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Benzynes were generated from o-(trimethylsilyl) phenols using nonafluorobutanesulfonyl fluoride (NfF) by a domino process.Nonafluorobutanesulfonyl fluoride (nonaflyl fluoride, C 4 F 9 SO 2 F, NfF) is the most widely used commercially available reagent for the synthesis of nonaflates.
Takashi Ikawa,; Tsuyoshi Nishiyama,; Toshifumi Nosaki,; Akira Takagi,; Shuji Akai. A Domino Process for Benzyne Preparation: Dual Activation of o-(Trimethylsilyl)phenols by Nonafluorobutanesulfonyl Fluoride. Org. Lett., . 2011, 13 (7), 730-1733.
Jens Högermeier,; Hans-Ulrich Reissig. Nine Times Fluoride can be Good for your Syntheses. Not just Cheaper: Nonafluorobutanesulfonates as Intermediates for Transition Metal-Catalyzed Reaction. Advanced Synthesis & Catalysis. 2009, 351 (17), 2747-2763.
Reagent for formation of nonafluorobutanesulfonates (nonaflates) of OH groups (compare Trifluoromethanesulfonic anhydride, A11767), e.g. with triethylamine in ether: Synthesis, 293 (1973); Liebigs Ann. Chem., 20 (1973).
Nonaflates of phenols, which are stable to flash chromatography, are attractive precursors for coupling reactions, with alkyl- and arylzinc halides, arylboronic acids (Suzuki) and arylstannanes (Stille), catalyzed by Pd(0) under mild conditions: J. Org. Chem., 63, 203 (1998). Silyl enol ethers, with catalytic TBAF in the presence of molecular sieves, are converted to enol nonaflates which undergo Heck couplings, e.g with styrenes to give 1,3-dienes: Synlett, 1141 (1997).
Hazard Statements: H314-H318
Causes severe skin burns and eye damage. Causes serious eye damage.
Precautionary Statements: P260u-P303+P361+P353-P305+P351+P338-P301+P330+P331-P405-P501a
Do not breathe dusts or mists. IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF SWALLOWED: Rinse mouth. Do NOT induce vomiting. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.