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Chemical Name:
Hana;Henna;Mendi;Lawson;Mehendi;LAWSONE;CI 75480;LAWSONE(P);2-Hydroxy-1,4-;JAROCOL LAWSONE
Molecular Formula:
Formula Weight:
MOL File:

2-Hydroxy-1,4-naphoquinone Properties

Melting point:
192-195 °C (dec.)(lit.)
Boiling point:
265.11°C (rough estimate)
1.2346 (rough estimate)
refractive index 
1.5036 (estimate)
Crystalline Powder
Colour Index 
Water Solubility 
2 g/L (20 ºC)
Stable. Combustible. Incompatible with strong oxidizing agents.
CAS DataBase Reference
83-72-7(CAS DataBase Reference)
NIST Chemistry Reference
1,4-Naphthalenedione, 2-hydroxy-(83-72-7)
EPA Substance Registry System
1,4-Naphthalenedione, 2-hydroxy-(83-72-7)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  Xi,Xn
Risk Statements  36/37/38-68-36-22
Safety Statements  26-37/39-36/37/39-36
WGK Germany  3
RTECS  QL8200000
HS Code  29146990
Signal word: Warning
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501
H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
H341 Suspected of causing genetic defects Germ cell mutagenicity Category 2 Warning P201,P202, P281, P308+P313, P405,P501
Precautionary statements:
P201 Obtain special instructions before use.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P405 Store locked up.

2-Hydroxy-1,4-naphoquinone price More Price(8)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich H46805 2-Hydroxy-1,4-naphthoquinone 97% 83-72-7 10g $29.1 2018-11-20 Buy
Sigma-Aldrich H46805 2-Hydroxy-1,4-naphthoquinone 97% 83-72-7 25g $48.5 2018-11-20 Buy
TCI Chemical H0285 2-Hydroxy-1,4-naphthoquinone >98.0%(T) 83-72-7 25g $34 2018-11-22 Buy
TCI Chemical H0285 2-Hydroxy-1,4-naphthoquinone >98.0%(T) 83-72-7 100g $94 2018-11-22 Buy
Alfa Aesar A11880 2-Hydroxy-1,4-naphthoquinone, 98+% 83-72-7 10g $17.9 2018-11-13 Buy

2-Hydroxy-1,4-naphoquinone Chemical Properties,Uses,Production

Chemical Properties

Yellow crystal powder


antifungal, sunscreen, antibacterial, antineoplastic


An antimicrobial antioxidant dye isolated from Henna.


A coloring principle obtained from dried leaves of certain tropical plants (North Africa, India).

General Description

Yellow prisms or yellow powder.

Air & Water Reactions

Insoluble in water.

Reactivity Profile

Phenols, such as 2-Hydroxy-1,4-naphoquinone, do not behave as organic alcohols, as one might guess from the presence of a hydroxyl (-OH) group in their structure. Instead, they react as weak organic acids. Phenols and cresols are much weaker as acids than common carboxylic acids (phenol has Ka = 1.3 x 10^[-10]). These materials are incompatible with strong reducing substances such as hydrides, nitrides, alkali metals, and sulfides. Flammable gas (H2) is often generated, and the heat of the reaction may ignite the gas. Heat is also generated by the acid-base reaction between phenols and bases. Such heating may initiate polymerization of the organic compound. Phenols are sulfonated very readily (for example, by concentrated sulfuric acid at room temperature). The reactions generate heat. Phenols are also nitrated very rapidly, even by dilute nitric acid. Nitrated phenols often explode when heated. Many of them form metal salts that tend toward detonation by rather mild shock.

Health Hazard

ACUTE/CHRONIC HAZARDS: 2-Hydroxy-1,4-naphoquinone may be absorbed through the skin and can cause skin irritation.

Fire Hazard

Flash point data for 2-Hydroxy-1,4-naphoquinone are not available but 2-Hydroxy-1,4-naphoquinone is probably combustible.

Contact allergens

Henna, prepared by powdering the dried leaves of henna plant (Lawsonia inermis L.), is used for coloring and conditioning hair and nails, particularly by Muslims or Hindus. It contains Lawsone, which very rarely induces contact allergy. Most dermatitis caused by “black henna” is due to PPD and derivatives

Purification Methods

Crystallise Lawsone B from *C6H6 or AcOH (m 192.5o, 195-196o). It sublimes in a vacuum (m 194o). It has UV with max at 455nm (aqueous NaOH). [Beilstein 8 H 300, 8 I 635, 8 II 344, 8 III 2543, 8 IV 2360.]

2-Hydroxy-1,4-naphoquinone Preparation Products And Raw materials

Raw materials

Preparation Products

2-Hydroxy-1,4-naphoquinone Suppliers

Global( 170)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32764 55
Chengdu Biopurify Phytochemicals Ltd.
18080483897 CHINA 2200 58
career henan chemical co
+86-371-86658258 CHINA 20001 58
Shanghai Zheyan Biotech Co., Ltd.
18017610038 CHINA 3624 58
Shijiazhuang Moyi Chemical Technology Co., Ltd 0311-85511132 China 91 55
Jiangsu Mingchem Corporation 0519-85170101 85170202
0519-85170505 China 751 55
J & K SCIENTIFIC LTD. 400-666-7788 +86-10-82848833
+86-10-82849933; China 96815 76
Meryer (Shanghai) Chemical Technology Co., Ltd. +86-(0)21-61259100(Shanghai) +86-(0)755-86170099(ShenZhen) +86-(0)10-62670440(Beijing)
+86-(0)21-61259102(Shanghai) +86-(0)755-86170066(ShenZhen) +86-(0)10-88580358(Beijing) China 40399 62
3B Pharmachem (Wuhan) International Co.,Ltd. 86-21-50328103 * 801、802、803、804 Mobile:18930552037
86-21-50328109 China 15940 69
Alfa Aesar 400-610-6006; 021-67582000
021-67582001/03/05 China 30308 84

View Lastest Price from 2-Hydroxy-1,4-naphoquinone manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-12-20 2-Hydroxy-1,4-naphoquinone
US $2.00 / kg 1kg 99% ask career henan chemical co

2-Hydroxy-1,4-naphoquinone Spectrum

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