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Karnataka Board PUCPUC Science 2nd PUC Class 12

Preparation of Aldehydes and Ketones

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Estimated time: 3 minutes
Maharashtra State Board: Class 12

Key Points: Preparation of Aldehydes and Ketones

  • IUPAC rules: Longest chain with –CHO/–COOH is parent; –CHO/–COOH carbon gets number 1; two ≻C=O in ketones → suffix "dione".
  • Preparation (common methods): Oxidation of 1° alcohols → aldehyde, 2° alcohols → ketone; dehydrogenation (Cu, 575 K); ozonolysis of alkenes; hydration of alkynes (dil. H₂SO₄ + HgSO₄, 333 K).
  • Aldehyde-specific preparations: Rosenmund reduction (RCOCl, H₂/Pd–BaSO₄); Stephen reaction (RCN, SnCl₂·HCl, H₃O⁺); DIBAL-H on nitriles/esters; Etard reaction, Gatterman–Koch formylation for aromatic aldehydes.
  • Ketone-specific preparations: Acyl chloride + R₂Cd; nitrile + R′MgX/dry ether, H₃O⁺; Friedel–Crafts acylation of benzene with RCOCl/anhyd. AlCl₃.
  • Key reactions: HCN → cyanohydrin; NaHSO₃ → bisulphite adduct; R′OH/HCl → acetal/ketal; RMgX → 2°/3° alcohol; NH₂OH → oxime; NH₂NH₂ → hydrazone; Clemmensen (Zn-Hg/HCl) & Wolf–Kishner (NH₂NH₂/KOH) → alkane; K₂Cr₂O₇/H₂SO₄ → carboxylic acid.

Video Tutorials

We have provided more than 1 series of video tutorials for some topics to help you get a better understanding of the topic.

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Shaalaa.com | Aldehydes Ketones part 7 (Aldehyde ,ketone preparation)

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Aldehydes Ketones part 7 (Aldehyde ,ketone preparation) [00:15:50]
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