2-(Diphenylphosphino)benzoic acid (DPPBA) is a privileged organophosphorus ligand and synthetic intermediate in homogeneous catalysis and pharmaceutical chemistry. Its bifunctional structure (phosphine + carboxyl) enables strong coordination with transition metals (Pd, Ru, Rh), forming stable catalysts for cross-coupling reactions—including Suzuki-Miyaura, Heck, Buchwald-Hartwig, and Sonogashira couplings—widely used in C–C and C–N bond formation for drug intermediates and fine chemicals. It serves as a key ligand in the Shell Higher Olefin Process (SHOP) for industrial α-olefin production. In asymmetric synthesis, it constructs chiral Trost ligands for Pd-catalyzed allylic alkylation, enabling high regio- and stereoselectivity in building complex molecular skeletons with quaternary carbons. It mediates Staudinger reduction for selective azide-to-amine conversion, critical for bioconjugation and protein modification. Additionally, it acts as a chelating agent in analytical chemistry and a building block for phosphine-based supramolecular materials, supporting both academic research and industrial manufacturing.

This organophosphorus compound is classified as GHS Category 4 (harmful if inhaled) with irritant properties (H315: skin irritation; H319: serious eye irritation; H335: respiratory irritation). Inhalation of dust causes sore throat, cough, and chest tightness; high concentrations may trigger headache, dizziness, or nausea. Skin contact leads to redness, itching, and mild dermatitis; prolonged or repeated exposure damages the skin barrier. Eye contact induces severe stinging, tearing, and conjunctival inflammation—immediate 15+ minute water rinsing is required. Accidental ingestion causes nausea, vomiting, and abdominal discomfort; large doses may affect gastrointestinal function. Operate in a fume hood with dust respirator, chemical-resistant gloves, and safety goggles. Store sealed, dry, and separated from food, feed, and oxidants. Dispose of waste per hazardous waste regulations to avoid water/soil contamination. Though stable under normal conditions, avoid heating to prevent toxic phosphorus oxide fume release.