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A method for the conversion of allyl alcohol into glyceraldehyde derivatives by the cooxidation with thiol by oxygen and the successive Pummerer reaction is described. Several methods to transform ti-hydroxy or ti-oxo sulfoxides into "activated ester forms" of a-hydroxy acids are reported. By these methods, derivatives of mandelic acid and lactic acid were prepared from 2-hydroxy-2-phenylethyl p-tolyl sulfoxide and phenylsulfinylacetone, respectively. From a derivative of !'i-alanine were prepared some derivatives of 4-amino-2-hydroxybutyric acid which is used for the modification of aminoglycoside antibiotics.