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1,4-Dihydroxybenzol Produkt Beschreibung

Hydroquinone Struktur
123-31-9
CAS-Nr.
123-31-9
Bezeichnung:
1,4-Dihydroxybenzol
Englisch Name:
Hydroquinone
Synonyma:
HQ;he5;HE 5;Artra;diak5;QUINOL;Diak 5;Melanex;tenoxhq;Phiaquin
CBNumber:
CB6717931
Summenformel:
C6H6O2
Molgewicht:
110.11
MOL-Datei:
123-31-9.mol

1,4-Dihydroxybenzol Eigenschaften

Schmelzpunkt:
172-175 °C(lit.)
Siedepunkt:
285 °C(lit.)
Dichte
1.32
Dampfdichte
3.81 (vs air)
Dampfdruck
1 mm Hg ( 132 °C)
Brechungsindex
1.6320
Flammpunkt:
165 °C
storage temp. 
Store below +30°C.
Löslichkeit
H2O: 50 mg/mL, clear
Aggregatzustand
Needle-Like Crystals or Crystalline Powder
pka
10.35(at 20℃)
Farbe
White to off-white
Wasserlöslichkeit
70 g/L (20 ºC)
Sensitive 
Air & Light Sensitive
Merck 
14,4808
BRN 
605970
Henry's Law Constant
(x 10-9 atm?m3/mol): <2.07 at 20 °C (approximate - calculated from water solubility and vapor pressure)
Expositionsgrenzwerte
NIOSH REL: 15-min ceiling 2, IDLH 50; OSHA PEL: TWA 2; ACGIH TLV: TWA 2 (adopted).
Stabilität:
Stable. Combustible. Incompatible with strong oxidizing agents, strong bases, oxygen, ferric salts. Light and air-sensitive. Discolours in air.
InChIKey
QIGBRXMKCJKVMJ-UHFFFAOYSA-N
CAS Datenbank
123-31-9(CAS DataBase Reference)
NIST chemische Informationen
Hydroquinone(123-31-9)
IARC
3 (Vol. 15, Sup 7, 71) 1999
EPA chemische Informationen
Hydroquinone (123-31-9)
Sicherheit
  • Risiko- und Sicherheitserklärung
  • Gefahreninformationscode (GHS)
Kennzeichnung gefährlicher Xn,N
R-Sätze: 22-40-41-43-50-68-R68-R50-R43-R41-R40-R22
S-Sätze: 26-36/37/39-61-S61-S36/37/39-S26
RIDADR  2662
WGK Germany  3
RTECS-Nr. MX3500000
Selbstentzündungstemperatur 930 °F
TSCA  Yes
HazardClass  9
PackingGroup  III
HS Code  29072210
Giftige Stoffe Daten 123-31-9(Hazardous Substances Data)
Toxizität LD50 orally in rats: 320 mg/kg (Woodard)
Bildanzeige (GHS)
Alarmwort Achtung
Gefahrenhinweise
Code Gefahrenhinweise Gefahrenklasse Abteilung Alarmwort Symbol P-Code
H302 Gesundheitsschädlich bei Verschlucken. Akute Toxizität oral Kategorie 4 Warnung P264, P270, P301+P312, P330, P501
H317 Kann allergische Hautreaktionen verursachen. Sensibilisierung der Haut Kategorie 1A Warnung P261, P272, P280, P302+P352,P333+P313, P321, P363, P501
H318 Verursacht schwere Augenschäden. Schwere Augenschädigung Kategorie 1 Achtung P280, P305+P351+P338, P310
H341 Kann vermutlich genetische Defekte verursachen. Keimzellmutagenität Kategorie 2 Warnung P201,P202, P281, P308+P313, P405,P501
H351 Kann vermutlich Krebs verursachen. Karzinogenität Kategorie 2 Warnung P201, P202, P281, P308+P313, P405,P501
H400 Sehr giftig für Wasserorganismen. Kurzfristig (akut) gewässergefährdend Kategorie 1 Warnung P273, P391, P501
H410 Sehr giftig für Wasserorganismen mit langfristiger Wirkung. Langfristig (chronisch) gewässergefährdend Kategorie 1 Warnung P273, P391, P501
Sicherheit
P201 Vor Gebrauch besondere Anweisungen einholen.
P273 Freisetzung in die Umwelt vermeiden.
P280 Schutzhandschuhe/Schutzkleidung/Augenschutz tragen.
P305+P351+P338 BEI KONTAKT MIT DEN AUGEN: Einige Minuten lang behutsam mit Wasser spülen. Eventuell vorhandene Kontaktlinsen nach Möglichkeit entfernen. Weiter spülen.
P308+P313 BEI Exposition oder falls betroffen: Ärztlichen Rat einholen/ärztliche Hilfe hinzuziehen.
P501 Inhalt/Behälter ... (Entsorgungsvorschriften vom Hersteller anzugeben) zuführen.

1,4-Dihydroxybenzol Chemische Eigenschaften,Einsatz,Produktion Methoden

ERSCHEINUNGSBILD

FARBLOSE KRISTALLE.

PHYSIKALISCHE GEFAHREN

Staubexplosion der pulverisierten oder granulierten Substanz in Gemischen mit Luft möglich.

CHEMISCHE GEFAHREN

Reagiert sehr heftig mit Natriumhydroxid.

ARBEITSPLATZGRENZWERTE

TLV: 2 mg/m?(als TWA); Krebskategorie A3 (bestätigte krebserzeugende Wirkung beim Tier mit unbekannter Bedeutung für den Menschen); (ACGIH 2005).
MAK: Hautresorption; Krebserzeugend Kategorie 2; Keimzellmutagen Kategorie 3A; (DFG 2005).

AUFNAHMEWEGE

Aufnahme in den Körper durch Inhalation, über die Haut und durch Verschlucken.

INHALATIONSGEFAHREN

Beim Verdampfen bei 20°C tritt eine gesundheitsschädliche Kontamination der Luft nicht oder nur sehr langsam ein

WIRKUNGEN BEI KURZZEITEXPOSITION

WIRKUNGEN BEI KURZZEITEXPOSITION:
Die Substanz reizt stark die Augen. Die Substanz reizt die Haut und die Atemwege.

WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION

Wiederholter oder andauernder Hautkontakt kann zu Dermatitis und Hautsensibilisierung führen. Möglich sind Auswirkungen auf Augen und Haut. Führt zu Verfärbung der Bindehaut und Hornhaut, sowie Pigmentverlust der Haut. Möglicherweise krebserzeugend für den Menschen.

LECKAGE

Verschüttetes Material in abdichtbaren Behältern sammeln; falls erforderlich durch Anfeuchten Staubentwicklung verhindern. Reste sorgfältig sammeln. An sicheren Ort bringen. Persönliche Schutzausrüstung: Atemschutzgerät, P2-Filter für schädliche Partikel. NICHT in die Umwelt gelangen lassen.

R-Sätze Betriebsanweisung:

R22:Gesundheitsschädlich beim Verschlucken.
R40:Verdacht auf krebserzeugende Wirkung.
R41:Gefahr ernster Augenschäden.
R43:Sensibilisierung durch Hautkontakt möglich.
R50:Sehr giftig für Wasserorganismen.
R68:Irreversibler Schaden möglich.

S-Sätze Betriebsanweisung:

S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S61:Freisetzung in die Umwelt vermeiden. Besondere Anweisungen einholen/Sicherheitsdatenblatt zu Rate ziehen.

Aussehen Eigenschaften

1,4 - Hydrochinon
Summenformel: C6H6O2

Gefahren für Mensch und Umwelt

Gesundheitsschädlich beim Einatmen und Verschlucken.
Zu vermeidende Bedingungen: Licht- und Luftempfindlich. Zu vermeidende Stoffe: Starke Oxidationsmittel, Säuren. Säureanhydride, Säurechloride, Eisen und Eisensalze.
Gefährliche Zersetzungsprodukte: Kohlenmonoxid, Kohlendioxid,
Gesundheitsschädlich beim Verschlucken, Einatmen oder Aufnahme durch die Haut.
Reizt die Augen und die Haut. Reizwirkung auf die Schleimhäute und die oberen Atemwege. Fruchtschädigende Substanz.
Krebserzeugend (Gr. III A 2; DFG)
Wassergefährdungsklasse 2 (Nr. 128)

Schutzmaßnahmen und Verhaltensregeln

Behälter dicht geschlossen halten. An einem trockenen, kühlen Platz lagern.
Schutzbrille mit Seitenschutz.
Chemikalienresistente Schutzhandschuhe.

Verhalten im Gefahrfall

Feste Bestandteile mechanisch aufnehmen. Nicht in Oberflächenwasser und Kanalisation gelangen lassen.
Geeignete Löschmittel: Kohlendioxid, Trockenlöschmittel oder geeigneter Schaum.

Erste Hilfe

Nach Hautkontakt: Nach Berührung sofort mit Seife und viel Wasser abwaschen.
Nach Augenkontakt: 15 Minuten bei gespreizten Lidern unter fließendem Wasser ausspülen. Augenarzt konsultieren!
Nach Einatmen: Nach Einatmen, Person sofort an die frische Luft bringen.
Nach Verschlucken: Reichlich Wasser nachtrinken und unverzüglich Arzt zu Rate ziehen.
Nach Kleidungskontakt: Benetzte Kleidungsstücke sofort ausziehen, ggf. auch die Unterwäsche.
Ersthelfer: siehe gesonderten Anschlag

Sachgerechte Entsorgung

Falls Recycling nicht möglich, die Substanz zur Sonderabfallverbrennung geben. Auskunft: Hr. Riepl (8884711) od. Hr. Uhl für Klinikum (2015557).

Beschreibung

Hydroquinone (HQ) is produced by the oxidation of aniline or phenol, by the reduction of quinone, or from a reaction of acetylene and carbon monoxide. Hydroquinone occurs naturally as a glucose ether, also known as arbutin, in the leaves of many plants and in fruits, as well as one of the agents used in the defense mechanism of the bombardier beetle, family Carabidae.

Chemische Eigenschaften

white needle-like crystals or crystalline powder

Chemische Eigenschaften

Hydroquinone, a colorless, hexagonal prism, has been reported to be a good antimitotic and tumor-inhibiting agent. It is a reducing agent used in a photographic developer, which polymerizes in the presence of oxidizing agents. In the manufacturing industry it may occur include bacteriostatic agent, drug, fur processing, motor fuel, paint, organic chemicals, plastics, stone coating, and styrene monomers.

Physikalische Eigenschaften

Colorless to pale brown, odorless, hexagonal crystals

Originator

Quinnone,Dermohr,US,1980

Verwenden

hydroquinone is a pigment-lightening agent used in bleaching creams. Hydroquinone combines with oxygen very rapidly and becomes brown when exposed to air. Although it occurs naturally, the synthetic version is the one commonly used in cosmetics. Application to the skin may cause allergic reaction and increase skin sun sensitivity. Hydroquinone is potentially carcinogenic and is associated with causing ochronosis, a discoloration of the skin. The u.S. FDA has banned hydroquinone from oTC cosmetic formulations, but allows 4 percent in prescription products. Its use in cosmetics is prohibited in some european countries and in Australia.

Verwenden

K channel agonist, antihypertensive

Verwenden

reducing agent prevents polymerization of resin monomers lightens darkened skin, light sensitive

Verwenden

Photographic reducer and developer; antioxidant; stabilizing agent for some polymers; intermediate in the manufacturing of some dyes and pigments; in cosmetic formulations.

Verwenden

Use as photographic reducer and developer; as reagent in the determination of small quantities of phosphate; as antioxidant. Depigmentor

Definition

ChEBI: A benzenediol comprising benzene core carrying two hydroxy substituents para to each other.

Indications

Hydroquinone interferes with the production of the pigment melanin by epidermal melanocytes through at least two mechanisms: it competitively inhibits tyrosinase, one of the principal enzymes responsible for converting tyrosine to melanin, and it selectively damages melanocytes and melanosomes (the organelles within which melanin is stored).

Vorbereitung Methode

There are three current manufacturing processes for HQ: oxidative cleavage of diisopropylbenzene, oxidation of aniline, and hydroxylation of phenol.
Diisopropylbenzene is air oxidized to the intermediate diisopropylbenzene bishydroperoxide. This hydroperoxide is purified by extraction and reacted further to form hydroquinone. The purified product is isolated by filtration and packaged. The process can be almost entirely closed, continuous, computer-controlled, and monitored.
HQcan also be prepared by oxidizing aniline to quinone in the presence of manganese dioxide and sulfuric acid. p-Benzoquinone is then reduced to HQ using iron oxide. The resulting hydroquinone is crystallized and dried. The process occurs in a closed system.
HQis also manufactured by hydroxylation of phenol using hydrogen peroxide as a hydroxylation agent. The reaction is catalyzed by strong mineral acids or ferrous or cobalt salts.

Manufacturing Process

Into a pressure reactor there was charged 100 ml of methanol and 1 g of diruthenium nonacarbonyl. The reactor was closed, cooled in solid carbon dioxide/acetone, and evacuated. Acetylene, to the extent of 1 mol (26 g), was metered into the cold reactor. Carbon monoxide was then pressured into this vessel at 835-980 atmospheres, during a period of 16.5 hours; while the reactor was maintained at 100°C to 150°C. The reactor was then cooled to room temperature and opened.
The reaction mixture was removed from the vessel and distilled at a pressure of 30-60 mm, and a bath temperature of 30°C to 50°C until the methanol had all been removed. The extremely viscous tarry residue remaining in the still pot was given a very crude distillation, the distillate boiling at 82°C to 132°C/2 mm. In an attempt to purify this distillate by a more careful distillation, 5.3 g of a liquid distilling from 53°C to 150°C/5 mm was collected. At this point, much solid sublimate was noted not only in this distillate but in the condenser of the still. 7 g of the solid sublimate was scraped out of the condenser of the still. Recrystallization of the sublimate from ethyl acetate containing a small amount of petroleum ether gave beautiful crystals melting at 175°C to 177°C (5 g). Infrared analysis confirmed that this compound was hydroquinone (9% conversion).

Trademarks

Aida;Ambi- skin tone;Black and white;Creme des 3 fleur d'orient;Eldopaque forte;Eldoquin forte 4% cream;Epocler;Esoterica facial;Esoterica regular;Esoterica sensitive skin;Esoterica sunscreen;Melanex topical sollution;Melpaque hp;Melqui hp;Neostrata aha gel;Neostrata hq;Nuquin hp;Pigmanorm;Porcelana;Sinquin;Solaquin forte sun bleaching;Superfade age spot;Ultraquin plaine.

Therapeutic Function

Depigmentor

Weltgesundheitsorganisation (WHO)

Hydroquinone was introduced in 1965 as a topical depigmenting agent for hyperpigmentation. At high concentrations hydroquinone is corrosive and in most countries has been restricted to the level of approximately 2% and limited to the period of less than 2 months. Additional consideration for restrictive action is that animal experiments have also demonstrated carcinogenic and mutagenic potential of hydroquinone.

Synthesis Reference(s)

Chemistry Letters, 14, p. 731, 1985
The Journal of Organic Chemistry, 50, p. 1722, 1985
Tetrahedron Letters, 22, p. 2337, 1981 DOI: 10.1016/S0040-4039(01)82900-2

Allgemeine Beschreibung

Light colored crystals or solutions. May irritate the skin, eyes and mucous membranes. Mildly toxic by ingestion or skin absorption.

Air & Water Reaktionen

Darkens on exposure to air and light. Miscible in water. Solutions become brown in air due to oxidation. Oxidation is very rapid in the presence of alkali.

Reaktivität anzeigen

Hydroquinone is a slight explosion hazard when exposed to heat. Incompatible with strong oxidizing agents. Also incompatible with bases. Hydroquinone reacts with oxygen and sodium hydroxide. Reacts with ferric salts . Hot and/or concentrated NaOH can cause Hydroquinone to decompose exothermically at elevated temperature. (NFPA Pub. 491M, 1975, 385)

Hazard

Toxic by ingestion and inhalation, irritant. Questionable carcinogen.

Health Hazard

Exposures to hydroquinone in large quantities by accidental oral ingestion produce toxicity and poisoning. The symptoms of poisoning include, but are not limited to, blurred speech, tinnitus, tremors, sense of suffocation, vomiting, muscular twitching, headache, convul- sions, dyspnea and cyanosis from methemoglobinemia, coma, and collapse from respira- tory failure. Occupational workers should be allowed to work with protective clothing and dust masks with full-face or goggles to protect the eyes, and under proper management.

Health Hazard

Hydroquinone is very toxic; the probable oral lethal dose for humans is 50-500 mg/kg, or between 1 teaspoon and 1 ounce for a 150 lb. person. It is irritating but not corrosive. Fatal human doses have ranged from 5-12 grams, but 300-500 mg have been ingested daily for 3-5 months without ill effects. Death is apparently initiated by respiratory failure or anoxia.

Brandgefahr

Dust cloud may explode if ignited in an enclosed area. Hydroquinone can react with oxidizing materials and is rapidly oxidized in the presence of alkaline materials. Oxidizes in air.

Kontakt-Allergie

Hydroquinone is used in photography developers (black and white, X-ray, and microfilms), in plastics, in hair dyes as an antioxidant and hair colorant. Hydroquinone is found in many skin bleaching creams.

Clinical Use

Hydroquinone is applied topically to treat disorders characterized by excessive melanin in the epidermis, such as melasma. In the United States, nonprescription skin-lightening products contain hydroquinone at concentrations of 2% or less; higher concentrations are available by prescription.

Nebenwirkungen

The incidence of adverse effects with hydroquinone increases in proportion to its concentration. A relatively common side effect is local irritation, which may actually exacerbate the discoloration of the skin being treated. Allergic contact dermatitis occurs less commonly. A rare but more serious complication is exogenous ochronosis, in which a yellow-brown pigment deposited in the dermis results in blue-black pigmentation of the skin that may be permanent.

Carcinogenicity

No case reports of cancer associated with HQ exposure have been published.

Source

Hydroquinone occurs naturally in strawberry tree leaves, pears, blackberries, Chinese alpenrose, bilberries, blackberries, hyacinth flowers, anise, cowberries, and lingonberries (Duke, 1992).

Environmental Fate

Biological. In activated sludge, 7.5% mineralized to carbon dioxide after 5 d (Freitag et al., 1985). Under methanogenic conditions, inocula from a municipal sewage treatment plant digester degraded hydroquinone to phenol prior to being mineralized to carbon dioxide and methane (Young and Rivera, 1985). In various pure cultures, hydroquinone degraded to the following intermediates: benzoquinone, 2-hydroxy-1,4-benzoquinone, and β-ketoadipic acid. Hydroquinone also degraded in activated sludge but no products were identified (Harbison and Belly, 1982). Heukelekian and Rand (1955) reported a 5-d BOD value of 0.74 g/g which is 39.2% of the ThOD value of 1.89 g/g. In activated sludge inoculum, following a 20-d adaptation period, 90.0% COD removal was achieved. The average rate of biodegradation was 54.2 mg COD/g?h (Pitter, 1976).
Photolytic. A carbon dioxide yield of 53.7% was achieved when hydroquinone adsorbed on silica gel was irradiated with light (λ >290 nm) for 17 h (Freitag et al., 1985). Chemical/Physical. Ozonolysis products reported are p-quinone and dibasic acids (Verschueren, 1983). Moussavi (1979) studied the autoxidation of hydroquinone in slightly alkaline (pH 7 to 9) aqueous solutions at room temperature. The oxidation of hydroquinone by oxygen followed first-order kinetics that yielded hydrogen peroxide and p-quinone as products. At pH values of 7.0, 8.0, and 9.0, the calculated half-lives of this reaction were 111, 41, and 0.84 h, respectively (Moussavi, 1979).
Chlorine dioxide reacted with hydroquinone in an aqueous solution forming p-benzoquinone (Wajon et al., 1982). Kanno et al. (1982) studied the aqueous reaction of hydroquinone and other substituted aromatic hydrocarbons (aniline, toluidine, 1- and 2-naphthylamine, phenol, cresol, pyrocatechol, resorcinol, and 1-naphthol) with hypochlorous acid in the presence of ammonium ion. They reported that the aromatic ring was not chlorinated as expected but was cleaved by chloramine forming cyanogen chloride. As the pH was lowered, the amount of cyanogen chloride formed increased (Kanno et al., 1982).
At influent concentrations of 1.0, 0.1, 0.01, and 0.001 mg/L, the GAC adsorption capacities were 160, 90, 51, and 29 mg/g, respectively (Dobbs and Cohen, 1980).

läuterung methode

Crystallise quinol from acetone, *benzene, EtOH, EtOH/*benzene, water or acetonitrile (25g in 30mL), preferably under nitrogen. Dry it under vacuum. [Wolfenden et al. J Am Chem Soc 109 463 1987, Beilstein 6 H 836, 6 IV 5712.]

Toxicity evaluation

Benzene, phenol, and hydroquinone are metabolized in vivo to benzoquinone and excreted as the mercapturate, N-acetyl-S- (2,5-dihydroxyphenyl)-L-cysteine. Hydroquinone is a reducing cosubstrate for peroxidase enzymes, and the resultant semiquinone and p-benzoquinone may bind to DNA.

1,4-Dihydroxybenzol Upstream-Materialien And Downstream Produkte

Upstream-Materialien

Downstream Produkte


1,4-Dihydroxybenzol Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

Global( 609)Lieferanten
Firmenname Telefon Fax E-Mail Land Produktkatalog Edge Rate
Hefei TNJ Chemical Industry Co.,Ltd.
+86-0551-65418679
86-0551-65418697 info@tnjchem.com China 3000 55
Henan Xiangtong Chemical Co., Ltd.
86-371-61312303
86-371-86017988 cathy@hnxtchem.com CHINA 293 58
Hebei Guanlang Biotechnology Co., Ltd.
+8619930503282
alice@crovellbio.com China 5942 58
Hebei Mojin Biotechnology Co., Ltd
0086 15533627333
admin@hbmojin.com CHINA 1011 58
Xi'an ZB Biotech Co.,Ltd
+8618591943808
sales01@xazbbio.com CHINA 1596 58
Shandong Natural Micron Pharm Tech Co.,LTD
13752232623
info@nmpharmtech.com CHINA 2736 58
Shanghai Dumi Biotechnology Co.,ltd
17172178855 +8617172178855
aimee@chinadumi.com CHINA 241 58
Shanghai UCHEM Inc.
15502138767 15502138767
sales@myuchem.com CHINA 3027 58
BAODING STORD IMPORT AND EXPORT CO.,LTD
+8618603329229
+86-0312-8410000 luis.manager113@foxmail.com China 291 58
Henan DaKen Chemical CO.,LTD.
+86-371-66670886
info@dakenchem.com China 15421 58

123-31-9(1,4-Dihydroxybenzol)Verwandte Suche:


  • Hydroquinone, 99.5%, 99.5%
  • HYDROXYQUINOL
  • HYDROCHINONE
  • HYDROQUINONE
  • AKOS BBS-00004220
  • hydroquinone--1,4-benzenediol
  • Idrochinone
  • Melanex
  • NCI-C55834
  • para-dihydroxybenzene
  • paradioxybenzene
  • para-dioxybenzene
  • para-hydroquinone
  • p-Benzenediol
  • p-dihydroxy-benzen
  • p-Dioxobenzene
  • Phiaquin
  • p-Hydroxybenzene
  • p-Hydroxyphenol
  • p-quinol
  • pyrogentisticacid
  • Solaquin forte
  • Tecquinol
  • Tecquinol tech. grade
  • Tenox HQ
  • tenoxhq
  • Tequinol
  • USAF ek-356
  • usafek-356
  • Hydrochinone 0
  • 1,4-BENZENEDIOL
  • 1,4-DIHYDROXYBENZENE
  • Hydroxyquinone
  • HYDROQUINONE MONOMETHYL
  • HYDROQUINON
  • p-Djbydroxybenzene
  • P-DIOXYBENZENE
  • P-DIHYDROXYBENZENE
  • p-Hydroquinone
  • QUINOL
  • PYROGENTISIC ACID
  • Hydroquinone 1,4-dihydroxybenzene
  • HYDROQUINONE REAGENTPLUS(TM) 99%
  • Hydroquinone, 99% 500GR
  • Hydroquinone, 99.5% 50GR
  • 1,4-Dihydroxybenzene Quinol
  • Hydroquinone solution
  • HYDROQUINONE USP(P)
  • p-Benzediel
  • Butylhydroxyanisole EP IMpurity A
  • HYDROQUINONE(P)
  • 1,4-Benzenediol (hydroquinone)
  • 1,4-Dihydroxy-benzeen
  • 1,4-Dihydroxybenzen
  • 1,4-dihydroxybenzen(czech)
  • 1,4-Dihydroxy-benzol
  • 1,4-Diidrobenzene
  • 4-Hydroxyphenol
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