METHOD FOR THE SELECTIVE HYDROLYSIS OF ACETALS OR KETALS IN THE PRESENCE OF PHTHALIDES

摘要

The invention relates to a method for the selective hydrolysis of acetals in the presence of phthalides. According to said method a mixture (M) containing a) a phthalide of the formula (I) and b) an acetal or ketal of the formula (II) is reacted in the presence of between 1 and 10 mol water relative to the quantity of acetals or ketals of formula (II) at temperatures of between 10 and 200 ~C, whereby the acetal or ketal of formula (II) is hydrolysed to the corresponding aldehyde or ketone. The substituents R1-R8 have the meanings given in the description.