Yancheng Sanhe Biochemical Co., Ltd.--1,4-dibromobenzene|106-37-6

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Sanhe Biochemical

1,4-dibromobenzene

Product name	1,4-dibromobenzene
English alias	p-Dibromo Benzene
Structural formula
Molecular formula	C₆H₄Br₂
Molecular weight	235.90400
Appearance	White to light yellow crystalline powder
Melting point	86-89 ℃
Relative density	1.84
Boiling point	219 ℃
Water solubility	Insoluble.
Refractivity	1.5742
Content	≥99.0%
Moisture	≤0.05%
Stability	Stable. Combustible. Incompatible with strong oxidizing agents.
Flash point	219-220℃
Vapor pressure	10 mm Hg ( 40 ℃)
Storage	Ventilation and low-temperature drying in the warehouse
Use	This product is used in organic synthesis and can also be used as a dye intermediate.
Production method	Add 2g of iron filings to 1mol of benzene and slowly add bromine dropwise. Generally, the reaction begins after 15 minutes (slow boiling), and the bromine addition rate is controlled to maintain a slight boiling of the reactants. After adding bromine, heat at 20-30 ℃ for 1 hour, then heat at 60 ℃ for 45 minutes until the brown vapor of bromine disappears. Filter out the iron filings, wash them with water, and then steam them. The brominated benzene distilled from the first part is removed from the water layer, dried with calcium chloride, and then distilled. The main fraction collected at 150-170 ℃ is brominated benzene. The residue after distillation is poured into a porcelain dish while hot, condensed, and combined with the p-dibromobenzene obtained from steam distillation. After drying, it is recrystallized with activated carbon and methanol to obtain 24g of p-dibromobenzene with a yield of 10%.
UN No.	UN 2711
Hazard class	9
Packing group	III
HS code	29036990
Packing	25KGS/cardboard drum
CAS #	106-37-6

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