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The synthesis of complexes of the general formula Cl 2 Ru-(SIMes)(L)(3-phenylinden-1-ylidene) (5, L = PCy 3 ; 6, L = py; and 7, L = PPh 3 ) from Cl 2 Ru(PR 3 ) 2 (3-phenylinden-1-ylidene) (2a, R = Ph; 2b, R = Cy) is reported. This family of olefin metathesis catalysts was fully characterized ( 1 H, 13 C and 31 P NMR spectroscopy and elemental analysis) and provided excellent activity in the ring-opening metathesis polymerization of 1,5-cyclooctadiene and the ring-closing metathesis of

Recent trends in Ru complex chemistry are surveyed with emphasis on the development of anticancer drugs and applications in catalysis, polymers, materials science and nanotechnology.

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