Overview
Ethyl Di-tert-butylphosphine (EDtBP) is a tertiary phosphine ligand widely employed in homogeneous catalysis due to its steric bulk and strong electron-donating properties. Developed as an alternative to bulkier phosphines like P(t-Bu)3, it balances reactivity and stability in transition metal-catalyzed reactions. As an organophosphorus compound, EDtBP is particularly valued in cross-coupling reactions (e.g., Suzuki-Miyaura, Heck reactions) where it enhances catalytic efficiency. Its synthesis typically involves nucleophilic substitution between ethylphosphine derivatives and tert-butyl halides under controlled conditions.
Physical and Chemical Properties
EDtBP is a colorless to pale yellow liquid at room temperature, with a molecular weight of 174.27 g/mol. Its density is approximately 0.82 g/cm³, and it exhibits high solubility in common organic solvents such as toluene, tetrahydrofuran (THF), and dichloromethane. The compound is air-sensitive, requiring handling under inert atmospheres (e.g., nitrogen or argon) to prevent oxidation. As a strong σ-donor ligand, it forms stable complexes with late transition metals (e.g., Pd, Pt), influencing reaction kinetics and selectivity in catalytic cycles.
Main Applications
EDtBP's primary use lies in catalysis, where it serves as a ligand for palladium, nickel, and other metals in cross-coupling reactions. Its steric profile accelerates reductive elimination steps while suppressing unwanted β-hydride elimination. Beyond catalysis, it finds niche applications in materials science for synthesizing phosphine-containing polymers and as a precursor for chiral ligands in asymmetric synthesis. Industrial users often employ EDtBP in pharmaceutical intermediates and fine chemical production due to its tunable reactivity.
Safety and Storage
EDtBP is flammable and moisture-sensitive, requiring storage in sealed containers under inert gas at temperatures below -20°C. Direct exposure should be avoided—use gloves and eye protection in fume hoods. Decomposition may release toxic phosphine gas; ensure proper ventilation. In case of spills, neutralize with dilute hydrogen peroxide and absorb with inert materials. Always consult SDS before handling and dispose of waste via licensed hazardous chemical processors.
B2B Procurement Guide
When procuring EDtBP, prioritize suppliers specializing in air-sensitive organophosphorus compounds. Key specifications include purity (typically ≥95%), residual solvent levels, and packaging integrity (e.g., Schlenk bombs or septum-sealed bottles under argon). Bulk purchases (1kg+) may offer cost savings, but verify batch consistency via COA. Lead times can vary due to synthesis complexity; consider regional distributors for urgent needs. For regulatory compliance, ensure suppliers provide full traceability documentation (REACH, TSCA).
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