Syntheses of Carboxylic Acids The previously seen syntheses(three)all involved oxidation: (a)oxidation of primary alcohols and aldehydes (b)oxidative cleavage of alkenes and alkynes (c)side chain oxidation of alkyl benzenes Oxidation of Primary Alcohols and Aldehydes These oxidations are best performed using chromic acid(made from Na2Cr2O7 and H2SO4).Potassium permanganate can be used but gives lower yields. E.g. Na2Cr207,H2SO4 Ph、入O-H O-H Ch20 Carboxylic Acids (landscape) Page 12 Ch20 Carboxylic Acids (landscape) Page 12 Syntheses of Carboxylic Acids The previously seen syntheses (three) all involved oxidation: (a) oxidation of primary alcohols and aldehydes (b) oxidative cleavage of alkenes and alkynes (c) side chain oxidation of alkyl benzenes Oxidation of Primary Alcohols and Aldehydes These oxidations are best performed using chromic acid (made from Na2Cr2O7 and H2SO4). Potassium permanganate can be used but gives lower yields. E.g. Ph O-H Ph O-H O Na2Cr2O7 , H2SO4