1. WIEM: Wittig Georg wittig georg (18971987), chemik niemiecki. Profesor uniwersytetów w Tybindze (1944-1956)i Heidelbergu (1956-1967). Chemia, Niemcy wittig georg (1897-1987). http://wiem.onet.pl/wiem/0060c4.html

WIEM 2004 - zobacz now± edycjê encyklopedii! Kup abonament i encyklopediê na CD-ROM, sprawd¼ ofertê cenow±! Oferta specjalna abonamentów dla szkó³ i instytucji! Uwaga! Przedstawione poni¿ej has³o pochodzi z archiwalnej edycji WIEM 2001! Prace redakcyjne nad edycj± 2001 zosta³y zakoñczone. Zapraszamy do korzystania z nowej, codziennie aktualizowanej i wzbogacanej w nowe tre¶ci edycji WIEM 2004 Chemia, Niemcy Wittig Georg Wittig Georg (1897-1987), chemik niemiecki. Profesor uniwersytetów w Tybindze (1944-1956) i Heidelbergu (1956-1967). Bada³ zwi±zki organiczne boru i  fosforu , opracowa³ metodê syntezy alkenów ze zwi±zków karbonylowych i ylidów (tzw. reakcja Wittiga), wyja¶ni³ rolê wolnych rodników podczas polimeryzacji Nagroda Nobla w 1979 (wraz z  H.Ch. Brownem WIEM zosta³a opracowana na podstawie Popularnej Encyklopedii Powszechnej Wydawnictwa Fogra zobacz wszystkie serwisy do góry

2. Georg Wittig Translate this page wittig georg, Georg Wittig naquit le 16 juin 1897 à Berlin. Georg Wittig matérialisaprincipalement ses recherches à Tübingen et à Heidelberg. http://membres.lycos.fr/xjarnot/Chimistes/Wittig.html

W ittig Georg Les publications de Georg Wittig dans le domaine de la chimie se comptent par centaines. Parmi celles-ci, certaines ont conduit à la découverte de réactifs ou de réactions qui portent son nom. Citons en particulier, le réactif de Wittig : le tétraphénylborate de sodium [(C H B] Na N =CH A partir de 1953, date à laquelle fut publiée sa réaction, les distinctions honorifiques se succédèrent pour Georg Wittig à un rythme particulièrement soutenu. prix Otto Hahn (1967) prix K. Ziegler de la société chimique allemande (1975) la société chimique suisse (1963) la société chimique de Londres (1968) la Société chimique de France (1972) le prix Nobel de chimie pour la réaction Réaction de Wittig pour les cétones Wittig : prix Nobel de chimie en 1979 Pour tous problèmes ou remarques, écrivez au webmaster

3. Georg Wittig - Wikipedia, The Free Encyclopedia Printable version Disclaimers. Not logged in Log in Help. Other languagesDeutsch. Georg Wittig. From Wikipedia, the free encyclopedia. http://en.wikipedia.org/wiki/Georg_Wittig

Georg Wittig From Wikipedia, the free encyclopedia. Georg Wittig June 16 August 26 ) reported a method for synthesis of alkenes from aldehydes and ketones using compounds called phosphonium ylides . He won the Nobel Prize in Chemistry in This article is a stub . You can help Wikipedia by expanding it Categories Nobel Prize in Chemistry winners Views Article Discussion Edit History Personal tools Log in Navigation Main Page Community portal Current events Recent changes ... Donations Search Toolbox What links here Related changes Special pages Other languages Deutsch This page was last modified 03:58, 1 Jun 2004. All text is available under the terms of the GNU Free Documentation License (see for details). About Wikipedia

4. Georg Wittig - Wikipedia, The Free Encyclopedia Printable version Disclaimers. Not logged in Log in Help. Otherlanguages Deutsch. Georg Wittig. (Redirected from Wittig). Georg http://en.wikipedia.org/wiki/Wittig

Georg Wittig From Wikipedia, the free encyclopedia. (Redirected from Wittig Georg Wittig June 16 August 26 ) reported a method for synthesis of alkenes from aldehydes and ketones using compounds called phosphonium ylides . He won the Nobel Prize in Chemistry in This article is a stub . You can help Wikipedia by expanding it Categories Nobel Prize in Chemistry winners Views Article Discussion Edit History Personal tools Log in Navigation Main Page Community portal Current events Recent changes ... Donations Search Toolbox What links here Related changes Special pages Other languages Deutsch This page was last modified 03:58, 1 Jun 2004. All text is available under the terms of the GNU Free Documentation License (see for details). About Wikipedia

5. Georg Wittig Georg Wittig. Georg Wittig (1897 1987). German chemist whose methodof synthesizing olefins (alkenes) from carbonyl compounds is http://www.nobel-winners.com/Chemistry/georg_wittig.html

Georg Wittig Georg Wittig 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. Wittig was born in Berlin and studied at Kassel and Marburg. He was professor at Freiburg 1937-44, Tubingen 1944-56, and Heidelberg 1956-67. 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. Main Page About Us http://www.nobel-winners.com/

6. Georg Wittig - Encyclopedia Article About Georg Wittig. Free Access, No Registra Herbert C. Brown encyclopedia article about Herbert C. Brown. in 1979 (along with Georg wittig georg Wittig reported a method for synthesis ofalkenes from aldehydes and ketones using compounds called phosphonium ylides. http://encyclopedia.thefreedictionary.com/Georg Wittig

Dictionaries: General Computing Medical Legal Encyclopedia Georg Wittig Word: Word Starts with Ends with Definition Georg Wittig reported a method for synthesis of alkenes An alkene is a hydrocarbon that has a double bond between two carbon atoms. Alkenes are unsaturated substances. The generic formula is C n H . The simplest alkene is ethene (also known as ethylene Physical properties The same as alkanes. Physical state depends on molecular mass. Chemical properties Alkenes are relatively stable compounds, but are more reactive than alkanes. Click the link for more information. from aldehydes An aldehyde is either a functional group consisting of a terminal carbonyl group, or a compound containing a terminal carbonyl group. (Where -R represents the carbon chain.) Structure The aldehyde functional group is a carbonyl group bonded to a hydrogen atom and a carbon atom. Click the link for more information. and ketones A ketone is either the functional group characterized by a carbonyl group linked to two other carbon atoms or a compound that contains this functional group. A ketone can be generally represented by the formula: R (CO)R Among the other oxygen-containing compounds, the fact that ketones feature a carbonyl carbon bonded to two carbon atoms distinguishes them from carboxylic acids, aldehydes, esters, and amides. The double-bonded nature of the carbonyl group distinguishes ketones from alcohols and ethers. The smallest ketone is acetone:

7. Georg Wittig - Curriculum Vitae georg wittig – Curriculum Vitae. Ttranslation from the German text. To cite thisdocument, always state the source as shown above. georg wittig died in 1987. http://www.nobel.se/chemistry/laureates/1979/wittig-cv.html

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.

8. 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 a share (with Herbert C. Brown) of the Nobel Prize for Chemistry in 1979. wittig graduated from the University of Marburg in 1923, received his doctorate there in 1926, and remained as a 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.

9. Wittig, Georg. The Columbia Encyclopedia, Sixth Edition. 2001 The Columbia Encyclopedia, Sixth Edition. 2001. wittig, georg During his career, wittig was a professor at the universities of Braunschweig, Freiburg, Tübingen, and Heidelberg http://www.bartleby.com/65/wi/Wittig-G.html

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10. Herbert C. Brown And Georg Wittig 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 . 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 ]

11. Georg Wittig Winner Of The 1979 Nobel Prize In Chemistry georg wittig, a Nobel Prize Laureate in Chemistry, at the Nobel Prize Internet Archive. georg wittig. 1979 Nobel Laureate in Chemistry Links added by Nobel Internet Archive visitors. georg wittig Curriculum Vitae( submitted by Chinnappan Baskar http://www.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) Back to The Nobel Prize Internet Archive Literature Peace Chemistry ... Medicine We always welcome your feedback and comments

12. Georg Wittig - Nobel Lecture georg wittig – Nobel Lecture. Nobel Lecture, December 8, 1979. Herbert C. BrownAutobiography Nobel Lecture. georg wittig Curriculum Vitae Nobel Lecture. http://www.nobel.se/chemistry/laureates/1979/wittig-lecture.html

Nobel Lecture, December 8, 1979 From Diyls to Ylides to My Idyll The Lecture in pdf-format 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: SITE FEEDBACK CONTACT TELL A FRIEND Last modified April 7, 2004 The Official Web Site of The Nobel Foundation

13. Georg Wittig Winner Of The 1979 Nobel Prize In Chemistry georg wittig, a Nobel Prize Laureate in Chemistry, at the Nobel Prize InternetArchive. georg wittig. georg wittig information (submitted by Larry). 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) Back to The Nobel Prize Internet Archive Literature Peace Chemistry ... Medicine We always welcome your feedback and comments

14. Index Of Nobel Laureates In Chemistry Willstatter, Richard Martin, 1915. Windaus, Adolf Otto Reinhold, 1928. wittig,georg, 1979. Woodward, Robert Burns, 1965. Wüthrich, Kurt, 2002. Zewail, AhmedH, 1999. http://almaz.com/nobel/chemistry/alpha.html

ALPHABETICAL LISTING OF NOBEL PRIZE LAUREATES IN CHEMISTRY Name Year Awarded Agre, Peter Alder, Kurt Altman, Sidney Anfinsen, Christian B. ... Medicine We always welcome your feedback and comments

15. Wittig, Georg Search Biographies Bio search tips wittig, georg. wittig, georg 18971987 During his career, wittig was a professor at the universities of Braunschweig, Freiburg, Tübingen, and http://www.infoplease.com/ce6/people/A0852563.html

HOTWORDS CITE PRINT EMAIL in All Infoplease Almanacs Biographies Dictionary Encyclopedia Home Almanacs Atlas Dictionary ... D-Day Infoplease Tools Periodic Table Conversion Tool Perpetual Calendar Year by Year ... Site Map Also from Infoplease Search Infoplease Info search tips Search Biographies Bio search tips 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, Wittgenstein, Ludwig Josef Johann Witt, Jan de Related content from HighBeam Research on: Georg Wittig BASF: BASF funds guest professorship at the University of Heidelberg. (M2 Presswire) BASF: Japanese chemistry professor is awarded BASF's guest lectureship at the University of Heidelberg. (M2 Presswire) (book review) (Chemistry and Industry) (book reviews) (Chemistry and Industry) (Agence France Presse Spanish) NOBEL PRIZE IN CHEMISTRY LAUREATES (United Press International) Winners of the Nobel Prize in Chemistry. (United Press International) WINNERS OF THE NOBEL PRIZE IN CHEMISTRY (United Press International) (book reviews) (Chemistry and Industry) Nobel Prize in Che Search HighBeam Research for: About Contact ... Privacy Related sites:

16. Herbert C. Brown --  Britannica Student Encyclopedia , wittig, georg German chemist whose studies of organic phosphorus compounds wonhim a share (with Herbert C. Brown) of the Nobel Prize for Chemistry in 1979. http://www.britannica.com/ebi/article?eu=342973&query=boron nitride&ct=ebi

17. Wittig, Georg wittig, georg. wittig, georg 18971987, German chemist, Ph.D. Univ. of Marburg, 1926. During his career, wittig was a professor at the universities of Braunschweig, Freiburg, Tübingen, and Heidelberg. http://www.factmonster.com/ce6/people/A0852563.html

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, Wittgenstein, Ludwig Josef Johann Witt, Jan de Print this page Cite this page AD AD AD ADS Link to Fact Monster Add Fact Monster search to your site ... Privacy Brought to you by:

18. Georg Wittig History Top Home Historical Aspects of Chemistry. wittig, georg. In 1979,Herbert C. Brown and georg wittig were 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

19. Infoplease Search: Trakl Georg actor Birthplace Baltimore Born 1917 Died 1982wittig, georg F. K. ( Almanac People)wittig, georg F. K. chemist, Nobel laureate Birthplace Berlin, Germany Born more Graevius http://www.infoplease.com/search.php3?query=Trakl Georg

20. Wittig, Georg wittig, georg (18971987). German chemist whose method of synthesizingolefins (alkenes) from carbonyl compounds is a reaction often 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.

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