S. Ishihara, M. Tsukahara and S. Tokita, J. Chem. Soc., Perkin
MgSO4, filtered and concentrated. The desired product was
isolated by precipitation from chloroform as a white solid
(100 mg, 63%). Anal. Calc. for C10H11F3N2S: C, 48.38; H, 4.47;
N, 11.28. Found: C, 48.42; H, 4.37; N, 11.37%. δH(D6-DMSO,
400 MHz): 9.80 (br s, 1H, NH), 8.06 (br s, 1H, NH), 7.68 (d,
J = 8.52 Hz, 4H, Ar), 3.49 (m, 2H, CH2), 1.14 (t, J = 7.04 Hz,
CH3); δC(D6-DMSO, 100 MHz): 179.9, 143.4, 125.8, 123.3,
121.7, 39.4, 13.9; δF(D6-DMSO, 376.46 MHz): Ϫ60.8.
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Acknowledgements
We thank Enterprise Ireland, Kinerton Ltd, and TCD for
financial support, Dr Hazel M. Moncrieff for helpful
discussions and Dr John E. O’Brien for assisting with the
NMR titrations.
18 Since the publication of our communication (ref. 10) several PET
anion sensors have been reported: T. Gunnlaugsson, P. E. Kruger,
T. Clive Lee, R. Parkesh, F. M. Pfeffer and G. M. Hussey,
Tetrahedron Lett., 2003, 35, 6575; K. Kim, N. J. Singh, S. J. Kim,
H. G. Kim, J. K. Kim, L. W. Lee, K. S. Kim and J. A. Yoon,
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Akkaya, Tetrahedron Lett., 2003, 35, 5649; K. Kim and J. T. Yoon,
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19 K. H. Choi and A. D. Hamilton, Coord. Chem. Rev., 2003, 240, 101;
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O r g . B i o m o l . C h e m . , 2 0 0 4 , 2, 1 8 5 6 – 1 8 6 3
1863