Hydrometallation mechanism

The acquisition of cycloisomerization products without deuterium incorporation is inconsistent with a hydrometallative mechanism. Furthermore, the ab-... 

Before leaving this section we briefly examine hydrometallation mechanisms completely different from the classic one depicted in Scheme 2. One class involves metal hydrides which do not have a readily available vacant site and requires conjugated alkenes — 1,3-dienes, styrenes these proceed via a... 

Most of the transition metal catalyzed reactions are explained in terms of the hydrometallation mechanism (Harrod-Chalk mechanism) summarized in Scheme 2. The alkene coordinates to the metal (M) to give an alkene complex (5), which oxidatively adds to the Si—H bond of the hydrosilane to give (6). 

When trialkylsilanes are employed, vinylsilane is often produced as the main product. This oxidative hydrosilylation can be carried out with [Me3SiCo(CO)4], [Cp 2Rh2Cl4] (equation 29), [ Ir(OMe)(COD))2], [Cp Fe(CO)2SiMe3], or Na[HRu3(CO)i ] catalysts. This unusual reaction is understood in terms of silylmetallation rather than the ordinary hydrometallation mechanism. ... 

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