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Alexander William Williamson
Prof Alexander William Williamson FRS FRSE PCS MRIA (1 May 18246 May 1904) was an English chemist. He is best known today for the Williamson ether synthesis. Life Williamson was born in 1824 in Wandsworth, London, the second of three children of Alexander Williamson (originally from Elgin) a clerk with the East India Company and his wife, Antonia McAndrew, daughter of a prominent London merchant. Despite early physical infirmity, the loss of sight in one eye and a largely useless left arm, Williamson grew up in a caring and stimulating intellectual environment. After an early childhood spent in Brighton and then schools in Kensington, Williams enrolled at the University of Heidelberg in 1841. After working under Leopold Gmelin at Heidelberg, he transferred to the University of Giessen to work with Justus von Liebig, where he received his PhD in 1845. Williamson then spent three years in Paris studying higher mathematics under Auguste Comte. In 1849, with the support of T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wandsworth
Wandsworth Town () is a district of south London, within the London Borough of Wandsworth southwest of Charing Cross. The area is identified in the London Plan The London Plan is the statutory spatial development strategy for the Greater London area in the United Kingdom that is written by the Mayor of London and published by the Greater London Authority. The regional planning document was first pu ... as one of 35 major centres in Greater London. Toponymy Wandsworth takes its name from the River Wandle, which enters the River Thames, Thames at Wandsworth. Wandsworth appears in Domesday Book of 1086 as ''Wandesorde'' and ''Wendelesorde''. This means 'enclosure of (a man named) Waendel', whose name is also lent to the River Wandle. To distinguish it from the London Borough of Wandsworth, and historically from the Wandsworth District (Metropolis), Wandsworth District of the Metropolis and the Metropolitan Borough of Wandsworth, which all covered larger areas, it is al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paris, France
Paris () is the Capital city, capital and List of communes in France with over 20,000 inhabitants, most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the List of cities proper by population density, 30th most densely populated city in the world in 2020. Since the 17th century, Paris has been one of the world's major centres of finance, diplomacy, commerce, Fashion capital, fashion, gastronomy, and science. For its leading role in the arts and sciences, as well as its very early system of street lighting, in the 19th century it became known as "the City of Light". Like London, prior to the Second World War, it was also sometimes called Caput Mundi#Paris, the capital of the world. The City of Paris is the centre of the Île-de-France Regions of France, region, or Paris Region, with an estimated population of 12,262,544 in 2019, or about 19% of the population of France, making the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrochloric Acid
Hydrochloric acid, also known as muriatic acid, is an aqueous solution of hydrogen chloride. It is a colorless solution with a distinctive pungent smell. It is classified as a strong acid Acid strength is the tendency of an acid, symbolised by the chemical formula HA, to dissociate into a proton, H+, and an anion, A-. The dissociation of a strong acid in solution is effectively complete, except in its most concentrated solutions .... It is a component of the gastric acid in the digestive systems of most animal species, including humans. Hydrochloric acid is an important laboratory reagent and industrial chemical. History In the early tenth century, the Persian physician and alchemist Abu Bakr al-Razi ( 865–925, Latin: Rhazes) conducted experiments with sal ammoniac (ammonium chloride) and vitriol (hydrated sulfates of various metals), which he distilled together, thus producing the gas hydrogen chloride. In doing so, al-Razi may have stumbled upon a primitive method ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Molecule
A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds; depending on context, the term may or may not include ions which satisfy this criterion. In quantum physics, organic chemistry, and biochemistry, the distinction from ions is dropped and ''molecule'' is often used when referring to polyatomic ions. A molecule may be homonuclear, that is, it consists of atoms of one chemical element, e.g. two atoms in the oxygen molecule (O2); or it may be heteronuclear, a chemical compound composed of more than one element, e.g. water (two hydrogen atoms and one oxygen atom; H2O). In the kinetic theory of gases, the term ''molecule'' is often used for any gaseous particle regardless of its composition. This relaxes the requirement that a molecule contains two or more atoms, since the noble gases are individual atoms. Atoms and complexes connected by non-covalent interactions, such as hydrogen bonds or ionic bonds, are typically not consid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haloalkane
The haloalkanes (also known as halogenoalkanes or alkyl halides) are alkanes containing one or more halogen substituents. They are a subset of the general class of halocarbons, although the distinction is not often made. Haloalkanes are widely used commercially. They are used as flame retardants, fire extinguishants, refrigerants, propellants, solvents, and pharmaceuticals. Subsequent to the widespread use in commerce, many halocarbons have also been shown to be serious pollutants and toxins. For example, the chlorofluorocarbons have been shown to lead to ozone depletion. Methyl bromide is a controversial fumigant. Only haloalkanes that contain chlorine, bromine, and iodine are a threat to the ozone layer, but fluorinated volatile haloalkanes in theory may have activity as greenhouse gases. Methyl iodide, a naturally occurring substance, however, does not have ozone-depleting properties and the United States Environmental Protection Agency has designated the compound a non-ozone l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alkoxide
In chemistry, an alkoxide is the conjugate base of an alcohol and therefore consists of an organic group bonded to a negatively charged oxygen atom. They are written as , where R is the organic substituent. Alkoxides are strong bases and, when R is not bulky, good nucleophiles and good ligands. Alkoxides, although generally not stable in protic solvents such as water, occur widely as intermediates in various reactions, including the Williamson ether synthesis. Transition metal alkoxides are widely used for coatings and as catalysts. Enolates are unsaturated alkoxides derived by deprotonation of a bond adjacent to a ketone or aldehyde. The nucleophilic center for simple alkoxides is located on the oxygen, whereas the nucleophilic site on enolates is delocalized onto both carbon and oxygen sites. Ynolates are also unsaturated alkoxides derived from acetylenic alcohols. Phenoxides are close relatives of the alkoxides, in which the alkyl group is replaced by a derivative of be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ether
In organic chemistry, ethers are a class of compounds that contain an ether group—an oxygen atom connected to two alkyl or aryl groups. They have the general formula , where R and R′ represent the alkyl or aryl groups. Ethers can again be classified into two varieties: if the alkyl or aryl groups are the same on both sides of the oxygen atom, then it is a simple or symmetrical ether, whereas if they are different, the ethers are called mixed or unsymmetrical ethers. A typical example of the first group is the solvent and anaesthetic diethyl ether, commonly referred to simply as "ether" (). Ethers are common in organic chemistry and even more prevalent in biochemistry, as they are common linkages in carbohydrates and lignin. Structure and bonding Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. The bonding of oxygen in ethers, alcohols, and water is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Williamson Alexander W
Williamson may refer to: Places *Williamson, Arizona *Williamson, Georgia *Williamson, Illinois *Williamson, Iowa *Williamson, New York, a town in Wayne County, New York. *Williamson (CDP), New York, a hamlet and census-designated place in Wayne County, New York. *Williamson, West Virginia *Williamson County, Illinois *Williamson County, Tennessee *Williamson County, Texas People *Williamson (surname) Other uses *''Williamson v. Lee Optical Co.'', a 1955 U.S. Supreme Court case *Williamson amplifier, a type of push-pull audio amplifier with low distortion first designed in 1947 *Williamson Road Junior Public School, an elementary school in Toronto, Ontario *Williamson ether synthesis, one of the most common methods for preparing ethers See also *Williams (other) *Williamston (other) *Williamstown (other) *Justice Williamson (other) *Wilson (other) Wilson may refer to: People *Wilson (name) ** List of people with given name Wilson ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annals Of Science
''Annals of Science'' is a peer-reviewed academic journal covering the history of science and technology. It is published by Taylor & Francis and was established in 1936. The founding editor-in-chief was the Canadian historian of science Harcourt Brown.R.E.W. MaddisonIndex to Volumes 1 to 25 (1936-1969). ''Annals of Science''. History The journal was established after Brown visited Britain for a year and discussed where he could publish work on the history of science with Henry Robinson of the library of the Royal Society of London. They decided that aside from the Belgian ''Isis'', there were few outlets for such work, and so founded the ''Annals of Science'' with Douglas McKie (University College London), who was the main editor. The aim was to publish faster than ''Isis'' and with a focus on the modern period. The editors chose to have a bright orange cover to make it stand out against the usual blue or grey of periodicals at the time. Around the time of World War II, only th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surrey
Surrey () is a ceremonial and non-metropolitan county in South East England, bordering Greater London to the south west. Surrey has a large rural area, and several significant urban areas which form part of the Greater London Built-up Area. With a population of approximately 1.2 million people, Surrey is the 12th-most populous county in England. The most populated town in Surrey is Woking, followed by Guildford. The county is divided into eleven districts with borough status. Between 1893 and 2020, Surrey County Council was headquartered at County Hall, Kingston-upon-Thames (now part of Greater London) but is now based at Woodhatch Place, Reigate. In the 20th century several alterations were made to Surrey's borders, with territory ceded to Greater London upon its creation and some gained from the abolition of Middlesex. Surrey is bordered by Greater London to the north east, Kent to the east, Berkshire to the north west, West Sussex to the south, East Sussex to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haslemere
The town of Haslemere () and the villages of Shottermill and Grayswood are in south west Surrey, England, around south west of London. Together with the settlements of Hindhead and Beacon Hill, they comprise the civil parish of Haslemere in the Borough of Waverley. The tripoint between the counties of Surrey, Hampshire and West Sussex is at the west end of Shottermill. Much of the civil parish is in the catchment area of the south branch of the River Wey, which rises on Blackdown in West Sussex. The urban areas of Haslemere and Shottermill are concentrated along the valleys of the young river and its tributaries, and many of the local roads are narrow and steep. The National Trust is a major landowner in the civil parish and its properties include Swan Barn Farm. The Surrey Hills Area of Outstanding Natural Beauty is to the north of the town and the South Downs National Park is to the south. Haslemere is thought to have originated as a planned town in the 12th century a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Hewitt Key
Thomas Hewitt Key, FRS (20 March 179929 November 1875) was an English classical scholar. Life He was born in London and educated at St John's and Trinity Colleges, Cambridge, and graduated 19th wrangler in 1821. From 1825 to 1827 he was the founding professor of Pure mathematics in the University of Virginia; Key owned at least one slave during his time there. After his return to England was appointed in 1828 professor of Latin in the newly founded University of London. In 1832 he became joint headmaster of the school founded in connection with that institution (the University College School); in 1842 he resigned the professorship of Latin, and took up that of comparative grammar, together with the undivided headmastership of the school. These two posts he held until his death. A few years before his death, he also took the position of secretary to the College of Preceptors in London (later known as the College of Teachers). Key is best known for his introduction of the cr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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