Triisobutylphosphine CAS 4125-25-1

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Triisobutylphosphine (TIBP) (CAS 4125-25-1) is a key tertiary alkylphosphine in synthetic and catalytic chemistry, prized for its high electron richness and significant steric bulk due to the branched *isobutyl* groups. It is a colorless to pale yellow liquid with a characteristic strong, pungent, garlic-like odor. TIBP is a highly effective ligand used in transition-metal catalysis, particularly for palladium-catalyzed cross-coupling reactions where its bulk helps facilitate the reductive elimination step, often allowing for challenging reactions to proceed efficiently at lower temperatures. It is also a powerful reducing agent.

Basic Information of TIBP

Meticulously produced and rigorously tested to meet stringent quality standards. We ensure exceptional purity and consistent performance, essential for your critical applications:

CAS No.:	4125-25-1
EC No.:	223-934-2
Linear Formula:	C12H27P
Molecular Weight:	202.32
Appearance:	Colorless to pale yellow, clear liquid
Odor:	Strong, highly pungent, garlic-like
Boiling Point:	126 °C50 mm Hg(lit.)
Density:	0.811 g/mL at 25 °C(lit.)
Solubility:	Insoluble in water; highly soluble in organic solvents (toluene, hexane, THF).
Flash Point:	50 °F
RIDADR:	UN 2845 4.2/PG 1
Chemical Structure:

Application Overview

TIBP is highly valued in demanding synthetic applications where its combination of strong electron donation and high steric bulk offers unique advantages over less hindered phosphines:

• Palladium-Catalyzed Cross-Couplings: TIBP is widely used as a ligand in reactions such as Suzuki, Negishi, and Buchwald-Hartwig couplings. Its steric bulk often accelerates the final, rate-determining reductive elimination step, which is crucial for achieving high yields, especially with challenging substrates.

• Pharmaceutical Synthesis: Employed in the efficient construction of carbon-carbon and carbon-nitrogen bonds in complex pharmaceutical intermediates and APIs (Active Pharmaceutical Ingredients), optimizing reaction conditions for scale-up.

• Selective Reduction: It acts as a selective reducing agent, capable of reducing specific functional groups without affecting others, a common requirement in multi-step organic synthesis.

• Polymer and Material Science: Used as a catalyst component in certain polymerization and coupling reactions to control the stereochemistry and molecular weight of specialized materials.

Why Choose Aure Chemical for Triisobutylphosphine?

Aure Chemical offers TIBP (CAS 4125-25-1) with specialized quality assurance protocols focused on preserving its reactivity, purity, and safe handling for advanced synthetic chemistry.

• Guaranteed Low Phosphine Oxide (TBPO): The primary inhibitor in catalysis is the oxidized form, Triisobutylphosphine Oxide (TBPO). We guarantee a maximum TBPO content below 0.1%, ensuring the highest possible catalytic turnover number (TON) and minimizing ligand loading required in your reaction.

• Rigorous Inert Atmosphere Handling: Due to TIBP's extreme sensitivity to atmospheric oxygen and moisture, we utilize high-integrity, double-sealed packaging handled exclusively under a high-purity argon atmosphere. This ensures the TIBP delivered is in its fully active, reduced state.

• Advanced Purity Verification: Every batch is confirmed via $\text{}^{31}\text{P NMR}$ spectroscopy. This dedicated analysis provides a definitive, highly sensitive measure of phosphine content and the absence of degradation products, offering synthetic chemists complete confidence in reactivity.

• Safe and Compliant Logistics: We manage the complex regulatory requirements (UN 2920, Flammable and Corrosive) for this material. Our specialized logistics ensure safe, fully compliant, and temperature-controlled delivery directly to your secure research or manufacturing site.

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Hazards Classification

• GHS Classification: Pyr. Liq. 1 (GHS02), Flam. Liq. 2 (GHS02), Acute Tox. 4 (Oral) (GHS06), Acute Tox. 4 (Dermal) (GHS06), Skin Corr. 1B (GHS05), Eye Dam. 1 (GHS05), Aquatic Acute 1 (GHS09), Aquatic Chronic 1 (GHS09)

• Hazard Statements: Catches fire spontaneously if exposed to air; Highly flammable liquid and vapour; Harmful if swallowed; Harmful in contact with skin; Causes severe skin burns and eye damage; Very toxic to aquatic life with long lasting effects

• UN Number: UN 2845

• Hazard Class: 4.2 (Spontaneously combustible)

• Packing Group: I