Pentyl acetate is an organicester. Its chemical formula is CH3CH2CH2CH2CH2OC(=O)CH3 and the molecular weight is 130.18 g/mol. It has the distinctive scent of banana.
Pentyl acetate is the ester resulting from the condensation of acetic acid and pentanol.
Category:AcetatesCategory:Esters
Ester
In chemistry, esters are organic compounds in which an organic group (symbolised by R' in this article) replaces a hydrogenatom (or more than one) in an oxygenacid. An oxygen acid is an acid whose molecule has an - group from which the hydrogen (H) can dissociate as an H+ion.
The most common esters are the carboxylate esters, where the acid in question is a carboxylic acid. For example, if the acid is acetic acid, the ester is called an acetate. Esters may also be formed with inorganic acids; for example, dimethyl sulfate is an ester, and sometimes called "sulfuric acid, dimethyl ester".
Esters are named similarly to salts; although they don't really have cations and anions, the terminology follows the same pattern: a more electropositive part followed by a more electronegative part.
An ester can be thought of as a product of a condensation reaction of an acid (usually an organic acid) and an alcohol (or phenol compound), although there are other ways to form esters. Condensation is a type of chemical reaction in which two molecules with -OH groups are joined with eliminating a water molecule from their -OH groups. A condensation reaction to form an ester is called esterification. Esterification can be catalysed by the presence of H+ ions. Sulfuric acid is often used as a catalyst for this reaction. The name ester is derived from the German Essig-Äther, an old name for acetic acid ethyl ester (ethyl acetate).
Naming of esters
ethyl acetate
Esters can be produced by an equilibrium reaction between an alcohol and a carboxylic acid. The ester is named according to the alkyl group (the part from the alcohol) and then the alkanoate (the part from the carboxylic acid) which make it up. For example, the reaction between methanol and butyric acid yields the ester methyl butyrate C3H7-COO-CH3 (as well as water). The simplest ester is H-COO-CH3 (methyl formate, also called methyl methanoate).
For esters derived from the simplest carboxylic acids, the traditional names names are recommended by IUPAC, viz, formate, acetate, propionate, butyrate, though out of these only acetate may carry further substituents. For esters from higher acids, the alkane name with an -oate ending is generally preferred, e.g., hexanoate. Common esters of aromatic acids include benzoates such as methyl benzoate, and phthalates, with substitution allowed in the name.
jasmine
Esters may undergo hydrolysis - the breakdown of an ester by water. This process can be catalyzed both by acids and bases. The base-catalyzed process is called saponification. The hydrolysis yields an alcohol and a carboxylic acid or its carboxylatesalt.
Esters also react if heated with primary or secondary amines, producing amides.
Phenyl esters react to hydroxyarylketones in the Fries rearrangement.
External links
- [http://www.chm.bris.ac.uk/motm/ethylacetate/ethylh.htm Molecule of the month: Ethyl acetate and other esters]
Pentanol, more properly called 1-pentanol, is a higher alcohol with a five carbon atoms and a general formula of C5H11OH.
H H H H H
| | | | |
H - C - C - C - C - C - OH
| | | | |
H H H H H
Also see amyl alcohol. Pentanol is colourless at room temperature. However, it does possess a choking aroma. It has 8 general isomers.
Category:Alcohols
Shuleykin is a small lunarimpact crater that lies to the south of Mare Orientale, within the ring-shaped Montes Rook. It is located just on the far side of the Moon, but this area can be viewed from the Earth during periods of favorable libration and lighting. (Although it can only be seen from the edge, except from orbit.)
This crater was formed following the Oriantale impact event, and so is younger. It has a circular, sharp-edged rim and inner walls that slope down to the small interior floor. It has not been noticeably eroded by subsequent impacts.
Category:Craters on the Moon
Phoenix Television (鳳凰衛星電視) is a Hong Kong-based Mandarin Chinese television broadcaster that aims to promote a free flow of information and entertainment within the Greater China region. It has 5 different television channels. Phoenix Television is well-known of providing Infotainment programmes with popular 'Star' Anch
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R. Buckminster Fuller commemorating Buckminster Fuller and his contributions to architecture and science, some of his inventions are visible. Most notably, his head is shaped after one of his geodesic domes. Other elements, such as futuristic cars, other craft and radar dishes are also present.]]
Richard Buckminster "
Carbonated
Carbonation occurs when carbon dioxide is dissolved in water or an aqueoussolution. This process is generally represented by the following reaction, where water and gaseous carbon dioxide react to form a dilute solution of carbonic acid.
:H2O + CO2 ↔ H2
