Surface organometallic chemistry on metals: influence of organometallic fragments grafted to the surface of Rh particles on the competitive hydrogenation of terminal and internal double bonds of unsaturated primary alcohols

Aqueous phase hydrogenolysis of glycerol to bio-propylene glycol over Pt–Sn catalysts

“…These classic techniques do not assure an efficient control of the bimetallic active phase obtained. The bimetallic catalyst preparation from techniques derived from surface organometallic chemistry on metals SOMC/M is a field of chemistry devoted to the study of the reactivity of organometallic complexes with metallic surfaces (Chupin et al, 2003). It has been demonstrated that organometallic fragments can be grafted by covalent bonding directly onto the metallic surface of platinum particles supported on silica, which provides technical procedures to prepare catalytic systems in a controlled way (Santori et al, 2002).…”

Surface organometallic chemistry on metals: controlled hydrogenolysis of Me4Sn, Me3SnR, Me2SnR2, MeSnBu3 and SnBu4 (R = methyl, n-butyl, tert-butyl, neopentyl, cyclohexyl) onto metallic rhodium supported on silica

“…16,17 Extremely high chemo-, regio-or stereoselectivities can be obtained with catalysts prepared by such a route. 14,16,[18][19][20][21][22][23][24][25][26][27][28][29] Besides, the loss of catalytic activity with time on-stream can be considerably lowered, for example, in the case of isobutane dehydrogenation 25 or n-hexane conversion, 30 with Pt-Sn catalysts prepared by the organometallic route.…”

Cluster Fragmentation and Facile Cleavage of Phenyl Groups from the SnPh3Ligand in Reactions of Os3(CO)11(SnPh3)(μ-H) with CO and HSnPh3

“…The compounds that we have reported here show a sequence of steps for the incorporation of a naked tin into the tetraosmium complex 9 . Even though cluster fragmentation does occur in this reaction sequence, the nature of tin−carbon bond cleavages may be relevant to the incorporation of tin atoms into higher nuclearity clusters and transition metal nanoparticles from organotin reagents in general. 4a, The facile cleavage of phenyl rings from phenyltin ligands may prove to be an effective route to new families of metal carbonyl cluster complexes containing naked bridging tin atoms. Tin-containing cluster complexes are now proving to be useful precursors to new supported bi- and trimetallic heterogeneous catalysts …”

“…Cleavage of phenyl groups from the heteroatoms of phenyl-containing ligands is an important transformation of metal complexes that can lead to catalyst deactivation when it happens in complexes being used for homogeneous catalysis . Tin is widely used as a modifier and promoter of homogeneous and heterogeneous catalysts. − The stepwise hydrogenolysis of tin−carbon bonds of tetraalkyltin compounds is used to produce tin alloys of platinum nanoparticles . There is evidence that tin can assist in the binding of metallic nanoparticles to oxide supports of heterogeneous catalysts …”