Alkenes reagent

Alkene Reagent R Yield" (%) Alkene Reagent R Yield3 (%) ... 

SODIUM PERBORATE OXIDATION OF ORGANOBORANES a Alkene Reagent Product Yield(%)b... 

Despite the range of sources available, the majority of reactions described have used alcohol or alkene precursors. This reflects both the availability of such materials and their ease of reaction. Typical examples of alkene reagents are shown in equations (9), (10), (11) and (12). When two reactive groups are in close proximity in the substrate it is possible to combine transannular cyclization with Ritter reaction (equation 13). - ... 

Equation 8.69 demonstrates addition to the y position of the t al lyl complex and represents simply the reverse of nucleophilic addition to [Fe(alkene)]+ reagents (see equations 8.39 and 8.40).97 The synthetic utility of this reaction is illustrated in equation 8.70, where the iron complex undergoes conjugate addition to the a,(3-unsaturated diester. The resulting r 2-n ligand then undergoes... 

Entry Starting Ester Crignard Alkene Reagent... 

The synthesis of aldehydes by hydroformylation of alkenes is an important industrial process discovered in 1938. The use of biphasic catalysis, which is a well-established method for the separation of the product and the recovery of the catalyst, was developed for this reaction in the Ruhrchemie-Rhdne-Poulenc process a water-soluble rhodium complex is used as catalyst - the reaction proceeding in water - and the organic layer is formed simply by the alkene reagent and the aldehyde products. Butanal is manufactured this way, but owing to the low solubility of longer olefins in water, this process is limited to C2-C5 olefins. To overcome this limitation, ionic liquids have been studied as a reaction solvent for this biphasic reaction. 

Hydrogenation of olefins catalyzed by transition metal complexes dissolved in ionic liquid solvents have been reported using rhodium-, and ruthenium- and cobalt-containing catalysts. In these studies it was shown that hydrogenation rates where up to five times higher than the comparable reactions when carried out in propanone. The solubilities of the alkene reagents, TOFs, and product distributions where all strongly influenced by the nature of the anion in the ionic liquid solvent... 

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