Search Results - Ester
Ester
In chemistry, an ester is a compound derived from an acid (either organic or inorganic) in which the hydrogen atom (H) of at least one acidic hydroxyl group () of that acid is replaced by an organyl group (R). These compounds contain a distinctive functional group. Analogues derived from oxygen replaced by other chalcogens belong to the ester category as well. According to some authors, organyl derivatives of acidic hydrogen of other acids are esters as well (e.g. amides), but not according to the IUPAC.Glycerides are fatty acid esters of glycerol; they are important in biology, being one of the main classes of lipids and comprising the bulk of animal fats and vegetable oils. Lactones are cyclic carboxylic esters; naturally occurring lactones are mainly 5- and 6-membered ring lactones. Lactones contribute to the aroma of fruits, butter, cheese, vegetables like celery and other foods.
Esters can be formed from oxoacids (e.g. esters of acetic acid, carbonic acid, sulfuric acid, phosphoric acid, nitric acid, xanthic acid), but also from acids that do not contain oxygen (e.g. esters of thiocyanic acid and trithiocarbonic acid). An example of an ester formation is the substitution reaction between a carboxylic acid () and an alcohol (), forming an ester (), where R stands for any group (typically hydrogen or organyl) and R stands for organyl group.
Organyl esters of carboxylic acids typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. They perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Esters of phosphoric acid form the backbone of DNA molecules. Esters of nitric acid, such as nitroglycerin, are known for their explosive properties.
There are compounds in which an acidic hydrogen of acids mentioned in this article are not replaced by an organyl, but by some other group. According to some authors, those compounds are esters as well, especially when the first carbon atom of the organyl group replacing acidic hydrogen, is replaced by another atom from the group 14 elements (Si, Ge, Sn, Pb); for example, according to them, trimethylstannyl acetate (or trimethyltin acetate) is a trimethylstannyl ester of acetic acid, and dibutyltin dilaurate is a dibutylstannylene ester of lauric acid, and the Phillips catalyst is a trimethoxysilyl ester of chromic acid (). Provided by Wikipedia
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PANDUAN PRAKTIS DIIT DAN KEGIATAN FISIK PASIEN DIABETES MELLITUS TIPE II by Ester Ronauli Sihotang, Ester
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PERLINDUNGAN HUKUM PEJALAN KAKI PADA JALAN-JALAN PROTOKOL DALAM KAJIAN PENDIDIKAN KEWARGANEGARAAN :Studi Kasus di Kota Bandung by Ester
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Rethinking Civil Society in Transition International Donors, Associations and Politics in Tunisia by Sigillò, Ester
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Accelerators in Silicon Valley Building Successful Startups by Ester, Peter
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Chapter Visual Analysis of Robot and Animal Colonies by Martínez, Ester
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Chapter Methods for Reliable Robot Vision with a Dioptric System by Martínez, Ester
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Chapter Indagini sulla poesia del giovane Boccaccio: il segno di Dante nelle terzine della Caccia di Diana by Baldi, Ester
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ANALYSIS OF THE EFFECT OF UNMET NEED FOR FAMILY PLANNING ON UNINTENDED PREGNANCY AT PANTI WILASA CITARUM HOSPITAL SEMARANG by Ester Ratnaningsih
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Flecha, Ramón (1998). Compartiendo palabras. El aprendizaje de las personas adultas a través del diálogo. Barcelona: Paidós by Ester Travé
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Marx e Lukács e o problema da individualidade: algumas aproximações by Ester Vaisman
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Quando danço o mundo me parece acolhedor e hamonioso by Ester Buffa
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Tango: atração e relutância by Ester Buffa
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Accelerators in Silicon Valley Building Successful Startups by Ester, Peter
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14
Practices of Wealth Depositing in the 1st-9th Century AD Eastern Baltic by Oras, Ester
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15
Chapter Methods for Reliable Robot Vision with a Dioptric System by Martínez, Ester
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16
Chapter Visual Analysis of Robot and Animal Colonies by Martínez, Ester
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17
Chapter Indagini sulla poesia del giovane Boccaccio: il segno di Dante nelle terzine della Caccia di Diana by Baldi, Ester
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18
Rethinking Civil Society in Transition International Donors, Associations and Politics in Tunisia by Sigillò, Ester
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19
HUBUNGAN KEPUASAN KERJA TERHADAP KOMITMEN KARYAWAN PADA ORGANISASI : Penelitian terhadap Pegawai di Kantor Pusat Litbang Teknologi Mineral dan Batubara Kota Bandung by Ester Ledyana, -
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RELASI MULTIKULTURAL ETNIS TIONGHUA DENGAN ETNIS SUNDA (Studi Deskriptif di Pecinan Cibadak Kota Bandung) by Ester Alventia, -
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