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(c) For a sequential procedure, see: Arduengo, A. J. III; Krafczyk, R.; Schmutzler, R.; Craig, H. A.; Goerlich, J. R.; Marshall, W. J.; Unverzagt, M. Tetrahedron 1999, 55, 14523.
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62349089803
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General Procedure for the Synthesis of 1,3-Dialkylimidazolium Tetrafluoroborate Paraformaldehyde (1 equiv) was dissolved in toluene and alkyl amine (1.03 equiv) were added slowly. The mixture was stirred at r.t. for 1 h. After cooling to 0°C another 1.03 equiv of alkyl amine were added. A 3 N solution of HBF4 (1 equiv, 50% in H2O) was added as dropwise and after removal of cooling glyoxal (1 equiv) was added dropwise. The reaction mixture was stirred at 60-75°C for 32-70 h. The solvent was removed under reduced pressure. After column chromatography (SiO2; CH 2Cl2-MeOH, 10:1) the crude product was obtained, which was further purified by recrystallization from CH2Cl2-hexane mixture. 1,3-Diadamantylimidazolium Tetrafluoroborate A total of 0.66 mmol adamantyl amine and 0.32 mmol of other substrates were used. Reaction mixture was stirred for 32 h at 60°C. Yield 95 mg 0.22 mmol, 70
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-1.
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62349133643
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X-ray crystal structure analysis of a-IDAd HBF4: formula C31H41N2BF4·CH 2Cl2, M, 613.39, colorless crystals 0.30 x 0.25 x 0.25 mm, a, 8.0712 (3, b, 14.4584 (5, c, 25.7643 (9) Å, b, 91.599 (1)°, V, 3005.44 (19) Å3, ρcalc, 1.356 g cm-3, μ, 2.364 mm-1, empirical absorption correction (0.537 ≤ T ≤ 0.589, Z, 4, monoclinic, space group P21/n (No. 14, λ, 1.54178 Å, T, 223 (2) K, ω and φ scans, 28618 reflections collected (±h, ±k, ±l, sinθ)/λ, 0.60 Å-1, 5321 independent (Rint, 0.046) and 4684 observed reflections [I ≤ 2 σI, 438 refined parameters, R, 0.054, wR2, 0.145
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14e graphics SCHAKAL (E. Keller, 1997). CCDC 702245 & 702246 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge at www.ccdc.cam.ac.uk/conts/ retrieving.html [or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: +44 (1223)336033, e-mail: deposit@ccdc.cam.ac.uk].
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3-Di-4-diamantylimidazolin-2-ylidene (a-IDAd) a-IDAd HBF4 (20.5 mg, 0.038 mmol, 1.0 equiv) and KOt-Bu (5.0 mg, 0.045 mmol, 1.2 equiv) were mixed in an NMR tube, THF-d 8 (0.5 mL) was added and the NMR experiment was carried out. 1H NMR (300 MHz, 300 K, THF-d8, δ, 7.04 (s, 2 H, imid, 2.12-2.11 (m, 12 H, diam, 1.97 (s, 6 H, diam, 1.81 (s, 20 H, diam, 13C NMR (75 MHz, 300 K, THF-d8, δ, 211.90 (C, carbene, 114.58 (C, imid, 55.14 (NCR3, diam, 45.92 (3 x CH, 40.28 (3 x CH, 38.40 (3 x CH2, 37.82 (3 x CH2, 26.98 (1 x CH, 1,3-Di-1-diamantylimidazolin-2-ylidene (m-IDAd) m-IDAd HBF4 (20.5 mg, 0.038 mmol, 1.0 equiv) and KOt-Bu (7.0 mg, 0.06 mmol, 1.6 equiv) were mixed in an NMR tube, THF-d8 (0.5 mL) was added and the NMR experiment was carried ou
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3), 49.71 (1 x C), 40.63 (2 x C,), 39.66 (1 x C), 38.63 (2 x C), 38.56 (1 x C), 33.95 (2 x C), 33.63 (2 x C), 26.70 (1 x C), 25.50 (1 x C).
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This becomes obvious in the NHC-catalyzed conjugate Umpolung, for which many different NHCs have been screened: (a) Burstein, C.; Tschan, S.; Xie, X.; Glorius, F. Synthesis 2006, 2418.
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