Dictionary, Defintion, Meaning, What is Ergosterol, Esterification, Ergot, Erubescite, Esr, Essential Element, Esterification, Ethanamide, Ethane, Ethanediol

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Home >> Chemistry Dictionary >>Ergosterol - Esterification

Your Ad Here	Ergosterol. A sterol which is found in fungi, bacteria, algae and higher plants. It gets converted into vitamin D₂ by the action of ultraviolet light. Ergot. Sclerotium of the fungus Claviceps purpurea, which develops in the ovary and replaces the grain of rye. Ergot owes its pharmacological activity almost entirely to the alkaloids ergotoxine, ergometrine and ergotamine. Ergotamine. C₃₃H₃₅N₅O₅. One of the ergot alkaloids
Erubescite. Cu₃FeS₃. Cu ore. Erythro. A prefix used to distinguish one diastereomer from the other threo form which is based upon an analogy to erythrose and threose. The erythro diastereomer is defined as the one in which at leas two sets of similar substituents on adjacent asymmetric carbons are in the eclipsed configuration. A Newman projection of the above ecrythro form is
Es. Einsteinium. ESCA. (electron spectroscopy for chemical analysis) see photoelectron spectroscopy. Esr. Electron spin resonance. Essential element. Refers to any of a number of elements required by living organisms to ensure normal growth, development and maintenance. Ethanamide, acetamide. CH₃CO.NH₂. Crystalizes in long white needles which absorb water and finally liquety. The curde substance has a strong odour of mice; m.p. 82°C, b.p. 222°C. Prepared by the dry distillation of ammonium ethanoate or by the action of ammonia on ethyl ethanoate.	Your Ad Here
Essential Oil. A natural oil with a distinctive scent secreted by the glands of certain aromatic plants. Terpenes are the main constituents. Essential oils are extracted from plants by steam distillation, extraction with cold neutral fats or solvents (e.g. alcohol), or pressing and used in perfumes, flavourings, and medicine. Examples are citrus oils, flower oils (e.g. rose, jasmine), and oil of cloves. Esterfication. The process of formation of esters by the combination of an acid with an alcohol.
Your Ad Here	Esters. Organic compounds formed by the union of an acid and an alcohol with elimination of water. They are volatile liquids or low-melting solids and are usually insoluble in water but soluble in alcohol or ether. Et. Ethyl, C₂H₅-. Ethanal, acetaldehyde. CH₃.CHO. Colourless liquid with a characteristic odour; b.p. 20.8°C. Miscible with water, alcohol and ether; insoluble in concentrated calcium chloride solutions.

Ethane. CH₃.CH₃. Colourless, odourless gas; forms an explosive mixture with air, b.p. - 89°C. It occurs in natural gas. May be prepared by reduction of ethane or Ethyne by hydrogen under pressure in the presence of a nickel catalyst, or by the electrolysis of a solution of potassium ethanoate. It has the general properties of the paraffins. Used in low temperature refrigeration plant.

Ethanediol. CH₂OH – CH₂OH A colourless symrupy liquid (b.p. 1100k) sweet in taste. It is miscible with water and ethanol.

Ethanoic acid (acetic acid). A clear viscous liquid or glassy solid carboxylic acid, CH3COOH, with a characteristically sharp odour of vinegar; r.d. 1.049; m.p. 16.7°C; b.p. 118.5°C. The pure compound is called glacial ethanoic acid. It is manufactured by the oxidation of ethanol or by the oxidation of butane in the presence of dissolved managanese (II) or cobalt (II) ethanoates at 200°C, and is used in making ethanoates anhydride for producing cellulose ethanoates. It is also used in making ethenyl ethanoate (for polyvinylacetate). The compound is formed by the fermentation of alcohol and is present in vinegar, which is made by fermenting bear or wine. ‘Vinegar’ made from ethanoic acid with added colouring matter is called ‘nonbrewed condiment’.

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