C−H Bond Activation in the Formation of an Osmium(IV) Metallacycle
作者:Jennifer L. Koch、Patricia A. Shapley
DOI:10.1021/om980852w
日期:1999.3.1
The osmium methylimido complex [(eta(5)-C5H5)Os(NCH3)(CH2SiMe3)(2)][SO3CF3], 1, reacts with PPh3 to give both the methyleneamido complex (eta(5)-C5H5)Os(NCH2)(CH2SiMe3)(2), 2, and the unique osmirtm(IV) hydride [(eta(5)-C5H5)Os(H)(PPh3)CCHSiMe3PPh2(C6H4)}][SO3CF3], 4 A single-crystal X-ray diffraction study of 4 shows that this molecule has a distorted square pyramidal structure with the center of the cyclopentadienyl ring at the apex: This molecule results from a series of reactions that includes two C-H activation steps: alpha-hydrogen elimination and orthometalation.