3-Bromo-1,5-dimethylpyrazole

Base Information

• Chemical Name: 3-Bromo-1,5-dimethylpyrazole
• CAS No.: 5744-80-9
• Molecular Formula: C5H7 Br N2
• Molecular Weight: 175.028
• Hs Code.: 32129000
• Mol file: 5744-80-9.mol

Synonyms:Pyrazole,3-bromo-1,5-dimethyl- (7CI,8CI)

Chemical Property of 3-Bromo-1,5-dimethylpyrazole

Chemical Property:

• Vapor Pressure: 0.261mmHg at 25°C
• Boiling Point: 212 ºC
• PKA: 0.31±0.10(Predicted)
• Flash Point: 82 ºC
• PSA: 17.82000
• Density: 1.58
• LogP: 1.49100
• Storage Temp.: under inert gas (nitrogen or Argon) at 2-8°C

Purity/Quality:

99% ^*data from raw suppliers

3-Bromo-1,5-dimethyl-1H-pyrazole ^*data from reagent suppliers

Safty Information:

• Statements: 36/37/38
• Safety Statements: 26-36/37/39

MSDS Files:

SDS file from LookChem

Useful:

Technology Process of 3-Bromo-1,5-dimethylpyrazole

There total 2 articles about 3-Bromo-1,5-dimethylpyrazole which guide to synthetic route it. The literature collected by LookChem mainly comes from the sharing of users and the free literature resources found by Internet computing technology. We keep the original model of the professional version of literature to make it easier and faster for users to retrieve and use. At the same time, we analyze and calculate the most feasible synthesis route with the highest yield for your reference as below:

synthetic route:

Reference yield: 58.0%

3-bromo-1,5-dimethyl-4,5-dihydro-1H-pyrazole → 3-bromo-5-methyl-1H-pyrazole (57097-81-1) + 3-bromo-1,5-dimethyl-1H-pyrazole (5744-80-9)

Guidance literature:

With sodium hypochlorite; potassium phosphate; potassium bromide; In dichloromethane; water; at 0 - 5 ℃; Inert atmosphere;

DOI:10.1021/acs.joc.7b03282

Reference yield:

1,5-dimethylpyrazolidin-3-one hydrobromide → 3-bromo-5-methyl-1H-pyrazole (57097-81-1) + 3-bromo-1,5-dimethyl-1H-pyrazole (5744-80-9)

Guidance literature:

Multi-step reaction with 2 steps

1.1: tetraethylammonium bromide; triethylamine / dichloromethane / 20 - 35 °C / Inert atmosphere

1.2: 5 h / 0 - 30 °C / Inert atmosphere

1.3: 0.5 h / 20 - 25 °C / Inert atmosphere

2.1: potassium bromide; potassium phosphate; sodium hypochlorite / water; dichloromethane / 0 - 5 °C / Inert atmosphere

With sodium hypochlorite; potassium phosphate; tetraethylammonium bromide; triethylamine; potassium bromide; In dichloromethane; water;

DOI:10.1021/acs.joc.7b03282

Reference yield: 48.0%

(3-formyl-2-methoxyphenyl)boronic acid (480424-49-5) + 3-bromo-1,5-dimethyl-1H-pyrazole (5744-80-9) → 3-(1,5-dimethyl-1H-pyrazol-3-yl)-2-methoxybenzaldehyde

Guidance literature:

With (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; potassium phosphate; water; In 1,4-dioxane; at 80 ℃; for 15h;

Refernces