Overview
Pinacol borate is a versatile organoboron reagent derived from pinacol and boronic acid. It serves as a stable precursor for boronic acids and esters in synthetic chemistry. Due to its role in Suzuki-Miyaura coupling—a pivotal reaction in drug discovery—it is a high-demand chemical in pharmaceutical and agrochemical industries. The compound’s stability under anhydrous conditions makes it preferable over reactive boronic acids for certain applications. Its synthesis typically involves the esterification of boronic acids with pinacol, yielding a moisture-sensitive but tractable product.
Physical and Chemical Properties
Pinacol borate is a low-viscosity liquid with a mild odor, characterized by its rapid decomposition in the presence of water or protic solvents. Its molecular structure features a boron atom bonded to two oxygen atoms in a cyclic dioxaborolane ring, flanked by four methyl groups that confer steric protection. Key reactivity includes transesterification with diols and participation in palladium-catalyzed cross-coupling reactions. The compound’s solubility profile favors organic media, though it hydrolyzes readily to release pinacol and boronic acid derivatives.
Main Applications
The primary use of pinacol borate lies in palladium-catalyzed cross-coupling reactions, notably the Suzuki-Miyaura coupling, which constructs biaryl scaffolds for pharmaceuticals like antihypertensives and antivirals. It also serves as a boron carrier in materials science, e.g., for synthesizing OLED components. In agrochemical production, it aids in creating fungicides and herbicides. Additionally, research labs employ it to generate boronic esters in situ, avoiding the handling of unstable boronic acids.
Safety and Storage
Pinacol borate is flammable (flash point ~25°C) and reacts exothermically with water. Storage requires airtight containers under nitrogen or argon, ideally at 2-8°C. Leaks should be contained with inert absorbents like sand, and contaminated surfaces cleaned with ethanol. Personal protective equipment (PPE)—gloves, goggles, and flame-resistant lab coats—is mandatory. Spill kits and dry-powder fire extinguishers must be accessible in handling areas. Always consult the MSDS for region-specific regulations.
B2B Procurement Guide
When sourcing pinacol borate, prioritize suppliers with ISO-certified facilities and batch-specific certificates of analysis (COA). Key parameters to verify include purity (≥95%), residual solvent levels, and moisture content (<0.1%). Bulk buyers should negotiate for nitrogen-flushed drums or custom packaging to minimize degradation. Spot-check deliveries for discoloration or particulate matter, which indicate contamination. Long-term contracts with price adjustments clauses can hedge against market volatility.
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