benzoic acid

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benzoic acid

(bĕnzō`ĭk), C6H5CO2H, crystalline solid organic acid that melts at 122°C; and boils at 249°C;. It is the simplest aromatic carboxylic acid (see aryl grouparyl group
, in chemistry, group of atoms derived from benzene or from a benzene derivative by removing one hydrogen that is bonded to the benzene ring (see radical). The simplest aryl group is phenyl, C6H5 ; it is derived from benzene.
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 and carboxyl groupcarboxyl group
, in chemistry, functional group that consists of a carbon atom joined to an oxygen atom by a double bond and to a hydroxyl group, OH, by a single bond. Carboxylic acids are compounds whose molecules contain a carboxyl group that is joined to a hydrogen atom, an
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). In addition to being synthesized from a variety of organic compounds (e.g., benzyl alcohol, benzaldehyde, toluene, and phthalic acid), it may be obtained from resins, notably gum benzoinbenzoin
or benzoinum
, balsamic resin, the dried exudation from the pierced bark of various species of the benzoin tree (Styrax) native to Sumatra, Java, and Thailand; appearing as red-brown to yellow-brown tears.
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. It is used largely for making its salts and esters, most notably sodium benzoate, which is widely used as a preservative in foods and beverages and as a mild antiseptic in mouthwashes and toothpastes.

Benzoic Acid

 

the simplest aromatic acid, C6H5COOH; it forms clear, lustrous crystals. It was first isolated by sublimation at the beginning of the 17th century from benzoic resin (benzoin gum), hence its name. Its melting point is 122° C. Benzoic acid is readily soluble in organic solvents; it is poorly soluble in water. It sublimates readily and is distilled with steam. Benzoic acid is obtained by the oxidation of toluene with nitric or chromic acid, as well as by the decarboxylation of phthalic acid.

Benzoic acid in the form of complex esters and salts is contained in various natural essential oils—for example, clove oil. In medicine it is used externally in cases of skin diseases as an antiseptic and fungicidal agent; its sodium salt is used as an expectorant. In addition, the sodium salt is used in the preservation of foodstuffs. The esters of benzoic acid (from methyl to amyl), which have a strong odor, are used in the perfume industry. Various derivatives of benzoic acid— for example, chlorobenzoic and nitrobenzoic acids—are used in the synthesis of dyes.

benzoic acid

[ben′zō·ik ′as·əd]
(organic chemistry)
C6H5COOH An aromatic carboxylic acid that melts at 122.4°C, boils at 250°C, and is slightly soluble in water and relatively soluble in alcohol and ether; derivatives are valuable in industry, commerce, and medicine.
References in periodicals archive ?
Benzoic acid, valeric acid, butyric acid and propionic acid were obtained from Merck, whereas phenolphthalein and sodium hydroxide were reagent grade.
Adsorption of benzoic acid from aqueous solution by three kinds of modified bentonites.
Adsorption of benzoic acid by CTAB exchanged montmorillonite.
For the first trial and to investigate the effect of benzoic acid on turkeys' performance, data was statistically analysed by analysis of variance using the PROC MIXED procedure of SAS (1989) with replication in time considered as a random effect.
In this study a basal diet (Table 1) was supplemented with various feed additives (one of the following compounds: benzoic acid, thymol, a mixture of essential oil blends (MEO) and a combination of benzoic acid and MEO (BMEO group) in order to study their effect on growth performance and certain health related parameters of turkey poults.
In the first experiment, benzoic acid was added in the basal feed at the levels of 300 mg/kg and 1,000 mg/kg resulting in the B300 and B1,000 groups respectively.
Effect of combination of benzoic acid and MEO on growth performance
Table 6: NMR chemical shielding tensors data of polyphenol compound (Benzoic acid) Compound NMR Values Number Isotropic Atomic [DELTA] [eta] Of determinant charge [sigma] Atom Benzoic Acid C1 -7.
In 1988, synthetic method for 3,4- AHBA was reported by DOW, 3,4-AHBA could be obtained through electrolytic reduction of 3-nitro-4- hydroxyl benzoic acid (3,4-NHBA) in alkaline medium.
When reaction completed, instead of Acidifying the reaction mixture directly, the reaction mixture was cooled down and filtered to get the crystal of 3-nitro-4-hydroxyl benzoic acid disodium salt (3,4-NHBA-2Na) and initial filtrate.