4-Trifluoromethoxyphenylboronic Acid

Technical Specifications

Product Description & Scientific Applications

4-(Trifluoromethoxy)phenylboronic acid (4-(trifluoromethoxy)benzeneboronic acid) is a fluorinated arylboronic acid bearing the trifluoromethoxy (OCF₃) group at the para position. OCF₃ is moderately electron-withdrawing and highly lipophilic, a useful 4-(trifluoromethoxy)phenyl substituent for medicinal-chemistry, agrochemical, and fluorinated-materials research.

May contain small amounts of the cyclic anhydride 4-(trifluoromethoxy)phenylboroxine. Under aqueous or basic coupling conditions the two forms re-equilibrate and the impact on yield is minor.

Applications and Reactions

• Suzuki–Miyaura coupling: couples with aryl, heteroaryl, and alkenyl halides or pseudohalides under Pd catalysis to install the 4-(trifluoromethoxy)phenyl fragment onto biaryl, heterobiaryl, and styrenyl scaffolds.
• Boronate–water equilibrium and acidity: pKa 8.11 ± 0.04 (spectrophotometric) and 8.03 ± 0.07 (potentiometric), roughly 0.7 units below the parent phenylboronic acid (pKa ≈ 8.8) but less acidic than the 4-trifluoromethyl analogue (7.82 / 7.90). The narrower gap relative to CF₃ reflects partial oxygen lone-pair donation attenuating the inductive effect of OCF₃.
• Liquid-crystal building block: Suzuki–Miyaura coupling via the 1,3,2-dioxaborinane or pinacol boronate ester installs the 4-(trifluoromethoxy)phenyl fragment into biphenyl, ethynyl-biphenyl, and ester-linked rod-like mesogenic cores. Infrared-oriented liquid-crystal studies on these intermediates evaluate mesomorphic behaviour, phase-transition temperatures, refractive indices, birefringence, and mid-wave infrared properties.
• Perovskite solar-cell interface modifier: investigated as a fluorinated phenylboronic-acid modifier at the perovskite/C₆₀ interface in inverted (CsFAMA)Pb(IBr)₃ cells, alongside its 4-trifluoromethyl analogue. Modifiers of this class passivate interfacial defects, suppress non-radiative recombination, enhance charge extraction, and reduce trap-state density; the 4-trifluoromethyl analogue showed stronger device performance than the 4-(trifluoromethoxy) analogue.
• Chan–Lam coupling: the boronic acid acts as the aryl donor in copper-mediated C–N, C–O, and C–S bond formation under aerobic conditions, transferring the 4-(trifluoromethoxy)phenyl group to amines, anilines, amides, phenols, alcohols, or thiols.
• Petasis borono-Mannich reaction: arylboronic acids act as aryl donors in three-component reactions with an amine and an aldehyde, glyoxylic acid, or α-hydroxy aldehyde to give arylated amines, α-aryl glycine derivatives, or β-amino alcohol scaffolds.
• Protodeboronation and condition sensitivity: stability under aqueous-basic conditions depends on substituent, pH, base, concentration, and temperature; pH-controlled speciation influences decomposition. Prolonged warm aqueous-basic exposure is managed by base, concentration, temperature, and time; slow-release boron formats suit extended coupling.
• Protected boronate ester forms: the pinacol ester is commercially available as a protected form for handling and Suzuki–Miyaura coupling. MIDA boronates and potassium organotrifluoroborates improve shelf stability and enable controlled-release coupling.

Further Reading

For boronic acids, boronic esters, protodeboronation, boroxine content, and Suzuki–Miyaura reagent selection, see NorrChemica's Lab Journal guide: Choosing Your Boron Source for Suzuki–Miyaura Coupling.

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