Isobutyraldehyde → 2,2-Dimethyl-3-(3,5-dimethylphenyl)-propionaldehyde

HRID 985904

Reaktionsgleichung

Reaktionsgleichung von HRID 985904
[OH-].[Na+].[CH3:3][C:4]1[CH:5]=[C:6]([CH:9]=[C:10]([CH3:12])[CH:11]=1)[CH2:7]Cl.[CH:13](=[O:17])[CH:14]([CH3:16])[CH3:15]>[Br-].C([N+](C)(C)C)CCCCCCCCCCCCC.[I-].[K+].C1(C)C=CC=CC=1.O1CCCC1>[CH3:15][C:14]([CH3:16])([CH2:7][C:6]1[CH:5]=[C:4]([CH3:3])[CH:11]=[C:10]([CH3:12])[CH:9]=1)[CH:13]=[O:17]

Komponenten

8

Edukt 3

HCID 6561IsobutyraldehydeHCID 14798Sodium HydroxideHCID 1377003,5-Dimethylbenzyl chloride

Produkt 1

HCID 137973112,2-Dimethyl-3-(3,5-dimethylphenyl)-propionaldehydeAusbeute 92 %

Reagenzien, Katalysatoren, Lösungsmittel 4

HCID 4875Potassium IodideKatalysatorHCID 14250Tetradecyltrimethylammonium bromideKatalysatorHCID 1140TolueneLösungsmittel2×HCID 8028TetrahydrofuranLösungsmittel2×

Reaktionsbedingungen

Temperatur
75 °C

Versuchsvorschrift

A pre-mix of 125 g of 30% by weight sodium hydroxide solution, 5 g of potassium iodide, 10 g of tetradecyltrimethylammonium bromide, 200 ml of tetrahydrofuran and 200 ml of toluene was heated to 75° C. A mixture of 155 g of 3,5-dimethylbenzyl chloride, 110 g of isobutyraldehyde, 50 ml of tetrahydrofuran and 50 ml of toluene was added dropwise to this pre-mix while stirring vigorously. The entire mixture was then boiled under reflux for 6 hours. The phases were then separated and the organic phase was first washed with warm water and then filtered with the addition of activated carbon. Finally, distillation was carried out using a packed column with wire spirals. The distillation, carried out in a temperature range of from 72° C. to 74° C. at 0.25 mbar, yielded 106 g of 92% 2,2-dimethyl-3-(3,5-dimethylphenyl)-propionaldehyde.

Aufarbeitung

  1. additionwas added dropwise to
  2. additionthis pre-mix
  3. temperatureunder reflux for 6 hours
  4. customThe phases were then separated
  5. washthe organic phase was first washed with warm water
  6. filtrationfiltered with the addition of activated carbon
  7. distillationFinally, distillation
  8. distillationThe distillation
  9. customcarried out in a temperature range of from 72° C. to 74° C. at 0.25 mbar

Quellen und Nachweise

ORD-Eintrag
ord-f2ef4a85e9a04737bae7c8b6c5b234f1
Quelldatensatz
uspto-grants-1987_12
Patentnummer
US04710316

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