4-Bromo-1-ethyl-1H-pyrazole

Name: 4-Bromo-1-ethyl-1H-pyrazole
Brand: ChemScene
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CAS No. 71229-85-1
Cat. No. CS-W003481
Purity≥97%
MDL No.MFCD08235252

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Type	HazMat Fee
Excepted Quantity	$0.00
FedEx Limited Quantities Ground	$0.00
Hazmat Ground shipping	$50.00+
Inaccessible (Haz class 6.1 or 9), Domestic	$68.00+
Accessible (Haz class 3, 4, 5 or 8), Domestic	$158.00+
Inaccessible (Haz class 6.1 or 9), International	$108.00+
Accessible (Haz class 3, 4, 5 or 8), International	$238.00+

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Structure of 71229-85-1

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Description

4-Bromo-1-ethyl-1H-pyrazole is a bench-stable, moisture-tolerant heterocyclic building block featuring a bromine substituent at the 4-position and an ethyl group at the 1-position of the pyrazole core. This configuration enables direct functionalization in cross-coupling reactions, facilitating access to diverse pyrazole-based scaffolds for medicinal chemistry and materials science applications.

Application

4-Bromo-1-ethyl-1H-pyrazole serves as a versatile building block in medicinal chemistry, enabling palladium-catalyzed cross-coupling reactions due to its well-established bromine reactivity. The ethyl group at the 1-position enhances solubility and stability, while the pyrazole core provides a robust heterocyclic scaffold with favorable pharmacophore properties. This compound facilitates efficient synthesis of substituted pyrazoles under standard coupling conditions, offering reliable functional group tolerance and straightforward purification—ideal for high-throughput screening and lead optimization workflows.

General Information

CAS No. 71229-85-1
Cat. No. CS-W003481
Purity ≥97%
MDL No. MFCD08235252
Storage 4°C
Shipping Room temperature in continental US; may vary elsewhere.
Molecular Formula C₅H₇BrN₂
Molecular Weight 175.03
Synonym(s) None
SMILES CCN1C=C(Br)C=N1

Computational Chemistry Data

TPSA 17.82
LogP 1.6655
H_Acceptors 2
H_Donors 0
Rotatable_Bonds 1

Safety Information

Download SDS

GHS Pictogram :	GHS No : GHS07
Signal Word : Warning	UN#: N/A
Class : N/A	Packing Group : N/A
Hazard Statements : H302-H315-H319-H335
Precautionary Statements : P261-P264-P270-P271-P280-P302+P352-P304+P340-P305+P351+P338-P330-P362+P364-P403+P233-P405-P501

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Other Classifications

Building Blocks Skeleton Aromatic heterocycle compounds Pyrazole compounds

Key Words

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4-Bromo-1-ethyl-1H-pyrazole

CAS No. 71229-85-1

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