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Fig. 6 Recyclability of catalyst 6 and 7 for the Sonogashira cross-coupling
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1-(2-Mesitylethynyl)benzene (Table 4, entry 15). White solid.
1H NMR (CDCl3, 300 MHz); dH (ppm) 2.32 (s, 3H), 2.50 (s, 6H),
7.35 (s, 1H), 7.36–7.38 (m, 2H), 7.55 (d, 2H, J = 2.1 Hz), 7.57 (d,
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121.8, 127.6, 128.3, 128.4, 129.2, 131.3, 132.5, 137.8, 140.2.
C
17H16 [M]+: 220.
2,6-Bis(2-phenylethynyl)pyridine (Table 4, entry 16). Yellow
solid. 1H NMR (CDCl3, 300 MHz); dH (ppm) 7.38 (d, 2H, J =
1.5 Hz) 7.40 (d, 4H, J = 2.4 Hz), 7.49 (s, 1H), 7.51 (s, 1H,), 7.62 (d,
2H, J = 3.9 Hz), 7.64 (d, 2H, J = 2.1 Hz), 7.68–7.73 (m, 1H).
13C NMR (75 MHz, CDCl3)d 88.2, 89.7, 126.2, 128.4, 129.1,
132.1, 136.5, 143.8. GCMS C21H13N [M]+: 279.
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4-(2-p-Tolylethynyl)benzonitrile (Table 4, entry 18). White
solid, mp (obs) = 45–46 1C, mp (lit) = 44–46 1C.23 1H NMR
(CDCl3, 300 MHz); dH (ppm) 2.38 (s, 3H), 7.16 (d, 4H, J = 8.1 Hz),
7.42 (d, 4H, J = 8.1 Hz). 13C NMR (75 MHz, CDCl3)d 21.6, 73.4,
81.4, 118.8, 129.2, 132.3, 139.6. GCMS C16H11N [M]+: 217.
Acknowledgements
One of the authors Sanjay Jadhav thanks the University Grants
Commission, New Delhi, India for the award of the SAP-BSR
fellowship.
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(b) D. W. Kim and D. Y. Chi, Angew. Chem., Int. Ed., 2004, 43,
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