2,4-DIHYDROXYBENZALDEHYDE

PRODUCT IDENTIFICATION

CAS NO. 95-01-2

2,4-DIHYDROXYBENZALDEHYDE

EINECS NO. 202-383-1
FORMULA (HO)2C6H3CHO
MOL WT. 138.12
H.S. CODE  
TOXICITY  
SYNONYMS beta-Resorcylaldehyde; beta-Resorcylic aldehyde;
4-hydroxy-Salicylaldehyde; 2,4-Dihydroxybenzenecarbonal; 4-Hydroxysalicylaldehyde; 4-Formylresorcinol; 4-Hydroxysalicyladehyde; 2,4-二羟基苯甲醛;
SMILES
 

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE

white crystal

MELTING POINT 135 - 137 C
BOILING POINT  
SPECIFIC GRAVITY  
SOLUBILITY IN WATER freely soluble
AUTOIGNITION  
pH  
VAPOR DENSITY  
NFPA RATINGS  

REFRACTIVE INDEX

 
FLASH POINT

 

STABILITY Stable under ordinary conditions. moisture sensitive

GENERAL DESCRIPTION & APPLICATIONS

Benzaldehyde(also called Benzenecarbonal) is the simplest representative of the aromatic aldehydes. It is a colorless liquid aldehyde with a characteristic almond odor. It boils at 180°C, is soluble in ethanol, but is insoluble in water. Benzaldehyde is formed by partial oxidation of benzyl alcohol and readily oxidized to benzoic acid and is converted to addition products by hydrocyanic acid or sodium bisulfite. It is also prepared by oxidation of toluene or benzyl chloride or by treating benzal chloride with an alkali, e.g., sodium hydroxide. It is used chiefly in the synthesis of other organic compounds, ranging from pharmaceuticals to plastic additives and benzaldehyde is an important intermediate for the processing of perfume and flavouring compounds and in the preparation of certain aniline dyes . It is the first step in the synthesis for fragrances. It undergoes simultaneous oxidation and reduction with alcoholic potassium hydroxide, giving potassium benzoate and benzyl alcohol. It is converted to benzoin with alcoholic potassium cyanide, with anhydrous sodium acetate and acetic anhydride, giving cinnamic acid. Compounds which do not have alpha-hydrogen atoms cannot form an enolate ion and do not undergo electrophilic alpha-substitution and aldol condensation. Aromatic aldehydes such as benzaldehyde and formaldehyde may undergo disproportionation in concentrated alkali (Cannizaro's reaction); one molecule of the aldehyde is reduced to the corresponding alcohol and another molecule is simultaneously oxidized to the salt of a carboxylic acid. The speed of the reaction depends on the substituents in the aromatic ring. Two different types of aldehydes (aromatic and aliphatic) can undergo crossing reaction to form fomaldehyde and aromatic alcohols. 2,4-Dihydroxybenzaldehyde is used as an intermediate for the preparation of pharmaceuticals, perfumery, dyes and other organic chemicals
SALES SPECIFICATION

APPEARANCE

white needle crystal

CONTENT

98.0%

MELTING POINT 135 - 137 C
TRANSPORTATION
PACKING 25kgs in fiber drum
HAZARD CLASS  
UN NO.

 

OTHER INFORMATION
Hazard Symbols: XI, Risk Phrases: 36/37/38, Safety Phrases: 24/25