Promoted by transition metal complexes

In homogeneous solutions NO disproportionation maybe promoted by transition metal complexes, and a variety of mechanisms seem to be available owing to the many possible modes of coordination. One example is the reaction of NO with nickel carbonyl shown in Eq. (35) (76),... 

Carbonylations of olefins, acetylenes, halides, alcohols, amines, nitro compounds, etc., promoted by transition metal complexes are very important in both industrial and laboratory organic syntheses. The mechanisms of those reactions have been studied extensively, especially for those associated with commercial processes. " The research... 

Innovations in the chemistry of aromatic compounds have occurred by recent development of many novel reactions of aryl halides or pseudohalides catalysed or promoted by transition metal complexes. Pd-catalysed reactions are the most important [2,29], The first reaction step is generation of the arylpalladium halide by oxidative addition of halide to Pd(0). Formation of phenylpalladium complex 1 as an intermediate from various benzene derivatives is summarized in Scheme 3.1. 

There are several types of reactions of hydro silanes that are promoted by transition metal complexes. In addition to homodehydrocoupling, Eq. (1) and heterodehydrocoupling, Eq. (2) (this process is sometimes referred to as dehydrogenative coupling), and disproportionation, Eq. (3) (only one possibility is depicted), an additional process and one of the most popularly employed is the addition of a Si-H bond to a substrate that contains a multiple bond. The addition reaction is referred to as hydrosilylation and a generalized example is shown in Eq. (4). 

Homodehydrocoupling is only one reaction of hydrosilanes that is promoted by transition metal complexes. In the development of pre-catalysts... 

Tire deoxygenation of CO2 promoted by transition metal complexes merits some special considerations. Both the reduction to CO as well the disproportionation to CO and COj will be discussed. 

In the previous review [1] various reactions involving the cleavage of C-0 bonds in organic compounds activated by transition metal complexes were treated. The present review is mainly concerned with the later development in the C-0 bond activation with inclusion of essential concepts related to the C-O bond cleavage reactions promoted by transition metal complexes. 

Utilizing the processes involving the allylic C-0 bond cleavage promoted by transition metal complexes and combining them with subsequent other processes, such as nucleophilic attack, CO insertion, hydrogenolysis, etc., one can de-... 

Catalytic Processes Using CO, Promoted by Transition Metal Complexes... 

The transmetalation of organosilanes, SiR4, with transition metal complexes is uncommon due to the stable and non-polar Si-C bond [67], Although Si-C bond activation of tetraorganosilanes promoted by transition metal complexes is known, the intermolecular (Eq. 5.18) [68-71] and intramolecular (Scheme 5.10) [72-78] reactions are classified into oxidative addihon more appropriately than transmetalation. 

Recent Advances in Catalytic Asymmetric Reactions Promoted by Transition Metal Complexes"... 

A new protecting group for amines has been studied and used in the first chiral synthesis of anticapsin. The route involves initial bis-allylation to give a base-stable group resistant to nucleophiles, but which can be easily deprotected using the known allyl-to-propenyl isomerization reaction promoted by transition-metal complexes (Scheme 11). 

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