Chemistry of [CpCr(CO)3]₂
An insertion mechanism for the formation of Cp₂Cr₂(CO)₅Se₂ and Cp₂Cr₂(CO)₄Se₂ from Cp₂Cr₂(CO)₄Se. Carbonylation and crystal structure of Cp₂Cr₂(CO)₄Se₂
The complexes Cp2Cr2(CO)4Se2 (2) and Cp2Cr2(CO)5Se2 (3) are obtained as dark brown crystals, from the reaction of elemental selenium with Cp2Cr2(CO)6 or Cp2Cr2(CO)4Se (1). Synthetic and spectral evidence indicates that the reaction proceeds via the insertion of a Se atom into the Cr≡Se bond of 1. Complexes 2 and 3 have been characterized by elemental and spectral analyses. The X-ray structure of 2 shows a symmetrical μ-η2-Se2 ligand bridging the two chromium centers. Crystal data: monoclinic P21/c; a = 10.566 (2) Å, b = 12.983 (3) Å, c = 11.964 (2) Å; β = 101.05 (3)°; Z = 4; R = 0.055. The slow conversion of 2 under a CO atmosphere to a mixture of 1, 3, and Cp4Cr4Se4 (4) as well as the transformation of the very labile complex 3 to 1, 2, and 4 has been demonstrated by NMR spectral studies. © 1988 American Chemical Society.
W. Chen et al., "Chemistry of [CpCr(CO)3]₂," Organometallics, American Chemical Society (ACS), Jan 1988.
The definitive version is available at http://dx.doi.org/10.1021/om00099a019
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© 1988 American Chemical Society (ACS), All rights reserved.