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Título : Synthesis of Rhodium Complexes with Bulky Substituted Cyclopentadienyl Ligands. H/D Exchange Reactions and Silane Activation
Autor : Esqueda Oliva, Ana Cristina, Conejero Iglesias, Salvador, Maya, Celia, Carmona Guzmán, Ernesto
Palabras clave : Olefin
Cyclopentadienyl ligands
Hydrogen bonding
Fecha de publicación : 19-Jul-2010
Editor: American Chemical Society
Resumen: Rh(I) complexes of the type (η5-C5Me4R)Rh(olefin)2 have been successfully synthesized through a novel procedure that makes use of zincocenes, Zn(C5Me4R)2, as mild cyclopentadienyl transfer reagents. This method proves to be also practical for the preparation of (η5-C5Me4SiR3)Rh(olefin)2 derivatives with no degradation of the C−Si bond of the cyclopentadienyl ligand. Complexes (η5-C5Me4R)Rh(CH2═CHSiMe3)2 have been tested in hydrogen/deuterium scrambling reactions with deuterated benzene. As expected, complexes (η5-C5Me4R)Rh(CH2═CHSiMe3)2 (R = But, 3,5-But2C6H3) incorporate deuterium into the α and β sites of the vinyl silane ligand at faster rates than derivative (η5-C5Me5)Rh(CH2═CHSiMe3)2, but silyl-substituted cyclopentadienyl species (η5-C5Me4SiMe2R′)Rh(CH2═CHSiMe3)2 (R′ = Me, But) exchange hydrogen at β sites of the vinyl silane at slower rates, as a consequence of the steric effects exerted by the SiMe2R groups. Reaction of diolefin compounds (η5-C5Me4R)Rh(C2H4)2 with triethyl silane led to formation of Rh(V) complexes (η5-C5Me4R)Rh(H)2(SiEt3)2 along with carbosilane HEt2SiCH(Me)SiEt3.
Descripción : 9 páginas, 7 figuras, 6 esquemas.
Versión del editor:
ISSN: 0276-7333
DOI: 10.1021/om100412q
Citación : Organometallics 29(21): 5481-5489 (2010)
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