1-Butyl-3-methylimidazolium bisulfate CAS 262297-13-2

1. Description

1-Butyl-3-methylimidazolium bisulfate (CAS 262297-13-2) is an acidic ionic liquid utilized primarily in pharmaceutical synthesis and processing. Belonging to the imidazolium ionic liquid class, its key benefit lies in the Brønsted acidity conferred by the bisulfate ( $H S O_{4 -}$ ) anion, making it an effective and potentially reusable catalyst for various organic reactions. It serves as a valuable tool for developing efficient synthetic pathways for APIs and intermediates under controlled acidic conditions.

2. Properties Table

Property Value

Chemical Name 1-Butyl-3-methylimidazolium bisulfate (or hydrogen sulfate)

Abbreviation BMIM-HSO4; [BMIM][HSO4]

CAS Number 262297-13-2

Molecular Formula $C_{8} H_{16} N_{2} O_{4} S$

Molecular Weight $236.29 g / m o l$

Appearance Colorless to pale yellow viscous liquid

Purity $> 98.0%$

Acidity Acidic (Brønsted acid)

Melting Point < $25 ° C$

Density Approx. $1.25 g / c m^{3}$

Solubility Miscible with water; soluble in polar organic solvents

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