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Karl Von Auwers
Karl Friedrich von Auwers (September 16, 1863 – May 3, 1939) was a German chemist, and was the academic adviser of both Karl Ziegler and Georg Wittig at the University of Marburg. Life Karl Friedrich von Auwers was born the son of the renowned astronomer Arthur Auwers on in Gotha (town), Gotha, Germany. He studied at first at the University of Heidelberg and later with August Wilhelm von Hofmann at the University of Berlin, where he received his Ph.D. in 1885. After one further year with Hofmann he joined the group of Victor Meyer at the University of Göttingen and later at the University of Heidelberg. He stayed at Heidelberg until he became professor at the University of Greifswald in 1900. He was responsible for the construction of a new chemistry department, of which he chaired. He left in 1913 to become chair of the chemistry department of the University of Marburg where he stayed until his retirement in 1928. Karl von Auwers died on May 3, 1939 in Marburg. References [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gotha (town)
Gotha () is the fifth-largest city in Thuringia, Germany, west of Erfurt and east of Eisenach with a population of 44,000. The city is the capital of the district of Gotha and was also a residence of the Ernestine Wettins from 1640 until the end of monarchy in Germany in 1918. The House of Saxe-Coburg and Gotha originating here spawned many European rulers, including the royal houses of the United Kingdom, Belgium, Portugal (until 1910) and Bulgaria (until 1946). In the Middle Ages, Gotha was a rich trading town on the trade route ''Via Regia'' and between 1650 and 1850, Gotha saw a cultural heyday as a centre of sciences and arts, fostered by the dukes of Saxe-Gotha. The first duke, Ernest the Pious, was famous for his wise rule. In the 18th century, the ''Almanach de Gotha'' was first published in the city. The publisher Justus Perthes and the encyclopedist Joseph Meyer made Gotha a leading centre of German publishing around 1800. In the early 19th century, Gotha was a b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jocelyn Field Thorpe
Sir Jocelyn Field Thorpe FRS (1 December 1872 – 10 June 1940) was a British chemist who made major contributions to organic chemistry, including the Thorpe-Ingold effect and three named reactions. Early life and education Thorpe was born in Clapham, London on 1 December 1872, one of nine children and the sixth son, of Mr. and Mrs. W.G. Thorpe of the Middle Temple. He attended Worthing College, and then from 1888 - 1890 studied engineering at King's College, London. He then moved to the Royal College of Science from 1890 - 1892 to study chemistry. He earned his Ph.D. in organic chemistry under Karl von Auwers at Heidelberg University in 1895. In 1895 he joined Owens College, Manchester (this became part of the University of Manchester in 1904), starting as an assistant to W. H. Perkin Jr., becoming a lecturer in 1896 and senior lecturer in 1908. In that year he was elected FRS and was awarded a Sorby Fellowship by the Royal Society to study in Sheffield. Career and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Marburg Faculty
A university () is an institution of higher (or tertiary) education and research which awards academic degrees in several academic disciplines. ''University'' is derived from the Latin phrase ''universitas magistrorum et scholarium'', which roughly means "community of teachers and scholars". Universities typically offer both undergraduate and postgraduate programs. The first universities in Europe were established by Catholic Church monks. The University of Bologna (), Italy, which was founded in 1088, is the first university in the sense of: *being a high degree-awarding institute. *using the word ''universitas'' (which was coined at its foundation). *having independence from the ecclesiastic schools and issuing secular as well as non-secular degrees (with teaching conducted by both clergy and non-clergy): grammar, rhetoric, logic, theology, canon law, notarial law.Hunt Janin: "The university in medieval life, 1179–1499", McFarland, 2008, , p. 55f.de Ridder-Symoens, Hilde' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1939 Deaths
This year also marks the start of the Second World War, the largest and deadliest conflict in human history. Events Below, the events of World War II have the "WWII" prefix. January * January 1 ** Third Reich *** Jews are forbidden to work with Germans. *** The Youth Protection Act was passed on April 30, 1938 and the Working Hours Regulations came into effect. *** The Jews name change decree has gone into effect. ** The rest of the world *** In Spain, it becomes a duty of all young women under 25 to complete compulsory work service for one year. *** First edition of the Vienna New Year's Concert. *** The company of technology and manufacturing scientific instruments Hewlett-Packard, was founded in a garage in Palo Alto, California, by William (Bill) Hewlett and David Packard. This garage is now considered the birthplace of Silicon Valley. *** Sydney, in Australia, records temperature of 45 ˚C, the highest record for the city. *** Philipp Etter took over ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1863 Births
Events January–March * January 1 – Abraham Lincoln signs the Emancipation Proclamation during the third year of the American Civil War, making the abolition of slavery in the Confederate states an official war goal. It proclaims the freedom of 3.1 million of the nation's four million slaves and immediately frees 50,000 of them, with the rest freed as Union armies advance. * January 2 – Lucius Tar Painting Master Company (''Teerfarbenfabrik Meirter Lucius''), predecessor of Hoechst, as a worldwide chemical manufacturing brand, founded in a suburb of Frankfurt am Main, Germany. * January 4 – The New Apostolic Church, a Christian and chiliastic church, is established in Hamburg, Germany. * January 7 – In the Swiss canton of Ticino, the village of Bedretto is partly destroyed and 29 killed, by an avalanche. * January 8 ** The Yorkshire County Cricket Club is founded at the Adelphi Hotel, in Sheffield, England. ** American Civil War &nd ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hans Meerwein
Hans Meerwein (May 20, 1879 in Hamburg, Germany – October 24, 1965 in Marburg, Germany) was a German chemist. Several reactions and reagents bear his name, most notably the Meerwein–Ponndorf–Verley reduction, the Wagner–Meerwein rearrangement, the Meerwein arylation reaction, and Meerwein's salt. Life and work His father was the architect, Wilhelm Emil Meerwein. He originally trained to be a chemistry technician or 'chemotechnician' at the Fresenius University of Applied Sciences (between 1898 and 1900) before studying for a chemistry degree at the University of Bonn. After finishing his PhD with Richard Anschütz he worked at the University of Berlin, before returning to Bonn where he became professor in 1914. From 1922 till 1928 he was professor for organic chemistry at the University of Königsberg. The last change in his academic career was to the University of Marburg. The war devastated the Institute and Meerwein was planning the rebuilding which was finished ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Germany
Germany, officially the Federal Republic of Germany (FRG),, is a country in Central Europe. It is the most populous member state of the European Union. Germany lies between the Baltic and North Sea to the north and the Alps to the south. Its 16 constituent states have a total population of over 84 million in an area of . It borders Denmark to the north, Poland and Czechia to the east, Austria and Switzerland to the south, and France, Luxembourg, Belgium, and the Netherlands to the west. The nation's capital and most populous city is Berlin and its main financial centre is Frankfurt; the largest urban area is the Ruhr. Settlement in what is now Germany began in the Lower Paleolithic, with various tribes inhabiting it from the Neolithic onward, chiefly the Celts. Various Germanic tribes have inhabited the northern parts of modern Germany since classical antiquity. A region named Germania was documented before AD 100. In 962, the Kingdom of Germany formed the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthur Auwers
Georg Friedrich Julius Arthur von Auwers (12 September 1838 – 24 January 1915) was a German astronomer. Auwers was born in Göttingen to Gottfried Daniel Auwers and Emma Christiane Sophie (née Borkenstein). He attended the University of Göttingen and worked at the University of Königsberg. He specialized in astrometry, making very precise measurements of stellar positions and motions. He detected the companion stars of Sirius and Procyon from their effects on the main star's motion, before telescopes were powerful enough to visually observe them. He was from 1866 Secretary to the Berlin Academy, and directed expeditions to measure the transits of Venus, in order to measure the distance from the earth to the Sun more accurately, and therefore be able to calculate the dimensions of the Solar System more accurately and with greater precision. He began a project to unify all available sky charts, an interest that began with his catalog of nebulae which he published in 1862. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dienone–phenol Rearrangement
The dienone–phenol rearrangement is a reaction in organic chemistry first reported in 1921 by Karl von Auwers and Karl Ziegler. A common example of dienone–phenol rearrangement is 4,4-disubstituted converting into a stable 3,4-disubstituted phenol in presence of acid. A similar rearrangement is possible with a 2,2-disubstituted cyclohexadienone to its corresponding disubstituted phenol. Usually this type of rearrangement is spontaneous unless a dichloromethyl group is present at the 4th position or the process is otherwise blocked. Reaction mechanism The reaction mechanism of 4,4-disubstituted cyclohexadienones to 3,4-disubstituted phenol is illustrated here. : The migration tendency for the two different groups (R) present at either 4,4 position or 2,2 position can be determined by comparing the relative stability of the intermediate carbocation formed during rearrangement. In case of acid-promoted conditions, some relative migration tendencies are: COOEt > phenyl (or a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Auwers Synthesis
The Auwers synthesis is a series of organic reactions forming a flavonol from a coumarone. This reaction was first reported by Karl von Auwers in 1908.K. v. Auwers, E. Auffenberg, "Über Cumaranone und Hydrindone", ''Ber. Dtsch. Chem. Ges.'', 52, 92-113 (1919) (). The first step in this procedure is an acid catalyzed aldol condensation between benzaldehyde and a 3-cyclooxapentanone to an o-hydroxychalcone. Bromination of the alkene group gives a dibromo-adduct which rearranges to the flavonol by reaction with potassium hydroxide Potassium hydroxide is an inorganic compound with the formula K OH, and is commonly called caustic potash. Along with sodium hydroxide (NaOH), KOH is a prototypical strong base. It has many industrial and niche applications, most of which expl .... Mechanism A possible mechanism for the rearrangement step is shown below: See also * Algar–Flynn–Oyamada reaction * Allan–Robinson reaction References {{Organic reactions Heterocycle for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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