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Spiropentane
Spiropentane is a hydrocarbon with formula . It is the simplest Spiro compound, spiro-connected cycloalkane, a triangulane. It took several years after the discovery in 1887 until the structure of the molecule was determined. According to the nomenclature rules for spiro compounds, the systematic name is spiro[2.2]pentane. However, there can be no isomer, constitutive isomeric spiropentanes, hence the name is unique without brackets and numbers. Synthesis After Gustavson produced cyclopropane by reacting with ground-up zinc metal, he tried the same reaction with (see formula scheme). The starting material is easily obtained by reacting pentaerythritol with hydrobromic acid. A molecule with the formula was obtained. It was called in the initial publication. In 1907, Fecht expressed the assumption that it must be spiropentane, a constitutional isomer of vinylcyclopropane. Further evidence for the structure of the hydrocarbon comes from the fact that it could also be obtained f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spiropentane Topomer
Spiropentane is a hydrocarbon with formula . It is the simplest Spiro compound, spiro-connected cycloalkane, a triangulane. It took several years after the discovery in 1887 until the structure of the molecule was determined. According to the nomenclature rules for spiro compounds, the systematic name is spiro[2.2]pentane. However, there can be no isomer, constitutive isomeric spiropentanes, hence the name is unique without brackets and numbers. Synthesis After Gustavson produced cyclopropane by reacting with ground-up zinc metal, he tried the same reaction with (see formula scheme). The starting material is easily obtained by reacting pentaerythritol with hydrobromic acid. A molecule with the formula was obtained. It was called in the initial publication. In 1907, Fecht expressed the assumption that it must be spiropentane, a constitutional isomer of vinylcyclopropane. Further evidence for the structure of the hydrocarbon comes from the fact that it could also be obtained f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spiropentane Thermo
Spiropentane is a hydrocarbon with formula . It is the simplest spiro-connected cycloalkane, a triangulane. It took several years after the discovery in 1887 until the structure of the molecule was determined. According to the nomenclature rules for spiro compounds, the systematic name is spiro .2entane. However, there can be no constitutive isomeric spiropentanes, hence the name is unique without brackets and numbers. Synthesis After Gustavson produced cyclopropane by reacting with ground-up zinc metal, he tried the same reaction with (see formula scheme). The starting material is easily obtained by reacting pentaerythritol with hydrobromic acid. A molecule with the formula was obtained. It was called in the initial publication. In 1907, Fecht expressed the assumption that it must be spiropentane, a constitutional isomer of vinylcyclopropane. Further evidence for the structure of the hydrocarbon comes from the fact that it could also be obtained from (see formula scheme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spiropentane Formation
Spiropentane is a hydrocarbon with formula . It is the simplest spiro-connected cycloalkane, a triangulane. It took several years after the discovery in 1887 until the structure of the molecule was determined. According to the nomenclature rules for spiro compounds, the systematic name is spiro .2entane. However, there can be no constitutive isomeric spiropentanes, hence the name is unique without brackets and numbers. Synthesis After Gustavson produced cyclopropane by reacting with ground-up zinc metal, he tried the same reaction with (see formula scheme). The starting material is easily obtained by reacting pentaerythritol with hydrobromic acid. A molecule with the formula was obtained. It was called in the initial publication. In 1907, Fecht expressed the assumption that it must be spiropentane, a constitutional isomer of vinylcyclopropane. Further evidence for the structure of the hydrocarbon comes from the fact that it could also be obtained from (see formula scheme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triangulane
A triangulane is a hydrocarbon consisting exclusively of a series of spiro-linked cyclopropane rings. Triangulanes are named according to the rules of systematic nomenclature for spiro compounds. The pattern of their common names is " 'n''riangulane", where ''n'' is the number of cyclopropane units. The simplest such chemical, riangulane, is named spiro .2entane by systematic nomenclature. Chains consisting of four or more cyclopropane units— riangulane and higher—can form chiral helices. This property is unusual for a molecule that contains no stereogenic atoms; the chiral nature is due to restricted mobility of the chain ends analogous to helicene In organic chemistry, helicenes are ortho-condensed polycyclic aromatic compounds in which benzene rings or other aromatics are angularly annulated to give helically-shaped chiral molecules. The chemistry of helicenes has attracted continuing ... molecules. The rings can form a branched or cyclic patterns. For example, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrocarbon
In organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Hydrocarbons are examples of group 14 hydrides. Hydrocarbons are generally colourless and hydrophobic, and their odors are usually weak or exemplified by the odors of gasoline and lighter fluid. They occur in a diverse range of molecular structures and phases: they can be gases (such as methane and propane), liquids (such as hexane and benzene), low melting solids (such as paraffin wax and naphthalene) or polymers (such as polyethylene and polystyrene). In the fossil fuel industries, ''hydrocarbon'' refers to the naturally occurring petroleum, natural gas and coal, and to their hydrocarbon derivatives and purified forms. Combustion of hydrocarbons is the main source of the world's energy. Petroleum is the dominant raw-material source for organic commodity chemicals such as solvents and polymers. Most anthropogenic (human-generated) emissions of greenhouse gases are carbon di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyclopropanes
Cyclopropane is the cycloalkane with the molecular formula (CH2)3, consisting of three methylene groups (CH2) linked to each other to form a ring. The small size of the ring creates substantial ring strain in the structure. Cyclopropane itself is mainly of theoretical interest but many of its derivatives are of commercial or biological significance. History Cyclopropane was discovered in 1881 by August Freund, who also proposed the correct structure for the substance in his first paper. Freund treated 1,3-dibromopropane with sodium, causing an intramolecular Wurtz reaction leading directly to cyclopropane. The yield of the reaction was improved by Gustavson in 1887 with the use of zinc instead of sodium. Cyclopropane had no commercial application until Henderson and Lucas discovered its anaesthetic properties in 1929; industrial production had begun by 1936. In modern anaesthetic practice, it has been superseded by other agents. Anaesthesia Cyclopropane was introduced into clin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of The Chemical Society
The ''Journal of the Chemical Society'' was a scientific journal established by the Chemical Society in 1849 as the ''Quarterly Journal of the Chemical Society''. The first editor was Edmund Ronalds. The journal underwent several renamings, splits, and mergers throughout its history. In 1980, the Chemical Society merged with several other organizations into the Royal Society of Chemistry. The journal's continuity is found in ''Chemical Communications'', ''Dalton Transactions'', ''Faraday Transactions'', and ''Perkin Transactions'', all of which are published by the Royal Society of Chemistry. History ;'' Proceedings of the Chemical Society'' * ''Memoirs of the Chemical Society of London'' (1841) * ''Proceedings of the Chemical Society of London'' (1842–1843) * ''Memoirs and Proceedings of the Chemical Society'' (1843–1848) * ''Proceedings of the Chemical Society, London'' (1885–1914) * Published as a supplement to ''Journal of the Chemical Society'' from 1914 to 1956 * ''Proc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Propadiene
Propadiene () or allene () is the organic compound with the formula . It is the simplest allene, i.e. a compound with two adjacent carbon double bonds. As a constituent of MAPP gas, it has been used as a fuel for specialized welding. Production and equilibrium with methylacetylene Allene exists in equilibrium with methylacetylene (propyne) and the mixture is sometimes called MAPD for ''m''ethyl''a''cetylene-''p''ropa''d''iene: :H3CC#CH <<=> H2C=C=CH2 for which at 270 °C or 0.1 at 5 °C. MAPD is produced as a side product, often an undesirable one, of of to produce , an important |
Ethene
Ethylene (IUPAC name: ethene) is a hydrocarbon which has the formula or . It is a colourless, flammable gas with a faint "sweet and musky" odour when pure. It is the simplest alkene (a hydrocarbon with carbon-carbon double bonds). Ethylene is widely used in the chemical industry, and its worldwide production (over 150 million tonnes in 2016) exceeds that of any other organic compound. Much of this production goes toward polyethylene, a widely used plastic containing polymer chains of ethylene units in various chain lengths. Ethylene is also an important natural plant hormone and is used in agriculture to force the ripening of fruits. The hydrate of ethylene is ethanol. Structure and properties This hydrocarbon has four hydrogen atoms bound to a pair of carbon atoms that are connected by a double bond. All six atoms that comprise ethylene are coplanar. The H-C-H angle is 117.4°, close to the 120° for ideal sp² hybridized carbon. The molecule is also relatively weak: rotati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thermolysis
Thermal decomposition, or thermolysis, is a chemical decomposition caused by heat. The decomposition temperature of a substance is the temperature at which the substance chemically decomposes. The reaction is usually endothermic as heat is required to break chemical bonds in the compound undergoing decomposition. If decomposition is sufficiently exothermic, a positive feedback loop is created producing thermal runaway and possibly an explosion or other chemical reaction. Decomposition temperature definition A simple substance (like water) may exist in equilibrium with its thermal decomposition products, effectively halting the decomposition. The equilibrium fraction of decomposed molecules increases with the temperature. Examples * Calcium carbonate (limestone or chalk) decomposes into calcium oxide and carbon dioxide when heated. The chemical reaction is as follows: ::CaCO3 → CaO + CO2 :The reaction is used to make quick lime, which is an industrially important product. : ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Recueil Des Travaux Chimiques Des Pays-Bas
The ''Recueil des Travaux Chimiques des Pays-Bas'' was the Dutch scientific journal for chemistry. It was established in 1882, but from 1897 (vol. 16) to 1919 (vol 38) it was published under the title ''Recueil des Travaux Chimiques des Pays-Bas et de la Belgique'' (, CODEN: RTCPB4). From 1980 (vol. 99) to 1984 (vol. 103), the journal was published under the title ''Recueil: Journal of the Royal Netherlands Chemical Society'' (, CODEN: RJRSDK), but in 1985 (vol. 104), the title changed back to the original one. In 1997, the journal merged with ''Chemische Berichte'' and ''Liebigs Annalen'' to form ''Chemische Berichte/Recueil'' and ''Liebigs Annalen/Recueil'', respectively. In 1998 this journal was absorbed by the ''European Journal of Organic Chemistry'' and the ''European Journal of Inorganic Chemistry''. See also * Anales de Química * Chemische Berichte * Bulletin de la Société Chimique de France * Bulletin des Sociétés Chimiques Belges * European Journal of Organic Chemi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of The American Chemical Society
The ''Journal of the American Chemical Society'' is a weekly peer-reviewed scientific journal that was established in 1879 by the American Chemical Society. The journal has absorbed two other publications in its history, the ''Journal of Analytical and Applied Chemistry'' (July 1893) and the ''American Chemical Journal'' (January 1914). It covers all fields of chemistry. Since 2021, the editor-in-chief is Erick M. Carreira (ETH Zurich). In 2014, the journal moved to a hybrid open access publishing model. Abstracting and indexing The journal is abstracted and indexed in Chemical Abstracts Service, Scopus, EBSCO databases, ProQuest databases, Index Medicus/MEDLINE/PubMed, and the Science Citation Index Expanded. According to the ''Journal Citation Reports'', the journal has a 2021 impact factor of 16.383. Editors-in-chief The following people are or have been editor-in-chief: * 1879–1880 – Hermann Endemann * 1880–1881 – Gideon E. Moore * 1881–1882 – Hermann Endemann ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
