A highly electron-deficient aromatic thiol bearing two strongly-withdrawing CF₃ groups at the 3- and 5-positions. The strongly lowered pKa (≈ 4.9) and high oxidative stability make it a privileged building block for:
Julia-Kocienski olefination reagent (BTFPSH): the derived sulfone is shelf-stable and delivers >90 % (E)-selectivity in one-pot Julia couplings to construct fluorinated stilbenes and agrochemical intermediates .
High-index thiol–ene optical resins: photopolymerisation with triallyl isocyanurate yields colourless films (n = 1.65, Tg 135 °C, YI <1 after 500 h Q-UVB) for 5G lens substrates and OLED encapsulation layers.
Silver-antimicrobial self-assembled monolayers: the densely packed fluorinated surface (water contact angle 100°) sustains >99 % bacterial kill after 24 h and suppresses Ag tarnishing in saline atmospheres.
Palladium-selective scavenger: the soft sulfur and electron-poor ring form a stable Pd(II) complex (log K = 19.2), enabling recovery of Pd from spent cross-coupling liquors to <0.1 ppm residual.
UV-absorbing functional monomer: incorporated at 1–3 wt % into acrylic resins it imparts broad-spectrum UV-A/UV-B absorption (λmax 295 nm, ε 18 000) for clear sunscreen films and optical coatings .
Store under nitrogen at 2–8 °C, away from light and oxidants to prevent disulfide formation.
