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Conrad Willgerodt
Conrad Heinrich Christoph Willgerodt (November 2, 1841 – December 19, 1930) was a German chemist who first described the Willgerodt reaction. Alongside the Willgerodt reaction, he had also discovered Iodosobenzene and chlorobutanol. As for his career, Conrad Willgerodt was a professor at the University of Freiburg The University of Freiburg (colloquially german: Uni Freiburg), officially the Albert Ludwig University of Freiburg (german: Albert-Ludwigs-Universität Freiburg), is a public university, public research university located in Freiburg im Breisg .... References External links * 1841 births 1930 deaths 19th-century German chemists University of Freiburg faculty People from Goslar (district) People from the Duchy of Brunswick 20th-century German chemists {{Germany-chemist-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harlingerode
Harlingerode () is a village in Germany and district of Bad Harzburg in the district of Goslar in Lower Saxony. As of 2020, Harlingerode had a population of 2,916. Geography Harlingerode lies between 190 and , increasing in height in southern direction. The Langenberg in the south is the most dominant landmark with its height of up to 304 m. The town is impenetrated by the Hurle, a tributary of the Oker. History Etymology The stem ''Harl-'' is derived from a settlor ''Herilo'', which is ultimately rooted in a Proto-Germanic stem *harjaz meaning "army", still visible in German "Heer" and obsolete English "here". -ingerode is a locally widespread ending around the northern Harz region that served as a generic suffix for town names derived by any personal names (compare Göttingerode, Bettingerode). Timeline Harlingerode was founded between the 9th and 10th century by the Saxon House of Billung. Harlingerode was first mentioned as ''Gut Heregeltingerode'' (Estate of Her ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Duchy Of Brunswick
The Duchy of Brunswick (german: Herzogtum Braunschweig) was a historical German state. Its capital city, capital was the city of Braunschweig, Brunswick (). It was established as the successor state of the Principality of Brunswick-Wolfenbüttel by the Congress of Vienna in 1815. In the course of the 19th-century history of Germany, the duchy was part of the German Confederation, the North German Confederation and from 1871 the German Empire. It was disestablished after the end of World War I, its territory incorporated into the Weimar Republic as the Free State of Brunswick. History Principality of Brunswick-Wolfenbüttel The title "Brunswick-Lüneburg, Duke of Brunswick and Lüneburg" (german: Herzog zu Braunschweig und Lüneburg) was held, from 1235 on, by various members of the House of Welf, Welf (Guelph) family who ruled several small territories in northwest Germany. These holdings did not have all of the formal characteristics of a modern unitary state, being neither ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bad Harzburg
Bad Harzburg (; Eastphalian: ''Bad Harzborch'') is a spa town in central Germany, in the Goslar district of Lower Saxony. It lies on the northern edge of the Harz mountains and is a recognised saltwater spa and climatic health resort. Geography Bad Harzburg is situated at the northern foot of the Harz mountain range on the edge of the Harz National Park. To the east of the borough is the boundary between the states of Lower Saxony and Saxony-Anhalt, the former Inner German Border. The small ''Radau'' river, a tributary to the Oker, has its source in the Harz mountains and flows through the town. Nearby are the towns of Goslar to the west, Vienenburg to the north, Braunlage to the south and Ilsenburg and Osterwieck in the east. Bad Harzburg is rich in natural resources such as gabbro, chalk, gravel, and oolithic iron ore (former Hansa Pit), all of which are or were mined in today's city's area. Climatically Bad Harzburg is a transition zone to a pure alpine region with a pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Germany
Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated between the Baltic and North seas to the north, and the Alps to the south; it covers an area of , with a population of almost 84 million within its 16 constituent states. Germany borders Denmark to the north, Poland and the Czech Republic 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 financial centre is Frankfurt; the largest urban area is the Ruhr. 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 bulk of the Holy Roman Empire. During the 16th ce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Freiburg
The University of Freiburg (colloquially german: Uni Freiburg), officially the Albert Ludwig University of Freiburg (german: Albert-Ludwigs-Universität Freiburg), is a public university, public research university located in Freiburg im Breisgau, Baden-Württemberg, Germany. The university was founded in 1457 by the House of Habsburg, Habsburg dynasty as the second university in Austrians, Austrian-Habsburg territory after the University of Vienna. Today, Freiburg is the List of universities in Germany#Universities by date of establishment, fifth-oldest university in Germany, with a long tradition of teaching the humanities, social sciences and natural sciences and technology and enjoys a high academic reputation both nationally and internationally. The university is made up of 11 faculty (division), faculties and attracts students from across Germany as well as from over 120 other countries. Foreign students constitute about 18.2% of total student numbers. The University of Fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adolf Karl Ludwig Claus
Adolf Karl Ludwig Claus (6 June 1838 – 4 May 1900) was a German chemist. He is known for his structure of benzene proposed in 1867. Life Claus was born in 1838 in Kassel, Germany. Starting from 1850, he studied medicine in Marburg and later chemistry at the University of Marburg, with Hermann Kolbe. After spending a short time at the University of Berlin, he worked with Friedrich Wöhler at the University of Göttingen. He received his PhD in 1862, and in the same year changed his position and started working at the University of Freiburg. He completed his habilitation in 1866 and became assistant professor in the following year. With the retirement of Lambert Heinrich von Babo, Claus succeeded him as full professor. He held that position until his retirement due to health problems in 1900. Clause died in Horheim near Wutöschingen in the same year. Work Claus mostly worked in organic chemistry where his interests were very diverse and included alkaloids, aromatic substituti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Willgerodt Reaction
The Willgerodt rearrangement or Willgerodt reaction is an organic reaction converting an aryl alkyl ketone, alkyne, or alkene to the corresponding amide by reaction with ammonium polysulfide, named after Conrad Willgerodt. The formation of the corresponding carboxylic acid is a side reaction. When the alkyl group is an aliphatic chain (n typically 0 to 5), multiple reactions take place with the amide group always ending up at the terminal end. An example with modified reagents (sulfur, concentrated ammonium hydroxide and pyridine) is the conversion of acetophenone to 2-phenylacetamide and phenylacetic acid Willgerodt–Kindler reaction The related Willgerodt–Kindler reaction takes place with elemental sulfur and an amine like morpholine. The initial product is a thioacetamide for example that of acetophenone which can again be hydrolyzed to the amide. The reaction is named after Karl Kindler. Reaction mechanism A possible reaction mechanism for the Kindler variation' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Willgerodt Rearrangement
The Willgerodt rearrangement or Willgerodt reaction is an organic reaction converting an aryl alkyl ketone, alkyne, or alkene to the corresponding amide by reaction with ammonium polysulfide, named after Conrad Willgerodt. The formation of the corresponding carboxylic acid is a side reaction. When the alkyl group is an aliphatic chain (n typically 0 to 5), multiple reactions take place with the amide group always ending up at the terminal end. An example with modified reagents (sulfur, concentrated ammonium hydroxide and pyridine) is the conversion of acetophenone to 2-phenylacetamide and phenylacetic acid Willgerodt–Kindler reaction The related Willgerodt–Kindler reaction takes place with elemental sulfur and an amine like morpholine. The initial product is a thioacetamide for example that of acetophenone which can again be hydrolyzed to the amide. The reaction is named after Karl Kindler. Reaction mechanism A possible reaction mechanism for the Kindler variation'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iodosobenzene
Iodosobenzene or iodosylbenzene is an organoiodine compound with the empirical formula . This colourless solid compound is used as an oxo transfer reagent in research laboratories examining organic and coordination chemistry. Preparation and structure Iodosobenzene is prepared from iodobenzene. It is prepared by first oxidizing iodobenzene by peracetic acid. Hydrolysis of resulting diacetate affords "PhIO": : : The structure of iodosobenzene has been verified by crystallographically. Related derivatives are also oligomeric. Its low solubility in most solvents and vibrational spectroscopy indicate that it is not molecular, but is polymeric, consisting of –I–O–I–O– chains. The related diacetate, , illustrates the ability of iodine(III) to adopt a T-shaped geometry without multiple bonds. Theoretical studies show that the bonding between the iodine and oxygen atoms in iodosobenzene represents a single dative I-O sigma bond, confirming the absence of the double I=O bond. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlorobutanol
Chlorobutanol (trichloro-2-methyl-2-propanol) is a preservative, sedative, hypnotic and weak local anesthetic similar in nature to chloral hydrate. It has antibacterial and antifungal properties. Chlorobutanol is typically used at a concentration of 0.5% where it lends long term stability to multi-ingredient formulations. However, it retains antimicrobial activity at 0.05% in water. Chlorobutanol has been used in anesthesia and euthanasia of invertebrates and fishes. It is a white, volatile solid with a camphor-like odor. Synthesis Chlorobutanol was first synthesized in 1881 by the German chemist Conrad Willgerodt (1841–1930). Chlorobutanol is formed by the reaction of chloroform and acetone in the presence of potassium or sodium hydroxide. It may be purified by sublimation or recrystallisation. Toxicity Chlorobutanol is highly toxic to the liver, is a skin irritant and a severe eye irritant. Parthenogenesis Chlorobutanol has proven effective at stimulating parthenoge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1841 Births
Events January–March * January 20 – Charles Elliot of the United Kingdom, and Qishan of the Qing dynasty, agree to the Convention of Chuenpi. * January 26 – Britain occupies Hong Kong. Later in the year, the first census of the island records a population of about 7,500. * January 27 – The active volcano Mount Erebus in Antarctica is discovered, and named by James Clark Ross. * January 28 – Ross discovers the "Victoria Barrier", later known as the Ross Ice Shelf. On the same voyage, he discovers the Ross Sea, Victoria Land and Mount Terror. * January 30 – A fire ruins and destroys two-thirds of the villa (modern-day city) of Mayagüez, Puerto Rico. * February 4 – First known reference to Groundhog Day in North America, in the diary of a James Morris. * February 10 – The Act of Union (''British North America Act'', 1840) is proclaimed in Canada. * February 11 – The two colonies of the Canadas are merged, into the United Province of Canada. * February ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1930 Deaths
Year 193 ( CXCIII) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Sosius and Ericius (or, less frequently, year 946 ''Ab urbe condita''). The denomination 193 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire * January 1 – Year of the Five Emperors: The Roman Senate chooses Publius Helvius Pertinax, against his will, to succeed the late Commodus as Emperor. Pertinax is forced to reorganize the handling of finances, which were wrecked under Commodus, to reestablish discipline in the Roman army, and to suspend the food programs established by Trajan, provoking the ire of the Praetorian Guard. * March 28 – Pertinax is assassinated by members of the Praetorian Guard, who storm the imperial palace. The Empire is auctioned of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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