General Description
White slightly cream or light pink-colored powder. Melting point 177°C. Slight phenolic odor and a saline phenolic taste. Moderately toxic. Used as a fungicide and bactericide.
Reactivity Profile
DICHLOROPHENE(97-23-4) is incompatible with strong oxidizing agents and strong bases . Weakly acidic.
Air & Water Reactions
Slowly oxidized in air. Insoluble in water.
Fire Hazard
Flash point data for this chemical are not available; however, DICHLOROPHENE is probably combustible.
Chemical Properties
white or off-white powder
Originator
Dichlorophen,Aquapharm
Uses
Agricultural fungicide; antimicrobial; germicide in soaps, shampoos, etc.
Uses
Dichlorophen exhibits algicidal, bactericidal and fungicidal activities.
It is a contact fungicide used to control dollar spots and rots in turf. It
is also an anthelminthic used for the treatment of various tapeworms in
human and domestic animals.
Definition
ChEBI: Dichlorophen is a diarylmethane and a bridged diphenyl fungicide.
Manufacturing Process
2.520 g of sulfuric acid (93%) is stirred and cooled to 0°C. A solution of 552 g of p-chlorophenol in 305 g of methyl alcohol is run into the acid, the
temperature being kept below 10°C. The mixture is cooled to -5°C and a
solution of 170 g of aqueous formaldehyde solution (37% CH2O in water) in
332 g of methyl alcohol is introduced at a more or less uniform rate over a
period of 4 hours. The temperature of the reaction mixture is not allowed to
rise above 0°C. After all of the formaldehyde-containing solution has been
added, the batch is stirred for 3 hours longer at a temperature of -5°-0°C.
Enough ice is then added to the contents of the reaction chamber in order to
reduce the sulfuric acid concentration to 70%. 2,2'-Dihydroxy-5,5'-dichlorodiphenyl methane is extracted from the resulting mixture with a mixture of
1.069 g of isopropyl ether and 1.575 g of toluene. Ice is added until the acid
concentration is about 30%. The acid layer is removed and the solvent layer is
washed acid-free. Most of the isopropyl ether is removed by atmospheric
distillation with a fractionating column, the temperature of the escaping
vapors not being permitted to exceed 90°C. From the residue, about 280 g of
pure 2,2'-dihydroxy-5,5'-dichloro-diphenyl methane, MP: 177°-178°C,
crystallize. The product is filtered, washed with toluene and dried at about
100°C. By concentrating the mother liquor remaining after the foregoing
crystallization and filtration, another 225 grams of substantially pure 2,2'-
dihydroxy-5,5'-dichloro-diphenyl methane are obtained. This latter crop may
be crystallized from toluene in order to convert it into 2,2'-dihydroxy-5,5'-
dichlorodiphenyl methane of melting point of 177°-178°C.
Therapeutic Function
Antiseptic, Anthelmintic, Antifungal
Agricultural Uses
Fungicide, Herbicide, Bactericide, Veterinary
medicine: Not currently registered in the U.S. Dichlorophene
is a wide-spectrum, non-oxidizing biocide used against
all types of algae and bacteria. Widely used to treat fungi,
fleas and worm conditions in pet animals and livestock.
See U.S. Food and Drug Administration 20 CFR 520.580
and 20 CFR 520.581
Trade name
ANTHIPHEN®; DIPHENTANE
70®; DICHLOROPHEN®; DICHLOROPHEN
B®; DICHLOROPHENE 10®; DICHLORPHEN®;
DIDROXANE®; DIPHENTHANE 70®; FUNGICIDE
F®; FUNGICIDE GM®; FUNGICIDE M®; G 4®;
GEFIR®; HYOSAN; KORIUM®; PLATH-LYSE®;
PREVENTAL®; PREVENTOL®; PREVENTOL
GD®; PREVENTOL GDC®; SUPER MOSSTOX®;
TAENIATOL®; TENIATOL®; TENIATHANE®;
TRIVEX®; VERMITHANA®; WESPURIL®
Metabolic pathway
Limited information is available to describe the degradation and
metabolic fate of dichlorophen. A photodegradation study showed that
dichlorophen undergoes hydroxydechlorination and dechlorination
reactions as the major degradation pathways. Direct conjugation of
one or both hydroxyl groups with sulfate and/or glucuronic acid was
observed as the major metabolic pathway in the rat.
Purification Methods
Crystallise dichlorophen from toluene. [Beilstein 6 III 5406.]
Degradation
Dichlorophen (1) underwent hydroxydechlorination in acidic solution
(pH 5.6) when irradiated under a xenon lamp (280 and 300 nm). 4-Chloro-
4'-hydroxy-2,2'-methylenediphenol(2) was the major product from reactions
conducted in the absence of oxygen. A benzoquinone-like tautomer
(3) was detected in oxygenated solution. A dechlorination product [4-
chloro-2,2'-methylenediphenol(4)] was also observed as a minor product
(Mansfield and Richard, 1996). These pathways are shown in Scheme 1.
