Its main objective is the creation on a support (which can be an oxide, a clay, a polymer etc.), of organometallic fragments which will be well-defined and uniform along the entire surface. The expected reaction can simply be written by replacing one alkyl ligand by one hydrogen, one alkylidene one by two hydrogens and one alkylidyne one by three hydrogens with evolution of the corresponding alkane. Chem., 2013, 2013, 5969–5979 CrossRef CAS.N. Millot, C. C. Santini, F. Lefebvre and J. M. Basset, C. R. Chim., 2004, 7, 725–736 CrossRef CAS PubMed.M. E. Bartram, T. A. Michalske and J. W. Rogers Jr., J. Phys. The expected reaction (transfer of a methyl group from zirconium to boron) is observed but it is not the major species on the surface. Delays that, in theory, should be 1/[4 × (3J XeF)] were set to a shorter value of 15.6 ms to offset the effects of relaxation.
Phys. Lett. 179 , 191–194. CrossRefGoogle Scholar ↵ Freitag, A., van Wuellen, C. & Staemmler, V. (1995) Chem. Reaction of this complex with silica dehydroxylated at high temperature leads to the formation of the well-defined species ≡Si–O–ZrCp*Me2 (Scheme 1.9) which can further react with B(C6F5)3 without the need of a tertiary amine. Catal. A: Chem., 2006, 257, 31–40 CrossRef CAS PubMed.R. M. Gauvin and A. Mortreux, Chem. However, instead of the expected neopentane, only methane (and ethane in the case of group 4 elements) is observed in the gaseous phase. The most complex support is probably carbon, as its surface contains a lot of functional groups covering all the fields of organic chemistry. The mechanism (Scheme 1.3) passes through an attack of the tin complex by the acidic proton of the heteropolyacid followed by a migration of the grafted tin species on the surface and restoration of the acidic proton.
Phys. 192 , 267–280. CrossRefGoogle Scholar ↵ Childs, G. (2000) Ph.D. thesis (Univ. of Nottingham, Nottingham, U.K.). Google Scholar. These species will be characterized by all available physico-chemical methods in order to have a description of the coordination sphere around the metal as precise as possible, as for homogeneous complexes. First of all, it is necessary to choose an organometallic compound with a M′–X bond for which the reaction M–OH+[M′]–X→M–O–[M′]+HX will be favored thermodynamically, M–OH being a hydroxyl group of the support.