Tetrabutylphosphine bromide CAS 3115-68-2

Description

Tetrabutylphosphine bromide, CAS 3115-68-2, is a quaternary phosphonium salt. It consists of a central phosphorus atom bonded to four butyl groups (tetrabutylphosphonium cation, [P(C4​H9​)4​]+) and a bromide anion (Br−). This compound is typically a white to off-white crystalline solid. Tetrabutylphosphine bromide is utilized in organic synthesis as a phase transfer catalyst (PTC), facilitating reactions between reactants present in different immiscible phases (e.g., organic and aqueous). It can also serve as a source of the tetrabutylphosphonium cation, as a precursor for ligands in organometallic chemistry, or as a component in the preparation of some ionic liquids. Due to its chemical properties, it finds application in various chemical reactions and research settings. While the request mentions “pharmaceutical product,” its primary roles are as a chemical reagent and catalyst rather than a direct therapeutic agent, though it could be used in the synthesis of pharmaceutical intermediates.

Properties

Property	Value
CAS Number	3115-68-2
Chemical Name	Tetrabutylphosphonium bromide; Tetrabutylphosphanium bromide
Common Acronym	TBPSBr; TBPB
Molecular Formula	C16​H36​PBr
Molecular Weight	339.33 g/mol
Appearance	White to off-white crystalline powder or solid
Melting Point	Approximately 100−104∘C (can vary with purity)
Solubility	Soluble in water, ethanol, methanol, dichloromethane, chloroform; sparingly soluble in less polar organic solvents like diethyl ether and hydrocarbons.
Stability	Generally stable under normal storage conditions; hygroscopic, should be stored in a dry place.
Purity/Grades	Typically available in reagent grade or high purity (e.g., >98%, >99%).

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