, MANUSCRIPT

, 5-di-tert-butylbenzyl)-3-(2,4,6-trimethylbenzyl)benzimidazole-2-ylidene](pyridine)palladium(II), (2e) Yield: 0.26 g, 74%; mp: 259-260 o C. 1 H NMR, pp.1-21

, 30 (s, 9H, NCH2C6H2(CH3)3-2,4,6)13 (s, 2H, NCH2C6H3(C(CH3)3)2-3,5), pp.15-17

, CH3)3-2,4,6, NCH2C6H3(C(CH3)3)2-3,5 and NC5H5) 13 C NMR (100 MHz, CDCl3): 21.0 and 21, NCH2C6H2(CH3)3-2, pp.31-36

, NCH2C6H3(C(CH3)3)-3,5)) IR (cm -1 ) v(CN): 1410; Anal

, 6-tetramethylbenzyl)benzimidazole-2-ylidene](pyridine)palladium(II), (2f) Yield: 0.29 g, 77%, o C. 1 H NMR (400 MHz, CDCl3): 1.21 (s, 18H, NCH2C6H3(C(CH3)3), pp.267-2682

, ), 2.20 and 2.21 (s, 12H, NCH2C6H(CH3)4-2,3, pp.1416-1418

, NCH2C6H3(C(CH3)3)2-3,5 and NC5H5) 13 C NMR (100 MHz, CDCl3): 15.6 and 19, m, 13H, NC6H4N, NCH2C6H(CH3)4-2,3NCH2C6H(CH3)4-2,3, pp.5-7

, )3)-3,5)), Pd-Ccarbene). IR (cm -1 ) v(CN): 1416; Anal. Calcd. for C38H47Br2N3Pd: C, pp.56-77

, 5.83; N, 5.17. Found: C, 56.24; H, 5

, 3-(4-tert-butylbenzyl)benzimidazole-2-ylidene](pyridine)palladium(II), (2g) Yield: 0.32 g, 87%; mp: 264-265 o C. 1 H NMR (400 MHz), CDCl3): 1.23 (s, 27H, NCH2C6H3(C(CH3)3)2-3, pp.2-6

, )3)2-3, NCH2C6H4(C(CH3)3-4) and NC5H5). 13 C NMR, pp.98-129

, C(CH3)3)2-3,5), pp.31-36

, C(CH3)3)2-3,5) 13 C NMR (75 MHz, CDCl3): 111(C(CH3)3-4) and NC5H5) IR (cm -1 ) v(CN): 1414; Anal, 7 (NC6H4N, NCH2C6H3(C(CH3)3)2-3, pp.2-6

, Yield: 0.23 g, 67%; Yield: 0.21 g, 72%; mp: 206-207 o C. 1 H NMR (400 MHz, CDCl3): 1.22 (s, 36H, NCH2C6H3(C(CH3)3)2-3,5), 17 (s, 4H, NCH2C6H3(C(CH3)3), pp.3-13

, 3 (NCH2C6H3(C(CH3)3)2-3,5) (Pd-Ccarbene) IR (cm -1 ) v(CN): 1411; Anal, NC6H4N, NCH2C6H3(C(CH3)3)2-3,5 and NC5H5

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, Table 1 Bond lengths Bond angles Pd1-C6 1.952(7) C6-Pd1-N1 177, ) Pd1-N1 2.087(6) C6-Pd1-Br1 89.1(2) Pd1-Br1 2.426(1) C6-Pd1-Br2) N1-Pd1-Br2 90, pp.1-1364