α‐Hydroxymethylen‐verlängerte Aldehyde durch schonende Reduktion von Cyanhydrinen

α‐Hydroxymethylene Elongated Aldehydes by Partial Reduction of Cyanohydrins After acetal‐protection of the hydroxy group, a number of cyanohydrins (derived from aldehydes or ketones) were reduced and hydrolysed to afford α‐hydroxyaldehydes in good yields. Other synthetically useful reactions of the intermediate α‐cyano and α‐formyl acetals have also been studied.