|
Alan R. Katritzky
Alan Roy Katritzky Fellow of the Royal Society, FRS (18 August 1928 – 10 February 2014) was a British-born American chemist, latterly working at the University of Florida. He was a Heterocyclic compound, heterocyclic chemistry pioneer, who played a leading role in the subject’s elucidation and development. Early life and education Alan Roy Katritzky was born in Harringay on 18 August 1928, son of Frederick Charles Katritzky, a tailor, and Emily Catherine (née Lane). In 1940 he was evacuated with other children from his secondary school (Hornsey County Grammar School) to Wisbech in Cambridgeshire, and it was there that "his passion for chemistry was inspired by the chemistry master, W. E. Fieldhouse". Having returned to Harringay, he set up his own laboratory at home and on his fifteenth birthday he prepared his first heterocyclic compound, the barbiturate drug Veronal. After 18 months of Conscription in the United Kingdom#After 1945, National Service, he entered St Cather ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harringay
Harringay (pronounced ) is a district of north London, England, within the London Borough of Haringey. It is centred on the section of Green Lanes running between the New River, where it crosses Green Lanes by Finsbury Park, and Duckett's Common, near Turnpike Lane. Location The boundaries of Harringay form a rough boot shape in the extreme southern centre of the borough of Haringey. The western boundary of Harringay is formed by the East Coast Main Line. The northern boundary is to the south of Turnpike Lane, running parallel to it, somewhere between Sydney Road and Fairfax Road. In the northeast, the boundary roughly corresponds with a line drawn between the south of Duckett's Common and the north end of Warwick Gardens. A line due south of this point, as far as Eade Road, forms the eastern boundary. Southeast of here a line to Finsbury Park completes the southeastern limits. Finsbury Park is officially part of HarringayWard boundaries classify the park as being within ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strychnine
Strychnine (, , US chiefly ) is a highly toxic, colorless, bitter, crystalline alkaloid used as a pesticide, particularly for killing small vertebrates such as birds and rodents. Strychnine, when inhaled, swallowed, or absorbed through the eyes or mouth, causes poisoning which results in muscular convulsions and eventually death through asphyxia. While it is no longer used medicinally, it was used historically in small doses to strengthen muscle contractions, such as a heart and bowel stimulant and performance-enhancing drug. The most common source is from the seeds of the ''Strychnos nux-vomica'' tree. Biosynthesis Strychnine is a terpene indole alkaloid belonging to the ''Strychnos'' family of '' Corynanthe'' alkaloids, and it is derived from tryptamine and secologanin. The biosynthesis of strychine was solved in 2022. The enzyme, strictosidine synthase, catalyzes the condensation of tryptamine and secologanin, followed by a Pictet-Spengler reaction to form strictosidine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ferrania
FILM Ferrania s.r.l. is a photographic film manufacturing company located in Ferrania (Liguria), Italy. Ferrania was founded in 1923 as a maker of photographic film, papers, and photographic equipment, including cameras. The company was purchased in 1964 by the 3M company to become Ferrania 3M, until it was spun off in 1996 to 3M's Imation division. In 1999, Ferrania was acquired by Schroder Ventures and then spun off as a separate company. Subsequently, it was acquired by a Genoese shipping company, Gruppo Messina (Ignazio Messina & Co. S.p.A.) who ceased photographic activities in 2009. The company was re-founded in 2013 as FILM Ferrania to build a new film manufacturing base using a small portion of the historic campus. History Original Ferrania The roots to the Ferrania company lie with the 1882-founded explosives manufacturer SIPE (Società Italiana Prodotti Esplodenti, "Italian Society of Explosive Products"). World War I saw a wide extension of business for SIPE, i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harlow
Harlow is a large town and local government district located in the west of Essex, England. Founded as a new town, it is situated on the border with Hertfordshire and London, Harlow occupies a large area of land on the south bank of the upper Stort Valley, which has been made navigable through other towns and features a canal section near its watermill. Old Harlow is a historic village founded by the early medieval age and most of its high street buildings are early Victorian and residential, mostly protected by one of the Conservation Areas in the district. In Old Harlow is a field named Harlowbury, a de-settled monastic area which has the remains of a chapel, a scheduled ancient monument. The M11 motorway passes through to the east of the town. Harlow has its own commercial and leisure economy. It is also an outer part of the London commuter belt and employment centre of the M11 corridor which includes Cambridge and London Stansted Airport to the north. At the time of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saint Paul, Minnesota
Saint Paul (abbreviated St. Paul) is the List of capitals in the United States, capital of the U.S. state of Minnesota and the county seat of Ramsey County, Minnesota, Ramsey County. Situated on high bluffs overlooking a bend in the Mississippi River, Saint Paul is a regional business hub and the center of Minnesota's government. The Minnesota State Capitol and the state government offices all sit on a hill close to the city's downtown district. One of the oldest cities in Minnesota, Saint Paul has several historic neighborhoods and landmarks, such as the Summit Avenue (St. Paul), Summit Avenue Neighborhood, the James J. Hill House, and the Cathedral of Saint Paul (Minnesota), Cathedral of Saint Paul. Like the adjacent and larger city of Minneapolis, Saint Paul is known for its cold, snowy winters and humid summers. As of the 2021 census estimates, the city's population was 307,193, making it the List of United States cities by population, 67th-largest city in the United State ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Council
The British Council is a British organisation specialising in international cultural and educational opportunities. It works in over 100 countries: promoting a wider knowledge of the United Kingdom and the English language (and the Welsh language in Argentina); encouraging cultural, scientific, technological and educational co-operation with the United Kingdom. The organisation has been called a soft power extension of UK foreign policy, as well as a tool for propaganda. The British Council is governed by a Royal Charter. It is also a public corporation and an executive nondepartmental public body (NDPB), sponsored by the Foreign, Commonwealth and Development Office. Its headquarters are in Stratford, London. Its Chairman is Stevie Spring and its Chief Executive is Scott McDonald. History *1934: British Foreign Office officials created the "British Committee for Relations with Other Countries" to support English education abroad, promote British culture and fight the rise o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Rees
Charles Wayne Rees CBE FRS FRSC (15 October 1927 – 21 September 2006) was a British organic chemist. Early life and education Rees was born in Egypt, and educated in England at . After three years as a laboratory technician at the he went to University College at |
Electrophilic Aromatic Substitution
Electrophilic aromatic substitution is an organic reaction in which an atom that is attached to an aromatic system (usually hydrogen) is replaced by an electrophile. Some of the most important electrophilic aromatic substitutions are aromatic nitration, aromatic halogenation, aromatic sulfonation, and alkylation and acylation Friedel–Crafts reaction. Illustrative reactions The most widely practised example of this reaction is the ethylation of benzene. :: Approximately 24,700,000 tons were produced in 1999. (After dehydrogenation and polymerization, the commodity plastic polystyrene is produced.) In this process, acids are used as catalyst to generate the incipient carbocation. Many other electrophilic reactions of benzene are conducted, although on a much smaller scale; they are valuable routes to key intermediates. The nitration of benzene is achieved via the action of the nitronium ion as the electrophile. The sulfonation with fuming sulfuric acid gives benzenesulfonic ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aromaticity
In chemistry, aromaticity is a chemical property of cyclic ( ring-shaped), ''typically'' planar (flat) molecular structures with pi bonds in resonance (those containing delocalized electrons) that gives increased stability compared to saturated compounds having single bonds, and other geometric or connective non-cyclic arrangements with the same set of atoms. Aromatic rings are very stable and do not break apart easily. Organic compounds that are not aromatic are classified as aliphatic compounds—they might be cyclic, but only aromatic rings have enhanced stability. The term ''aromaticity'' with this meaning is historically related to the concept of having an aroma, but is a distinct property from that meaning. Since the most common aromatic compounds are derivatives of benzene (an aromatic hydrocarbon common in petroleum and its distillates), the word ''aromatic'' occasionally refers informally to benzene derivatives, and so it was first defined. Nevertheless, many non-be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Cockcroft
Sir John Douglas Cockcroft, (27 May 1897 – 18 September 1967) was a British physicist who shared with Ernest Walton the Nobel Prize in Physics in 1951 for splitting the atomic nucleus, and was instrumental in the development of nuclear power. After service on the Western Front with the Royal Field Artillery during the Great War, Cockcroft studied electrical engineering at Manchester Municipal College of Technology whilst he was an apprentice at Metropolitan Vickers Trafford Park and was also a member of their research staff. He then won a scholarship to St. John's College, Cambridge, where he sat the tripos exam in June 1924, becoming a wrangler. Ernest Rutherford accepted Cockcroft as a research student at the Cavendish Laboratory, and Cockcroft completed his doctorate under Rutherford's supervision in 1928. With Ernest Walton and Mark Oliphant he built what became known as a Cockcroft–Walton generator. Cockcroft and Walton used this to perform the first artifi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexander R
Alexander is a male given name. The most prominent bearer of the name is Alexander the Great, the king of the Ancient Greek kingdom of Macedonia who created one of the largest empires in ancient history. Variants listed here are Aleksandar, Aleksander and Aleksandr. Related names and diminutives include Iskandar, Alec, Alek, Alex, Alexandre, Aleks, Aleksa and Sander; feminine forms include Alexandra, Alexandria, and Sasha. Etymology The name ''Alexander'' originates from the (; 'defending men' or 'protector of men'). It is a compound of the verb (; 'to ward off, avert, defend') and the noun (, genitive: , ; meaning 'man'). It is an example of the widespread motif of Greek names expressing "battle-prowess", in this case the ability to withstand or push back an enemy battle line. The earliest attested form of the name, is the Mycenaean Greek feminine anthroponym , , (/Alexandra/), written in the Linear B syllabic script. Alaksandu, alternatively called ''Alakasandu'' or ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.svg "Click for more on -> Saint Paul, Minnesota")
.png "Click for more on -> Aromaticity")
