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Thiepane
Thiepane is the organosulfur compound with the formula (CH2)6S. Thiepanes are seven-membered ring heterocycles that contains sulfide. The parent thiepane has seldom been studied. A variety of derivatives are known. Hexathiathiepane (CAS RN 17233-71-5, m.p. 90 °C) is CH2S6. A naturally occurring derivative is lenthionine Lenthionine is a cyclic organosulfur compounds, organosulfur compound found in shiitake mushrooms, Onion, onions, and garlic, and it is partly responsible for their flavor. The mechanism of its formation is unclear, but it likely involves the en ..., 1,4-(CH2)2S5. Thiepane (hexathiophane) itself may be a product of spontaneous coal fires in post-mining waste heaps. Reference {{Heterocyclic-stub Sulfur heterocycles Seven-membered rings ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Organosulfur Compound
Organosulfur compounds are organic compounds that contain sulfur. They are often associated with foul odors, but many of the sweetest compounds known are organosulfur derivatives, e.g., saccharin. Nature abounds with organosulfur compounds—sulfur is vital for life. Of the 20 common amino acids, two (cysteine and methionine) are organosulfur compounds, and the antibiotics penicillin and sulfa drugs both contain sulfur. While sulfur-containing antibiotics save many lives, sulfur mustard is a deadly chemical warfare agent. Fossil fuels, coal, petroleum, and natural gas, which are derived from ancient organisms, necessarily contain organosulfur compounds, the removal of which is a major focus of oil refineries. Sulfur shares the chalcogen group with oxygen, selenium, and tellurium, and it is expected that organosulfur compounds have similarities with carbon–oxygen, carbon–selenium, and carbon–tellurium compounds. A classical chemical test for the detection of sulfur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lenthionine
Lenthionine is a cyclic organosulfur compound found in shiitake mushrooms, onions, and garlic, and it is partly responsible for their flavor. The mechanism of its formation is unclear, but it likely involves the enzyme C–S lyase. Preparation Lenthionine has been isolated from mushrooms by submerging them in water and allowing them to set overnight. The mushrooms were then centrifuged, and dissolved in chloroform, which was later evaporated to form a yellow oil layer. Chromatography was then used to isolated the lenthionine. Lenthionine has been prepared ''in situ'' bubbling hydrogen sulfide gas through a solution of sulfur and sodium sulfide until the pH reached 8. Then, the solution had a large amount of dichloromethane Dichloromethane (DCM or methylene chloride, methylene bichloride) is an organochlorine compound with the formula . This colorless, volatile liquid with a chloroform-like, sweet odour is widely used as a solvent. Although it is not miscible wit ... a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heterocycle
A heterocyclic compound or ring structure is a cyclic compound that has atoms of at least two different elements as members of its ring(s). Heterocyclic chemistry is the branch of organic chemistry dealing with the synthesis, properties, and applications of these heterocycles. Examples of heterocyclic compounds include all of the nucleic acids, the majority of drugs, most biomass (cellulose and related materials), and many natural and synthetic dyes. More than half of known compounds are heterocycles. 59% of US FDA-approved drugs contain nitrogen heterocycles. Classification The study of heterocyclic chemistry focuses especially on unsaturated derivatives, and the preponderance of work and applications involves unstrained 5- and 6-membered rings. Included are pyridine, thiophene, pyrrole, and furan. Another large class of heterocycles refers to those fused to benzene rings. For example, the fused benzene derivatives of pyridine, thiophene, pyrrole, and furan are quinol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sulfur Heterocycles
Sulfur (or sulphur in British English) is a chemical element with the symbol S and atomic number 16. It is abundant, multivalent and nonmetallic. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8. Elemental sulfur is a bright yellow, crystalline solid at room temperature. Sulfur is the tenth most abundant element by mass in the universe and the fifth most on Earth. Though sometimes found in pure, native form, sulfur on Earth usually occurs as sulfide and sulfate minerals. Being abundant in native form, sulfur was known in ancient times, being mentioned for its uses in ancient India, ancient Greece, China, and ancient Egypt. Historically and in literature sulfur is also called brimstone, which means "burning stone". Today, almost all elemental sulfur is produced as a byproduct of removing sulfur-containing contaminants from natural gas and petroleum.. Downloahere The greatest commercial use of the element is the production of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
