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Alkenylation ligand effects

SCHEME 24.34 Ligand effects for the aerobic alkenylation of arenes. [Pg.695]

SCHEME 24.35 Ligand effects for arene alkenylation using PhCO Bu. [Pg.695]

As mentioned above, a- and / -isomers 83 and 84 differ not only in the substitution pattern at the alkenyl ligand but also in the relative orientations of the phosphorus-containing ligands. This has a pronounced effect on... [Pg.231]

A theoretical investigation into the copper hydride-catalysed hydrosilylation of 3-methylcyclohex-2-enone addressed the mechanism and ligand effects. Methallylboranes CH2=C(R)CH2B(pin) can deliver the allyl group to electron-deficient alkynes RC=CX (R = alkyl, alkenyl, heteroaryl X = CO2R, CN, CONRR, SO2R) in a Michael manner with iyn-stereochemistry in the presence of Cu(OAc)2 as catalyst. ... [Pg.414]

The reaction which is accelerated by the presence of water can be carried out in water when a 2/3-cyclodextrin-[Rh(OH)(cod)]2,943,944 [Rh(cod)Cl]2/TPPTS,945 or amphiphilic resin-supported rhodium(i) complex was used.946 It was also reported that potassium alkenyl and aryltrifluoroborates [RBF3]K undergo similar addition to enones in the presence of an Rh(i) catalyst.935,947,948 The cationic rhodium(i) complexes such as [Rh(cod)]BF4, [Rh(cod)(CH3CN)2]BF4, or its combination with a diphosphine ligand (dppp or dppb) efficiently catalyzed the reaction. The neutral complexes, generated in situ from Rh(acac)(GH2=GH2)2, or Rh(acac)(coe)2, and dppp or dppb, were also effective. The effects of catalysts, solvents, and bases,949 and the mechanism of catalytic cycle950 have been studied in detail. [Pg.214]

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See also in sourсe #XX -- [ Pg.694 , Pg.697 ]



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Alkenyl ligands

Ligand effect

Ligand effective

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