Reformatskyreactions of a phenyl ketone, an alpha-bromoester, zinc dust, and a catalytic amount of iodine in dioxane under high-intensity ultrasound (HIU) irradiation from an ultrasonic probe give high yields of beta-hydroxyesters in short reaction times. A series of alkyl phenyl ketones with increasing steric demands of the alkyl group are evaluated as potential electrophiles for the reactions with
Treatment of a mixture of α-halogeno-esters and carbonyl compounds with low-valent tantalum prepared readily from tantalum(V) chloride and activated zinc, afforded β-hydroxy-esters in moderate to good yields.