ORGANIC CHEMISTRY Chapter 12 o In aqueous solutions, the aldehyde initially formed reacts with water to formed an aldehyde hydrate which can then react with HCrOa to form a chromate ester and this can be oxidized to the carboxylic acid R R O r O-H HCrO4 H H H 0-HH O-H O HH R O-H R O-H t hcro t ho H0-Cr-OH O :O- O H Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 12 In aqueous solutions, the aldehyde initially formed reacts with water to formed an aldehyde hydrate which can then react with HCrO4- to form a chromate ester, and this can be oxidized to the carboxylic acid. C O H R H O H C O H R O H H C O H R O H H HCrO4 H C O H R O Cr H O O OH H O H C R O O H + HCrO3 + H3O