Arom. aldehydes, e.g., vanillin, having electron-releasing para substituents, such as a hydroxy group, are carbonylated to phenylacetic acid derivs. in the presence of a Pd-PPh3-HCl catalytic system, at 90-120°, 50-100 atm of carbon monoxide, 1-2 h, in the presence of water or an alkanol. PPh3 and HCl play key roles in the catalysis, since in their absence no activity is obsd.
Carbonylation of aromatic aldehydes to phenylacetic acid derivatives catalyzed by a palladium-triphenylphosphinehydrogenchloride system
TONIOLO, Luigi
1991-01-01
Abstract
Arom. aldehydes, e.g., vanillin, having electron-releasing para substituents, such as a hydroxy group, are carbonylated to phenylacetic acid derivs. in the presence of a Pd-PPh3-HCl catalytic system, at 90-120°, 50-100 atm of carbon monoxide, 1-2 h, in the presence of water or an alkanol. PPh3 and HCl play key roles in the catalysis, since in their absence no activity is obsd.
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