Water → HCID 178448077, Verbindung

HRID 2254932Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 2254932
[CH2:1]([CH:4]1[CH2:9][CH2:8][CH:7]([CH:10]([CH2:13][OH:14])[CH2:11][OH:12])[CH2:6][CH2:5]1)[CH2:2][CH3:3].[F:15][C:16]1[CH:17]=[C:18]([CH:21]=[CH:22][C:23]=1[F:24])[CH:19]=O.CC1C=CC(S(O)(=O)=O)=CC=1.O>ClCCl>[F:15][C:16]1[CH:17]=[C:18]([C@H:19]2[O:12][CH2:11][C@H:10]([C@H:7]3[CH2:8][CH2:9][C@H:4]([CH2:1][CH2:2][CH3:3])[CH2:5][CH2:6]3)[CH2:13][O:14]2)[CH:21]=[CH:22][C:23]=1[F:24]

Komponenten

6

Edukt 4

HCID 962WaterHCID 6101p-Toluenesulfonic acidHCID 5880883,4-DifluorobenzaldehydeHCID 112294182-(4-Propylcyclohexyl)propane-1,3-diol

Produkt 1

HCID 178448077HCID 178448077, VerbindungAusbeute 62,5 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

In 40 cm3 of dichloromethane, 1.5 g (0.008 mol) of 2-(4'-propylcyclohexyl)propane-1,3-diol, 1.5 g (0.01 mol) of 3,4-difluorobenzaldehyde (manufactured by Aldrich), and 0.1 g of TsOH were refluxed for 3 hours over a hot water bath fitted with a Dean-Stark trap and the water formed was removed continuously from the reaction system. The reaction solution was washed with water and the dichloromethane was distilled off. The distillation residue was recrystallized from a solvent mixture of acetone and methanol to yield 1.6 g (0.005 mol) of trans-2-(3',4'-difluorophenyl)-5-(trans-4'-propylcyclohexyl)-1,3-dioxane. The phase transition points, measured by DSC, were: ##STR31## wherein C is the crystal phase, N is the nematic phase and I is the isotropic liquid phase.

Aufarbeitung

  1. customfitted with a Dean-Stark trap
  2. customwas removed continuously from the reaction system
  3. washThe reaction solution was washed with water
  4. distillationthe dichloromethane was distilled off
  5. customThe distillation residue was recrystallized from a solvent mixture of acetone and methanol

Quellen und Nachweise

ORD-Eintrag
ord-dfd4427bed2a4e64ad9bc63e058c39cc
Quelldatensatz
uspto-grants-1993_08
Patentnummer
US05238599

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