Cobalt Schiff's base complexes catalyse highly selective conversion of arylglyoxals to α-aryl-α-hydroxyacetic esters in alcohols; Lewis acidity of CoIII species may be responsible for the catalysis.
Ytterbium triflate was shown to be an effective catalyst in promoting the synthesis of either isopropyl esters or free alpha-hydroxy-arylacetic acids from substituted aromatic glyoxals and aryl methyl ketones, respectively. The reaction to provide acids starting from differently substituted ketones was carried out by an environmentally friendly method using an aqueous medium as a solvent and giving the adducts in 78-99% yield without any further purification after the usual workup.
NISHINAGA, AKIRA;MARUYAMA, KAZUSHIGE;YODA, KOHEI;OKAMOTO, HIROMITSU, J. CHEM. SOC. CHEM. COMMUN.,(1990) N2, C. 876-877