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Wittig Georg:     more detail

Wittig Chemistry: Topics in Current Chemistry by H. J. Bestmann, 1983-07 Tu Braunschweig Faculty: Richard Dedekind, Kurt Tank, Manfred Eigen, Georg Wittig, Nikolaus Hofreiter, Henning Kagermann, Herbert Freundlich Ueber Die Termische Veranderlichkeit Des Daniellschen Elements Und Des Accumulators (INAUGURAL-DISSERTATION ZUR ERLANGUNG DER PHILOSOPHISCHEN DOCTORWURDE VORGELEGT DER HOHEN PHILOSOPHISCHEN FACULTAT DER GEORG-AUGUSTS-UNIVERSITAT ZU GOTTINGEN, GERMAN LANGUAGE, GERMANY) by GEORG MEYER, 1888 Jahrbuch der Akademie der Wissenschaften in Gottingen (fur das Jahr 1965) by Oskar Glemser, Heinrich Matthaei, et all 1966 Electromagnetische Rotationserscheinungen Flussiger Leiter (INAUGURAL-DISSERTATION ZUR ERLANGUNG DER DOKTORWURDE EINER HOHEN PHILOSOPHISCHEN FACULTAT DER GEORG-AUGUSTS-UNIVERSITAT ZU GOTTINGEN, GERMAN LANGUAGE, GERMANY) by FRIEDRICH SCHUMANN, 1887

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

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
    
    Extractions: Kategorie stron Niemcy (biografie) Chemicy Nobliści - chemia 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 związk³w karbonylowych, nazwaną reakcją Wittiga . Za badania dotyczące zastosowania związk³w boru i fosforu w syntezach organicznych został uhonorowany Nagrodą Noblą w dziedzinie chemii w , razem z Amerykaninem Herbertem C. Brownem Źr³dła: 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

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
    
    Extractions: 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
    
    Extractions: 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
    
    Extractions: (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
    
    Extractions: 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 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

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
    
    Extractions: google_ad_client = 'pub-1894504138907931'; google_ad_width = 120; google_ad_height = 240; google_ad_format = '120x240_as'; google_ad_type = 'text'; google_ad_channel =''; google_color_border = ['336699','B4D0DC','DFF2FD','B0E0E6']; google_color_bg = ['FFFFFF','ECF8FF','DFF2FD','FFFFFF']; google_color_link = ['0000FF','0000CC','0000CC','000000']; google_color_url = ['008000','008000','008000','336699']; google_color_text = ['000000','6F6F6F','000000','333333']; 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

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

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
    
    Extractions: Select Search All Bartleby.com All Reference Columbia Encyclopedia World History Encyclopedia Cultural Literacy World Factbook Columbia Gazetteer American Heritage Coll. Dictionary Roget's Thesauri Roget's II: Thesaurus Roget's Int'l Thesaurus Quotations Bartlett's Quotations Columbia Quotations Simpson's Quotations Respectfully Quoted English Usage Modern Usage American English Fowler's King's English Strunk's Style Mencken's Language Cambridge History The King James Bible Oxford Shakespeare Gray's Anatomy Farmer's Cookbook Post's Etiquette Bulfinch's Mythology Frazer's Golden Bough All Verse Anthologies Dickinson, E. Eliot, T.S. Frost, R. Hopkins, G.M. Keats, J. Lawrence, D.H. Masters, E.L. Sandburg, C. Sassoon, S. Whitman, W. Wordsworth, W. Yeats, W.B. All Nonfiction Harvard Classics American Essays Einstein's Relativity Grant, U.S. Roosevelt, T. Wells's History Presidential Inaugurals All Fiction Shelf of Fiction Ghost Stories Short Stories Shaw, G.B. Stein, G. Stevenson, R.L. Wells, H.G. Reference Columbia Encyclopedia PREVIOUS NEXT ... BIBLIOGRAPHIC RECORD The Columbia Encyclopedia, Sixth Edition. Wittig, Georg

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
    
    Extractions: Reference Desk 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, AD AD AD ADS Business Cards Link to Fact Monster Add Fact Monster search ... Privacy

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
    
    Extractions: 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: 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
    
    Extractions: fdbkURL="/encnet/refpages/search.aspx?q=Georg+Cantor#bottom"; errmsg1="Please select a rating."; errmsg2="Please select a reason for your rating."; Web Search: Encarta Home ... Upgrade your Encarta Experience Search Encarta Exclusively for MSN Encarta Premium Subscribers. Join Now Searched Encarta for ' Georg Cantor' Articles Georg Cantor Cantor, Georg (1845-1918), German mathematician, born in Saint Petersburg. He taught at the University of Halle and was professor there after 1872.... ... , branch of mathematics, first given formal treatment by the German mathematician Georg Cantor in the 19th century. The set concept is one... See all search results in Articles (58) Georg Cantor Georg Wittig Georg von B©k©sy Georg von Hevesy ... Map of Cantor Seamount See all search results in Maps (4) Books about "Georg Cantor" Search for books about your topic, "Georg Cantor" Magazines Search for Magazine Articles on " ... Learn more. Go to Magazine Center MSN Encarta Premium Get more results for "Georg Cantor" 29 results on MSN Encarta 72 results on MSN Encarta Premium Click here to join today!

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
    
    Extractions: 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:

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
    
    Extractions: 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
    
    Extractions: 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. Georg Wittig and Herbert C. Brown Nobel Laureate in Chemistry German chemist, Nobel Prizewinner 1979 for the Wittig Reaction The Wittig Reaction

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
    
    Extractions: 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

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

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