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Published byMarquise Arbon Modified over 9 years ago
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CARBOXYLIC ACIDS Properties and Synthesis
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NOMENCLATURE
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-oic acid IUPAC ending -carboxylic acid IUPAC ending for ring compounds IUPAC NOMENCLATURE
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3-Methylbutanoic acid -Methylbutyric acid Isovaleric acid 2-Chloropentanoic acid -Chlorovaleric acid Naming
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2-Methylpropanoic acid -Methylpropionic acid Isobutyric acid 4-Aminobutanoic Acid -Aminobutyric Acid “GABA” Naming
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Benzoic acid Benzenecarboxylic acid Cyclohexanecarboxylic acid More Naming
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Common Names
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SYNTHESIS OF SYNTHESIS OF CARBOXYLIC ACIDS
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Oxidation of Primary Alcohols with KMnO 4 with KMnO 4 two -hydrogens + MnO 2 precipitate
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Oxidation of Primary Alcohols with K 2 Cr 2 O 7 with K 2 Cr 2 O 7
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Oxidation of Side Chains Example KMnO 4
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Carbonation of Grignard Reagents ( or Alkyllithium Compounds ) ( R-Li )
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Formation of Nitriles and Hydrolysis DMSO H 2 SO 4 H2OH2O heat SN2SN2
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or CO 2 CrO 3 H 2 SO 4 KMnO 4 H 2 SO 4 KMnO 4 NaCN acetone DIBAL or Rosenmund KMnO 4 Li or Mg H2OH2O H2OH2O H 2 SO 4 H2OH2O or KMnO 4 SYNTHESIS OF CARBOXYLIC ACIDS ( DUE TO LACK OF SPACE REACTION CONDITIONS ARE ABBREVIATED) KMnO 4 ( benzene = R sidechain = R’ ) This is all stuff you know! SOCl 2 Chap 19
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ACIDITY
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Carboxylate Ion Formation They are acids, ya know ! pK a 5 carboxylate ioncarboxylic acid
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+ +.. : : H 2 SO 4.. : + Protonation and Deprotonation of a Carboxylic Acid.. : NaOH.. : - equivalent structures due to resonance
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Electron-withdrawing Groups: –strengthen acids –weaken bases Electron-releasing Groups: –weaken acids –strengthen bases
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Substituents with Electron-Withdrawing Resonance ( - R ) Effects -R substituents strengthen acids and weaken bases X Y
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+R substituents weaken acids and strengthen bases Substituents with Electron-Releasing Resonance ( + R ) Effects hydroxy mercapto methyl amino fluoro bromo alkoxy acyloxy dialkylamino alkyl chloro iodo Y..
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Substituents with Electron-Withdrawing ( - I ) Inductive Effects ( - I ) Inductive Effects -I substituents strengthen acids and weaken bases carboxyl alkoxycarbonyl acyl hydroxyl mercapto amino chloro nitro cyano sulfonic acid alkoxy dialkylamino trimethylammonium fluoro bromo iodo X
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Substituents with Electron-Releasing Inductive ( + I ) Effects +I substituents weaken acids and strengthen bases methyl alkyl oxide carboxylate R
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increasing acidity
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Benzoic Acid: pK a = 4.19 ortho meta para ortho meta para
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Benzoic Acid: pK a = 4.19 2.97 4.06 4.48 4.08 4.46
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Benzoic Acid: pK a = 4.19
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