|
Hugo Erdmann
Hugo Wilhelm Traugott Erdmann (8 May 1862 – 25 June 1910) was the German chemist who discovered, together with his doctoral advisor Jacob Volhard, the Volhard-Erdmann cyclization. In 1898 he was the first who coined the term ''noble gas'' (the original noun is in German). Erdmann invented the name Thiozone in 1908, hypothesizing that S3 made up a large proportion of liquid sulfur. In collaboration with Rudolph Fittig, Erdmann found that dehydration of γ-phenyl structural analog of isocrotonic acid produced α-naphthol, an observation that provided evidence in understanding the nature of naphthalene. Bibliography Books written by Erdmann: # See also * German inventors and discoverers This is a list of German inventors and discoverers. The following list comprises people from Germany or German-speaking Europe, and also people of predominantly German heritage, in alphabetical order of the surname. A *Ernst Abbe: Invented th ... References * * Notes 1862 bir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Preußisch Holland
Preußisch is the German language adjective for "Prussian". Preußisch may refer to: ;Places in Germany * Preußisch Oldendorf, town in North Rhine-Westphalia ;Places outside of Germany *Preußisch Eylau, now Bagrationovsk, Russia *Preußisch Friedland, now Debrzno, Poland *Preußisch Holland, now Pasłęk, Poland *Preußisch Stargard, now Starogard Gdański Starogard Gdański (; until 1950: ''Starogard''; formerly ) is a city in Pomeranian Voivodeship in northern Poland with 48,328 inhabitants (2004). Starogard is the capital of Starogard County. Founded in the Middle Ages, Starogard is a city with ..., Poland ;Other things * ''Neue Preußische Zeitung'', German newspaper * Preußisches Herrenhaus, Prussian House of Lords * Preußische Treuhand, German expellee company {{Disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isocrotonic Acid
Isocrotonic acid (also known as quartenylic acid; formally named (''Z'')-2-butenoic acid) is the ''cis'' isomer of crotonic acid. It is an oil, possessing an odor similar to that of brown sugar. At its boiling point of 171.9 °C, it converts into crotonic acid. The compound can be prepared from 1,3dibromo- 2butanone via the Favorskii rearrangement. Related compounds Ethyl isocrotonate can be prepared by semihydrogenation of ethyl tetrolate. Rudolph Fittig and Hugo Erdmann showed that the γ-phenyl structural analog of isocrotonic acid forms α-naphthol when dehydrated, an observation that provided useful evidence in understanding the nature of naphthalene Naphthalene is an organic compound with formula . It is the simplest polycyclic aromatic hydrocarbon, and is a white Crystal, crystalline solid with a characteristic odor that is detectable at concentrations as low as 0.08 Parts-per notation ....{{cite journal, first1 = Rudolph, last1 = Fittig, first2 = Hug ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
19th-century German Chemists
The 19th century began on 1 January 1801 (represented by the Roman numerals MDCCCI), and ended on 31 December 1900 (MCM). It was the 9th century of the 2nd millennium. It was characterized by vast social upheaval. Slavery was Abolitionism, abolished in much of Europe and the Americas. The First Industrial Revolution, though it began in the late 18th century, expanded beyond its British homeland for the first time during the 19th century, particularly remaking the economies and societies of the Low Countries, France, the Rhineland, Northern Italy, and the Northeastern United States. A few decades later, the Second Industrial Revolution led to ever more massive urbanization and much higher levels of productivity, profit, and prosperity, a pattern that continued into the 20th century. The Catholic Church, in response to the growing influence and power of modernism, secularism and materialism, formed the First Vatican Council in the late 19th century to deal with such problems an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scientists From The Province Of Prussia
A scientist is a person who researches to advance knowledge in an area of the natural sciences. In classical antiquity, there was no real ancient analog of a modern scientist. Instead, philosophers engaged in the philosophical study of nature called natural philosophy, a precursor of natural science. Though Thales ( 624–545 BC) was arguably the first scientist for describing how cosmic events may be seen as natural, not necessarily caused by gods,Frank N. Magill''The Ancient World: Dictionary of World Biography'', Volume 1 Routledge, 2003 it was not until the 19th century that the term ''scientist'' came into regular use after it was coined by the theologian, philosopher, and historian of science William Whewell in 1833. History The roles of "scientists", and their predecessors before the emergence of modern scientific disciplines, have evolved considerably over time. Scientists of different eras (and before them, natural philosophers, mathematicians, natur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
People From Pasłęk
The term "the people" refers to the public or common mass of people of a polity. As such it is a concept of human rights law, international law as well as constitutional law, particularly used for claims of popular sovereignty. In contrast, a people is any plurality of persons considered as a whole. Used in politics and law, the term "a people" refers to the collective or community of an ethnic group or nation. Concepts Legal Chapter One, Article One of the Charter of the United Nations states that "peoples" have the right to self-determination. Though the mere status as peoples and the right to self-determination, as for example in the case of Indigenous peoples (''peoples'', as in all groups of indigenous people, not merely all indigenous persons as in ''indigenous people''), does not automatically provide for independent sovereignty and therefore secession. Indeed, judge Ivor Jennings identified the inherent problems in the right of "peoples" to self-determination, as i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1910 Deaths
Events January * January 6 – Abé people in the French West Africa colony of Côte d'Ivoire rise against the colonial administration; the rebellion is brutally suppressed by the military. * January 8 – By the Treaty of Punakha, the Himalayan kingdom of Bhutan becomes a protectorate of the British Empire. * January 11 – Charcot Island is discovered by the Antarctic expedition led by French explorer Jean-Baptiste Charcot on the ship '' Pourquoi Pas?'' Charcot returns from his expedition on February 11. * January 12 – Great January Comet of 1910 first observed ( perihelion: January 17). * January 15 – Amidst the constitutional crisis caused by the House of Lords rejecting the People's Budget the January 1910 United Kingdom general election is held resulting in a hung parliament with neither Liberals nor Conservatives gaining a majority. * January 21 – The Great Flood of Paris begins when the Seine overflows its banks. * January 22 – Completion of cons ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1862 Births
Events January * January 1 – The United Kingdom annexes Lagos Island, in modern-day Nigeria. * January 6 – Second French intervention in Mexico, French intervention in Mexico: Second French Empire, French, Spanish and British forces arrive in Veracruz, Mexico. * January 16 – Hartley Colliery disaster in north-east England: 204 men are trapped and die underground when the only shaft becomes blocked. * January 30 – American Civil War: The first U.S. ironclad warship, , is launched in Brooklyn. * January 31 – Alvan Graham Clark makes the first observation of Sirius B, a white dwarf star, through an eighteen-inch telescope at Northwestern University in Illinois. February * February 1 – American Civil War: Julia Ward Howe's "Battle Hymn of the Republic" is published for the first time in the ''Atlantic Monthly''. * February 2 – The Dun Mountain Railway, first railway is opened in New Zealand, by the Dun Mountain Copper Mining Compan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Inventors And Discoverers
This is a list of German inventors and discoverers. The following list comprises people from Germany or German-speaking Europe, and also people of predominantly German heritage, in alphabetical order of the surname. A *Ernst Abbe: Invented the first refractometer, and many other devices. Donated his shares in the company Carl Zeiss to form Carl-Zeiss-Stiftung, still in existence today. * Franz Carl Achard: Developed a process to produce sugar from sugar beet. Built the first factory for the process in 1802. * Robert Adler: Invented a better television remote control. *Konrad Adenauer: Invented soya sausage (1916; "Kölner Wurst") and, together with Jean and Josef Oebel, oarsewholemeal bread (1917; Kölner Brot). *Georgius Agricola: Named "the father of mineralogy". * Wilhelm Albert: Invented the wire rope 1834. *Kurt Alder: Discovery of the Diels–Alder reaction, Nobel Prize in Chemistry 1950. * Richard Altmann: Discovery of the Mitochondrion *Alois Alzheimer: Psychiatrist wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Naphthalene
Naphthalene is an organic compound with formula . It is the simplest polycyclic aromatic hydrocarbon, and is a white Crystal, crystalline solid with a characteristic odor that is detectable at concentrations as low as 0.08 Parts-per notation, ppm by mass. As an Aromaticity, aromatic hydrocarbon, naphthalene's structure consists of a fused pair of benzene rings. It is the main ingredient of traditional mothballs. History In the early 1820s, two separate reports described a white solid with a pungent odor derived from the distillation of coal tar. In 1821, John Kidd (chemist), John Kidd cited these two disclosures and then described many of this substance's properties and the means of its production. He proposed the name ''naphthaline'', as it had been derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar). Naphthalene's chemical formula was determined by Michael Faraday in 1826. The structure of two f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
α-naphthol
1-Naphthol, or α-naphthol, is an organic compound with the formula . It is a fluorescence, fluorescent white solid. 1-Naphthol differs from its isomer 2-Naphthol, 2-naphthol by the location of the hydroxide, hydroxyl group on the naphthalene ring. The naphthols are naphthalene homologues of phenol. Both isomers are soluble in simple organic solvents. They are precursors to a variety of useful compounds. Production 1-Naphthol is prepared by two main routes. In one method, naphthalene is nitrated to give 1-nitronaphthalene, which is hydrogenated to the amine followed by hydrolysis: : : : Alternatively, naphthalene is hydrogenated to tetralin, which is oxidized to 1-tetralone, which undergoes dehydrogenation. Reactions Some reactions of 1-naphthol are explicable with reference to its tautomerism, which produces a small amount of the keto tautomer. : One consequence of this tautomerism is the Bucherer reaction, the ammonolysis of 1-naphthol to give 1-Aminonaphthylaminel, 1-ami ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Structural Analog
A structural analog, also known as a chemical analog or simply an analog, is a chemical compound, compound having a chemical structure, structure similar to that of another compound, but differing from it in respect to a certain component. It can differ in one or more atoms, functional groups, or substructures, which are replaced with other atoms, groups, or substructures. A structural analog can be imagined to be formed, at least theoretically, from the other compound. Structural analogs are often isoelectronicity, isoelectronic. Despite a high chemical similarity, structural analogs are not necessarily functional analog (chemistry), functional analogs and can have very different physical, chemical, biochemical, or pharmacological properties. In drug discovery, either a large series of structural analogs of an initial lead compound are created and tested as part of a structure–activity relationship study or a database is virtual screening, screened for structural analogs of a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kingdom Of Prussia
The Kingdom of Prussia (, ) was a German state that existed from 1701 to 1918.Marriott, J. A. R., and Charles Grant Robertson. ''The Evolution of Prussia, the Making of an Empire''. Rev. ed. Oxford: Clarendon Press, 1946. It played a significant role in the unification of Germany in 1871 and was a major constituent of the German Empire until its German Revolution of 1918–1919, dissolution in 1918. Although it took its name from the Prussia (region), region called Prussia, it was based in the Margraviate of Brandenburg. Its capital was Berlin. The list of monarchs of Prussia, kings of Prussia were from the House of Hohenzollern. The polity of Brandenburg-Prussia, predecessor of the kingdom, became a military power under Frederick William, Elector of Brandenburg, known as "The Great Elector". As a kingdom, Prussia continued its rise to power, especially during the reign of Frederick the Great, Frederick II "the Great".Horn, D. B. "The Youth of Frederick the Great 1712–30." ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
