Dibenzoylmethane CAS# 120-46-7

Dibenzoylmethane, Promotion Season Now in Store and Free Sample for Testing with Factory Price
  • Appearance: White crystal powder.
  • Assay: 99. 0%min.
  • Packaging: 25kg/ Kraft bag.
  • Sample: Available

Quality Control of Dibenzoylmethane

Chemical Structure
Packing of Dibenzoylmethane

Description of Dibenzoylmethane

1,3-Diphenyl-1,3-propanedione (dibenzoylmethane, DBM) is an aromatic 1,3-diketone derivative of acetylacetone (acac), where both methyl groups in acac have been substituted by phenyl groups. It is a white solid melting at 77−78°C. Similar to acac, DBM exists in two tautomeric forms, with the keto-enol equilibrium of DBM shifting strongly towards the enol form, particularly in non-polar solvents such as benzene. This is the result of the stability of the intramolecular hydrogen bond in the cis-enol form which is further resonance-stabilized by conjugation with phenyl rings. Due to its high photostability, derivatives of DBM such as avobenzone, have found applications as sunscreen products.

Basic Info of Dibenzoylmethane

Basic Info

Chemical Name

dibenzoylmethane

Synonyms

1,3-Diphenyl-1,3-propanedione;1,3-Propanedione, 1,3-diphenyl-;1,3-Diphenylpropane-1,3-dione;Dibenzoylmethane;

CAS No.

120-46-7

Molecular Formula

C15H12O2

Molecular Weight

224.25500

PSA

34.14000

LogP

3.14230

 

Safety Info

RTECS

TZ1930000

Safety Statements

S24/25

HS Code

2914399090

WGK Germany

3

Risk Statements

R36/37/38

Hazard Codes

Xi

 

Properties

Appearance & Physical State

yellowish-white powder

Boiling Point

219-221ºC (18 mmHg)

Melting Point

75-79ºC

Flash Point

146.9ºC

Refractive Index

1.623

Stability

Stable. Incompatible with strong oxidizing agents.

Storage Condition

Store at RT.

Vapor Pressure

1.63E-06mmHg at 25°C

 

Numbering system

EINECS number

204-398-9

MDL number

MFCD00003085

RTECS number

TZ1930000

BRN number

514910

PubChem number

24893746

 

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What is Dibenzoylmethane?

With the progress of science and technology and the development of society, chemical products have invariably permeated our daily lives, in medicine, food, cosmetics, electronics, industry, and other areas, becoming an essential part of our lives. One such product is Dibenzoylmethane which has developed particularly rapidly in recent years. Do you know about Dibenzoylmethane?

 

The official answer: Dibenzoylmethane is a chemical substance, Dibenzoylmethane, the molecular formula is C15H12O2, molecular weight is 224.25. colorless rhomboidal crystals, easily soluble in chlorohydrin, chloroform, soluble in sodium hydroxide solution, insoluble in sodium carbonate solution, very slightly soluble in water. Used as co-stabilizer of calcium/zinc hydroxylate stabilization system, used to manufacture PVC mineral water bottles. Analytical reagents for the determination of carbon disulfide and thallium.

What’s the application of Dibenzoylmethane?

The original industrial production process is: using solid sodium methanol as the catalyst, acetophenone, and methyl benzoate under xylene as the solvent for the Claisen condensation reaction to obtain dibenzoylmethane. Because the solid sodium methanol powder is flammable and explosive, it is easy to decompose when it meets water, so the solvent must be dehydrated before adding, and then the solid sodium methanol must be added under nitrogen protection after cooling down to 35°C. The reaction process must be protected by nitrogen, so there are great safety hazards and large power consumption. The molar ratio of industrial production is acetophenone: methyl benzoate: solid sodium methanol = 1:1.2:1.29. The average primary yield of the product is 80%, and the overall yield of the mother liquor is 85.5% after recovery.

The production process of Xinda is as follows: add 3000L of xylene solvent to the reactor, add 215Kg of solid sodium hydroxide, turn on the stirring, raise the temperature to 133℃, evaporate the low fraction water; then add 765Kg of methyl benzoate, continue to raise the temperature to 137℃, start to add 500Kg of acetophenone dropwise, four hours dropwise, keep the reaction temperature at 137-139℃, with the dropwise addition of acetophenone, the material solution gradually becomes thicker. The reaction process removes the by-product methanol, which makes the reaction proceed in the positive direction and evaporates the mixed solvent of methanol and xylene. After the titration is finished, hold the reaction for 2 hours. When there is basically no distillate, the reaction is finished.

Comparison between the new process and the original process: solvent dosage is reduced by 500L, solvent consumption is reduced by 5%; the process of solvent heating and negative pressure dehydration is eliminated, and the process of cooling and cooling is eliminated; sodium hydroxide is used instead of solid sodium methanol as a catalyst, and nitrogen protection is eliminated; the processing time for this step of condensation reaction is reduced by 3 hours per batch; the amount of mixed solvent is reduced by about 500L, and the amount of hydrochloric acid in acidification post is reduced by 300Kg per batch. methyl benzoate Each batch uses 85Kg more, and the extra methyl benzoate consumed can be recovered, with a recovery rate of 80% and a recovery cost of 500 RMB per ton. Use I】As co-stabilizer of calcium/zinc hydroxylate stabilization system, used to manufacture PVC mineral water bottles. Use II】Analytical reagent, check carbon disulfide and thallium, weight determination of uranium, photometric determination of U+4, extraction of silver, aluminum, barium, beryllium, calcium, cadmium, cobalt, copper, iron, gallium, mercury, captivity, lanthanum, magnesium, manganese, nickel, lead, palladium, scandium, thorium, titanium, zinc, zirconium, etc.

Conclusion

Sincere to the customer and in good faith of quality is our forever followed motto. It’s the basement to be a human and do business. We take all responsibility for our products and service sincerely. We are a company integrating R&D, production, and sales. The design, research, and development of pharmaceutical intermediates including more than 330 kinds of pharmaceutical intermediates such as Anti-infectives, Cardiovascular and Cerebrovascular Systems, Digestive System, Santi-tumor, Nervous System, Geriatric Drugs, and Gynecological Drugs. At the same time, we have more than 4,000 factories in strategic cooperation with nearly 50,000 chemical products, so we can provide you with a one-stop purchasing service, which greatly saves customers’ procurement costs and time.

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