2,5-Dichlorbenzoesaeure

Bezeichnung:2,5-Dichlorbenzoesaeure

CAS-Nr50-79-3

Englisch Name:2,5-Dichlorobenzoic acid

CBNumberCB7121450

SummenformelC7H4Cl2O2

Molgewicht191.01

MOL-Datei50-79-3.mol

Synonyma

2,5-Dichlorbenzoesaeure

2,5-Dichlorbenzoesaeure physikalisch-chemischer Eigenschaften

Schmelzpunkt	151-154 °C (lit.)
Siedepunkt	301 °C (lit.)
Dichte	1.4410 (rough estimate)
Brechungsindex	1.4590 (estimate)
Flammpunkt	300-302°C
storage temp.	Store below +30°C.
Löslichkeit	0.8g/l
pka	2.51±0.25(Predicted)
Aggregatzustand	Powder
Farbe	White to beige
Wasserlöslichkeit	<0.1 g/100 mL at 19 ºC
BRN	973353
Stabilität	Stable.
CAS Datenbank	50-79-3(CAS DataBase Reference)
NIST chemische Informationen	Benzoic acid, 2,5-dichloro-(50-79-3)
EPA chemische Informationen	Benzoic acid, 2,5-dichloro- (50-79-3)

Sicherheit

Kennzeichnung gefährlicher	Xi
R-Sätze:	36/37/38
S-Sätze:	26-36-24/25
WGK Germany	3
RTECS-Nr.	DG6825000
TSCA	Yes
HS Code	29163900

Gefahreninformationscode (GHS)

2,5-Dichlorobenzoic acid Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S24/25:Berührung mit den Augen und der Haut vermeiden.
Chemische Eigenschaften
Needle crystals or white crystalline powder. Soluble in ethanol and ether, soluble in hot water. Some volatilize in the vapor.
Verwenden
2,5-Dichlorobenzoic acid was used as calibration standard to investigate the gas-phase OH reaction products of biphenyl, monochlorobiphenyl and dichlorophenyl
Application
2,5-Dichlorobenzoic acid is used in organic synthesis and pesticide intermediates. It is used to synthesize herbicides chloramben, 2,5-Dichloro-3-nitrobenzoic acid, etc. The pesticide has less phytotoxicity and is not affected by rainy days.
synthetische
2,5-Dichlorobenzoic acid is obtained by reacting p-dichlorobenzene with phosgene to obtain 2,5-dichlorobenzoyl chloride, which is then hydrolyzed.
Definition
ChEBI: 2,5-dichlorobenzoic acid is a chlorobenzoic acid that is benzoic acid in which the ring hydrogens at positions 2 and 5 are substituted by chloro groups. It is a chlorobenzoic acid and a dichlorobenzene.
Allgemeine Beschreibung
Needles (from water) or white powder.
Air & Water Reaktionen
Insoluble in water.
Reaktivität anzeigen
Carboxylic acids donate hydrogen ions if a base is present to accept them. They react in this way with all bases, both organic (for example, the amines) and inorganic. Their reactions with bases, called "neutralizations", are accompanied by the evolution of substantial amounts of heat. Neutralization between an acid and a base produces water plus a salt. Carboxylic acids with six or fewer carbon atoms are freely or moderately soluble in water; those with more than six carbons are slightly soluble in water. Soluble carboxylic acid dissociate to an extent in water to yield hydrogen ions. The pH of solutions of carboxylic acids is therefore less than 7.0. Many insoluble carboxylic acids react rapidly with aqueous solutions containing a chemical base and dissolve as the neutralization generates a soluble salt. Carboxylic acids in aqueous solution and liquid or molten carboxylic acids can react with active metals to form gaseous hydrogen and a metal salt. Such reactions occur in principle for solid carboxylic acids as well, but are slow if the solid acid remains dry. Even "insoluble" carboxylic acids may absorb enough water from the air and dissolve sufficiently in 2,5-Dichlorobenzoic acid to corrode or dissolve iron, steel, and aluminum parts and containers. Carboxylic acids, like other acids, react with cyanide salts to generate gaseous hydrogen cyanide. The reaction is slower for dry, solid carboxylic acids. Insoluble carboxylic acids react with solutions of cyanides to cause the release of gaseous hydrogen cyanide. Flammable and/or toxic gases and heat are generated by the reaction of carboxylic acids with diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides. Carboxylic acids, especially in aqueous solution, also react with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), to generate flammable and/or toxic gases and heat. Their reaction with carbonates and bicarbonates generates a harmless gas (carbon dioxide) but still heat. Like other organic compounds, carboxylic acids can be oxidized by strong oxidizing agents and reduced by strong reducing agents. These reactions generate heat. A wide variety of products is possible. Like other acids, carboxylic acids may initiate polymerization reactions; like other acids, they often catalyze (increase the rate of) chemical reactions.
Brandgefahr
Flash point data for 2,5-Dichlorobenzoic acid are not available; however, 2,5-Dichlorobenzoic acid is probably combustible.
läuterung methode
Crystallise the acid from water. [Beilstein 9 IV 1005.] Aromatic acid impurities (to <0.05%) can be removed via the (±)--methylbenzylamine salt as described for 2,4-dichlorobenzoic acid [Ley & Yates Organic Process Research & Development 12 120 2008.]

2,5-Dichlorobenzoic acid Upstream-Materialien And Downstream Produkte

2,5-Dichlorbenzoesaeure Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

50-79-3, 2,5-Dichlorobenzoic acid Verwandte Suche:

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