5932-19-4 | 3,4-Dibromo-5-methyl-1h-pyrazole

Packsize	Purity	Availability	Price	Discounted Price
250mg	97%	2 weeks	$235.00	$164.00
1g	97%	2 weeks	$564.00	$395.00
5g	>95%	2 weeks	$1,620.00	$1,134.00
10g	>95%	2 weeks	$2,215.00	$1,550.00
25g	>95%	2 weeks	$3,901.00	$2,731.00

Description

• Catalog Number: AG91178
• Chemical Name: 3,4-Dibromo-5-methyl-1h-pyrazole
• CAS Number: 5932-19-4
• Molecular Formula: C4H4Br2N2
• Molecular Weight: 239.8960
• MDL Number: MFCD00159652
• SMILES: Brc1n[nH]c(c1Br)C

Upstream Synthesis Route

To synthesize 3,4-Dibromo-5-methyl-1H-pyrazole, one could start from a suitable diketone precursor, such as 3-methyl-1,4-diketone, also known as acetylacetone where the methyl group is located on the middle carbon of the three-carbon diketone chain.

1. **Formation of Pyrazole Ring**: The synthesis begins with the reaction of 3-methyl-1,4-diketone with hydrazine (NH₂NH₂), which leads to the formation of a pyrazole ring. The methyl group at the 3-position on the diketone will correspond to the 5-methyl group on the final pyrazole product. The hydrazine attacks one of the ketone groups, leading to the condensation and formation of the pyrazole ring.

2. **Bromination**: Once the pyrazole ring is formed, the next step involves the bromination of the ring at the 3 and 4 positions. This can be achieved through a halogenation reaction using bromine (Br₂) in an appropriate solvent such as acetic acid, chloroform, or carbon tetrachloride, along with a catalytic amount of a Lewis acid like iron(III) bromide (FeBr₃) for regioselective bromination. The reaction conditions need to be carefully controlled to ensure that only the desired positions on the ring are brominated.

3. **Purification**: Following the bromination, the resulting 3,4-dibromo-5-methyl-1H-pyrazole may need to be purified to remove any unreacted starting material or by-products. Typical purification methods might include recrystallization from a suitable solvent or chromatographic techniques.

It's critical throughout the process to monitor the reaction conditions, such as temperature, stoichiometry, and time, to ensure high yield and selectivity for the desired product.