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- The two molybdenum dimers, [Mo(ButC5H4)(CO)3]2 (i) and [Mo(1,3-di-ButC5H3)(CO)3]2 (ii) were prepared by refluxing Mo(CO)6 in ButC5H5 and in 1,3-di-ButC5H4 similar to the procedure reported for [MoCp(CO)3]2. R.B. King 'Organometallic Syntheses' Academic, New York, 1965, Vol. 1). (i) and (ii) were isolated as red-violet crystalline solids from CH2CL2/n-hexane. (i) IR (KBr disk) ν(C-H)(But) 2985m, 2935sh, 2850sh cm−1; ν(CO) 1932vs, 1903 vs, 1887vs cm−1. 1H NMR(CDCl3) δ1.27 (s, 9H, C(CH3)3), δ5.10 (t, 2H, 2-,5-C5H4), 5.26 (t, 2H, 3-,4-C5H4). (ii) IR (KBr disk) ν(C-H)(But) 2980s, 2930sh, 2850sh cm−1; ν(CO) 1925vs, 1895vs, 1880vs cm−1. 1H NMR(CDCl3) δ1.23 (s, 18H, C(CH3)3), δ4.92 (d, 2H, 4-,5-C5H3), δ5.04 (t, 1H, 2-C5H3).
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