily lose HX with a strong base. The product is called an ylide or a phosphorane . The ylide is a very polar molecule with a carbanionic carbon (aren't carbanions useful?!). How to make a phosphorus ylide This ylide reacts enthusiastically with an aldehyde or ketone to give an alkene. How to make an alkene using the Wittig reaction You'll notice that the reaction involves formation of a 4-membered ring intermediate and that the very stable phosphine oxide is a by-product. The great thing for hard-pressed student synthesizers is that the alkene is made up by linking an aldehyde or ketone to an alkyl halide replacing the O and the halide by a double bond. Just snip the alkene at the double bond and make one half an aldehyde or ketone and the other half an alkyl halide.

26. Wittig, Georg wittig, georg. (b. June 16, 1897, Berlin, Ger.d. Aug. 26, 1987, Heidelberg,W.Ger.), German chemist whose studies of organic phosphorus compounds won him http://www.britannica.com/nobel/micro/642_94.html

Wittig, Georg (b. June 16, 1897, Berlin, Ger.d. Aug. 26, 1987, Heidelberg, W.Ger.), German chemist whose studies of organic phosphorus compounds won him a share (with Herbert C. Brown ) of the Nobel Prize for Chemistry in 1979. In investigating reactions involving carbanions, negatively charged organic species, Wittig discovered a class of organic phosphorus compounds called ylides that mediate a particular type of reaction that became known as the Wittig reaction. This reaction proved of great value in the synthesis of complex organic compounds such as vitamins A and D , prostaglandins, and steroids.

27. Wittig, Georg --  Britannica Student Encyclopedia wittig, georg (1897–1987), German chemist, born in Berlin; on faculty of Universityof Marburg 1926–32, Technical College of Braunschweig 1932–37, http://www.britannica.com/ebi/article-9340700

Home Browse Newsletters Store ... Subscribe Already a member? Log in This Article's Table of Contents Wittig, Georg Print this Table of Contents Shopping Price: USD $1495 Revised, updated, and still unrivaled. The Official Scrabble Players Dictionary (Hardcover) Price: USD $15.95 The Scrabble player's bible on sale! Save 30%. Merriam-Webster's Collegiate Dictionary Price: USD $19.95 Save big on America's best-selling dictionary. Discounted 38%! More Britannica products Wittig, Georg Student Encyclopedia Article Page 1 of 1 var mm = [["Jan.","January"],["Feb.","February"],["Mar.","March"],["Apr.","April"],["May","May"],["June","June"],["July","July"],["Aug.","August"],["Sept.","September"],["Oct.","October"],["Nov.","November"],["Dec.","December"]]; To cite this page: MLA style: "Wittig, Georg." Britannica Student Encyclopedia http://www.britannica.com/ebi/article-9340700 APA style: Wittig, Georg. ( Britannica Student Encyclopedia . Retrieved http://www.britannica.com/ebi/article-9340700

28. Georg Wittig wittig, georg (The Columbia Encyclopedia, Sixth Edition). wittig, georg (18971987) (TheHutchinson Dictionary of Scientific Biography) http://www.infoplease.com/ce6/people/A0852563.html

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29. FECS Millennium Project - Wittig wittig, georg Born Berlin (Germany), 1897 Died Heidelberg (Germany), 1987.wittig studied in Tübingen and Marburg. In 1932 he became professor in http://www.chemsoc.org/networks/enc/FECS/Wittig.htm

FECS Millennium Project 100 Distinguished European Chemists 20th Century Wittig, Georg Born: Berlin (Germany), 1897 Died: Heidelberg (Germany), 1987 Links www.nobel.se/chemistry/laureates/1979/index.html http://www.nobelprizes.com/nobel/chemistry/1979b.html http://orac.sunderland.ac.uk/~hs0bcl/h_gw.htm http://orac.sunderland.ac.uk/~hs0bcl/org8.htm For further information on this chemist search the RSC's historical chemistry information service provided by the Library and Information Centre Go to 20th Century Chemists About ENC FECS ... Visit chemsoc, the RSC’s chemical science network

30. Wittig, Georg. The Columbia Encyclopedia, Sixth Edition. 2001-05 wittig, georg. The Columbia Encyclopedia, Sixth Edition. 200105. http://www.bartleby.com/65/wi/Wittig-G.html

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31. Georg Wittig wittig, georg, 1897–1987, German chemist, Ph.D. Univ. of Marburg, 1926. During hiscareer, wittig was a professor at the universities of Braunschweig, http://www.factmonster.com/ce6/people/A0852563.html

Home U.S. People Word Wise ... Homework Center Fact Monster Favorites Hurricane Katrina Ramadan Children Inventors The Doctor's In ... 2006 TFK Almanac Reference Desk Atlas Almanacs Dictionary Encyclopedia ... Encyclopedia Wittig, Georg Wittig, Georg, Brown for his discovery of a class of compounds, ylides, that substantially facilitate the synthesis of certain organic compounds. The Columbia Electronic Encyclopedia, Page Tools: Cite Print More on Georg Wittig from Fact Monster: Herbert Charles Brown Information Please: 1979 - Vietnam and Vietnam-backed Cambodian insurgents announce fall of Cambodian capital Phnom Penh and ... Nobel Prizes (table) - Encyclopedia Nobel Prizes Year Peace Chemistry Physics Physiology or Medicine Literature 1901 J. H. ... See more Encyclopedia articles on: Biochemistry: Biographies AD AD AD ADS Business Cards Link to Fact Monster Add Fact Monster search ... Privacy Brought to you by: Information Please

32. MSN Encarta - Georg Wittig wittig, georg (18971987), German organic chemist and Nobel laureate. wittig sdiscoveries are important in chemical synthesis, the formation of http://encarta.msn.com/encyclopedia_761583409/Georg_Wittig.html

MSN Home My MSN Hotmail Shopping ... Sign In Web Search: Encarta Subscriber Sign In Help Home ... Upgrade your Encarta Experience Search Encarta Subscription Article MSN Encarta Premium: Get this article, plus 60,000 other articles, an interactive atlas, dictionaries, thesaurus, articles from 100 leading magazines, homework tools, daily math help and more for $4.95/month or $29.95/year (plus applicable taxes.) Learn more. This article is exclusively available for MSN Encarta Premium Subscribers. Already a subscriber? Sign in above. Wittig, Georg Wittig, Georg (1897-1987), German organic chemist and Nobel laureate. Wittig's discoveries are important in chemical synthesis, the formation of... Related Items see also Nobel Prizes Multimedia Selected Web Links Georg Wittig [Nobel Foundation] 1 item Want more Encarta? Become a subscriber today and gain access to: Daily Math Help Literature Guides Researcher Tools Paper-Writing Guides 60,000 + articles Interactive Atlas Magazine Center Find more about Wittig, Georg from Related Items Other Features from Encarta Nobel Prizes Search Encarta for Wittig, Georg

33. MSN Encarta - Search Results - Georg Cantor georg wittig ( The Nobel Foundation) georg wittig ( The Nobel Foundation) *georg wittig georg von Békésy ( The Nobel Foundation) georg von Békésy ( The http://encarta.msn.com/Georg_Cantor.html

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34. Wittig, Georg wittig, georg (18971987) wittig was born in Berlin and studied at Kasseland Marburg. In the wittig reaction, which he first demonstrated 1954, http://www.cartage.org.lb/en/themes/Biographies/MainBiographies/W/Wittig/1.html

Wittig, Georg German chemist whose method of synthesizing olefins (alkenes) from carbonyl compounds is a reaction often termed the Wittig synthesis. For this achievement he shared the 1979 Nobel Prize for Chemistry. In the Wittig reaction, which he first demonstrated 1954, a carbonyl compound (aldehyde or ketone) reacts with an organic phosphorus compound, an alkylidenetriphenylphosphorane, (C6H5)3P=CR2, where R is a hydrogen atom or an organic radical. The alkylidene group (=CR2) of the reagent reacts with the oxygen atom of the carbonyl group to form a hydrocarbon with a double bond, an olefin (alkene). In general: (C6H5)3P=CR2 + R2'CO (C6H5)3PO + R2C=CR2 The reaction is widely used in organic synthesis, for example to make squalene (the synthetic precursor of cholesterol) and vitamin D3.

35. Nobel Laureates In Chemistry By Alphabetical Order Willstatter, Richard Martin, 1915. Windaus, Adolf Otto Reinhold, 1928. wittig,georg, 1979. Woodward, Robert Burns, 1965. Zewail, Ahmed H, 1999 http://www.cartage.org.lb/en/themes/Sciences/Chemistry/Aboutchemistry/AlphaNobel

Themes Science Chemistry About Chemistry Generalities Name Year Awarded Alder, Kurt Altman, Sidney Anfinsen, Christian B. Arrhenius, Svante August Aston, Francis William Baeyer, Johann Friedrich Wilhelm Adolf Von Barton, Sir Derek H. R. Berg, Paul Bergius, Friedrich Bosch, Carl Boyer, Paul D. Brown, Herbert C. Buchner, Eduard Butenandt, Adolf Friedrich Johann Calvin, Melvin Cech, Thomas R. Corey, Elias James Cornforth, Sir John Warcup Cram, Donald J. Crutzen, Paul Curie, Marie Curl, Robert F., Jr. Debye, Petrus Josephus Wilhelmus De Hevesy, George Deisenhofer, Johann Diels, Otto Paul Hermann Eigen, Manfred Ernst, Richard R. Euler-chelpin, Hans Karl August Simon Von Fischer, Ernst Otto Fischer, Hans Fischer, Hermann Emil Flory, Paul J. Fukui, Kenichi Giauque, William Francis Gilbert, Walter Grignard, Victor Haber, Fritz Hahn, Otto Harden, Sir Arthur Hassel, Odd Hauptman, Herbert A. Haworth, Sir Walter Norman Heeger, Alan J. Herschbach, Dudley R. Herzberg, Gerhard Heyrovsky, Jaroslav Hinshelwood, Sir Cyril Norman Hodgkin, Dorothy Crowfoot Hoff, Jacobus Henricus Van't

36. Wittig, Georg Friedrich Karl georg wittig and Herbert C. Brown. Link icon georg wittig. Nobel Laureate inChemistry. Link icon Historical Aspects of Chemistry georg wittig http://www.euchems.org/Distinguished/20thCentury/wittiggeorg.asp

Contact us Home 100 Distinguished 20th Century Wittig, Georg Friedrich Karl Wittig, Georg Friedrich Karl (1897-1987) 20th Century Born: Berlin (Germany), 1897 Died: Heidelberg (Germany), 1987 Wittig studied in Tübingen and Marburg. In 1932 he became professor in Braunschweig, in 1937 in Freiburg, in 1944 in Tübingen, in 1956 in Heidelberg. He did research on the stability and the reactions of organic radicals and on the course of those reactions in unsaturated systems. Starting from lithiumphenyl he synthesised ylides. In connection with those investigations he introduced compounds of boron and phosphorous into organic synthesis. In 1979 together with Herbert C. Brown he was awarded the Nobel Prize. Related Links The Nobel Prize in Chemistry 1979 Georg Wittig and Herbert C. Brown Georg Wittig Nobel Laureate in Chemistry Historical Aspects of Chemistry: Georg Wittig German chemist, Nobel Prizewinner 1979 for the Wittig Reaction How to Tackle Organic Syntheses - A Beginner's Guide by Prof Otto Meth-Cohn The Wittig Reaction External links will open in a new browser window Main Links About EuCheMS News Sponsored Events Divisions ... Younger Chemists' Groups in Europe © EuCheMS 2005

37. Georg Wittig - Curriculum Vitae georg wittig – Curriculum Vitae. Ttranslation from the German text. Born in Berlinin 1897. georg wittig died on August 26, 1987. http://nobelprize.org/chemistry/laureates/1979/wittig-cv.html

HOME SITE HELP ABOUT SEARCH ... EDUCATIONAL Ttranslation from the German text Scientific Activities Textbook on stereochemistry, 1930. Papers on the subject of ring tension and double bonds as well as valency tautomerism. Main research into organic reactions of alkali metals and elaboration of carbon-based chemistry. Discovery of the halogen-metal exchange reaction (simultaneously with H. Gilman). Development of ylide chemistry and, together with that, study of the Stevens and Sommelet rearrangements as well as intra-anionic ether isomerisation. Through the synthesis of the pentaaryl derivatives of the elements of group 5, the phosphorous ylides were discovered and also, in 1953, the carbonylolefins which have since proven to be crucial for the manufacture of synthetic fabrics and also important in other industrial processes. In 1942 dehydrobenzol was proven to be a shortlived by-product, a fact demonstrated bye. D. Roberts in 1953 and by me, only this time using different means, viz. control experiments on Diels - Alder adducts. More recently the concept of the "at"-complexes as a counterpart to the "onium" complexes has led to the development of a new chemistry from which have come the sodium tetra phenylborates.

38. Georg Wittig - Nobel Lecture georg wittig – Nobel Lecture. Nobel Lecture, December 8, 1979 Autobiography Nobel Lecture Other Resources georg wittig Curriculum Vitae http://nobelprize.org/chemistry/laureates/1979/wittig-lecture.html

HOME SITE HELP ABOUT SEARCH ... EDUCATIONAL Nobel Lecture, December 8, 1979 From Diyls to Ylides to My Idyll The Lecture in Text Format Pdf 106 kB From Nobel Lectures, Chemistry 1971-1980 , Editor-in-Charge Tore Frängsmyr, Editor Sture Forsén, World Scientific Publishing Co., Singapore, 1993 In order to read the text you need Acrobat Reader The Nobel Prize in Chemistry 1979 Press Release Presentation Speech ... Nobel Lecture The 1979 Prize in: Physics Chemistry Physiology or Medicine Literature ... Economic Sciences Find a Laureate: Nobelprize.org Get to know all 770 Prize Winners! » Games and Simulations » SITE FEEDBACK ... TELL A FRIEND Last modified April 14, 2005

39. Wittig Reaction - Wikipedia, The Free Encyclopedia The wittig reaction was discovered1 in 1954 by georg wittig, for which he wasawarded the Nobel Prize in Chemistry in 1979. It is widely used in organic http://en.wikipedia.org/wiki/Phosphonium_ylide

40. Herbert C. Brown And Georg Wittig To see pictures of HC Brown and georg wittig please go to . A biography inEnglish on georg wittig is at the following web address . http://www.brynmawr.edu/Acads/Chem/mnerzsto/brownwittig.htm

Herbert C. Brown and Georg Wittig Our chemists of the week are Herbert C. Brown and Georg Wittig. We are studying some of their work this week . They jointly won the Nobel Prize in chemstry in 1979. To see pictures of H.C. Brown and Georg Wittig please go to.... http://nobel.sdsc.edu/laureates/chemistry-1979.html A biography in English on Georg Wittig is at the following web address.... http://nobel.sdsc.edu/laureates/chemistry-1979-2-cv.html A more detailed biography in French can be found at http://www.multimania.com/xjarnot/Chimistes/Wittig.html I can barely remember my French, but I could follow sections of it. An autobiography by HC Brown can be found at http://nobel.sdsc.edu/laureates/chemistry-1979-1-autobio.html [ B a c k t o H i s t o r y o f C h e m i s t r y ]

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