Sulfuric Acid → 3-(5,5-Dimethyl-1,3-dioxan-2-yl)-1-(3,4-dimethylphenyl)butan-1-one

HRID 348504

Reaktionsgleichung

Br[CH2:2][C:3]([C:5]1[CH:10]=[CH:9][C:8]([CH3:11])=[C:7]([CH3:12])[CH:6]=1)=[O:4].[CH3:13][CH:14](C)[CH2:15]N(C=CC)CC(C)C.[OH:25][CH2:26][C:27]([CH3:31])([CH2:29][OH:30])[CH3:28].S(=O)(=O)(O)O>O.CN(C)C=O>[CH3:28][C:27]1([CH3:31])[CH2:29][O:30][CH:13]([CH:14]([CH3:15])[CH2:2][C:3]([C:5]2[CH:10]=[CH:9][C:8]([CH3:11])=[C:7]([CH3:12])[CH:6]=2)=[O:4])[O:25][CH2:26]1

Komponenten

Reaktionsbedingungen

Temperatur: 50 °C

Versuchsvorschrift

2-Bromo-1-(3,4-dimethylphenyl)ethan-1-one (220 g) and N,N-bis(2-methylpropyl)-1-propenylamine (249 g) were added to 990 ml of dimethylformamide under an atmosphere of nitrogen and the mixture was stirred at around 50° C. for 2 hours. After cooling the reaction mixture to 10° C., 990 ml of water, 170 g of neopentyl glycol and 173 g of concentrated sulfuric acid were added successively to the reaction mixture and the mixture was stirred at around 60° C. for 2 hours. After cooling the reaction mixture to the room temperature, crystals precipitated. These crystals were isolated by filtration to give 262 g (yield 83%) of the title compound as white crystals.

Aufarbeitung

temperatureAfter cooling the reaction mixture to 10° C.
stirringthe mixture was stirred at around 60° C. for 2 hours
temperatureAfter cooling the reaction mixture to the room temperature, crystals
customprecipitated
customThese crystals were isolated by filtration

Quellen und Nachweise

ORD-Eintrag: ord-804b895d81014454adfcee1577a9ae10
Quelldatensatz: uspto-grants-2007_02
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US07176323B2

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