Chemical Formula: C₁₈H₁₅P
Molecular Weight: 262.285 g/mol
CAS Number: 603-35-0
EINECS Number: 210-036-0
Appearance: White to pale yellow crystalline powder or flaky solid, solid at room temperature, odorless or slightly odorous.
Melting Point: 78.5–81.5 °C (consistent with most authoritative sources)
Boiling Point: 377 °C (at normal pressure). Some sources measure it at 337 °C (1.0 mmHg) under reduced pressure.
Density: Approximately 1.132–1.194 g/cm³ (25 °C)
Flash Point: 180–181 °C
Water Solubility: Insoluble in water (solubility approximately 0.00017) g/L (22 °C) 3; Slightly soluble in ethanol, readily soluble in organic solvents such as benzene, ether, chloroform, and acetone.
Vapor density: Approximately 9 (relative to air)
Refractive index: Approximately 1.5918–1.6358 (20 °C)
Stability: Stable at room temperature, but easily oxidized by air to triphenylphosphine oxide (OPPh₃); Sensitive to moisture and oxygen.
Incompatible materials: Strong oxidizing agents, strong acids.
