2,3-Dimethyl-1,3-butadiene → HCID 12893794, compound

HRID 1156367Notes

Reaction equation

HRID 1156367 reaction equation
[CH3:1][C:2]([C:4]([CH3:6])=[CH2:5])=[CH2:3].[CH3:7][CH:8]([CH3:14])[CH2:9][C:10](=[O:13])[CH:11]=[CH2:12]>>[CH2:9]([C:10]([CH:11]1[CH2:12][CH2:5][C:4]([CH3:6])=[C:2]([CH3:1])[CH2:3]1)=[O:13])[CH:8]([CH3:14])[CH3:7]

Participants

3

Reactant 2

HCID 105662,3-Dimethyl-1,3-butadieneHCID 30140811-Hexen-3-one, 5-methyl-

Product 1

HCID 12893794HCID 12893794, compoundYield 77.8%

Procedure

45.3 g of 2,3-dimethylbutadiene are added to 47.5 g of 5-methyl-hex-1-en-3-one at initially 100° C., at a rate such that the temperature does not drop below 90° C. The mixture is then kept for 1 hour at 100° C. and 30 minutes at 115° C., the excess dimethylbutadiene is distilled off, and the residue is distilled under reduced pressure. 64 g of 3,4-dimethylcyclohex-3-en-1-yl isobutyl ketone, of boiling point 99°-101° C./3 mm Hg, are obtained.

Workup

  1. customdoes not drop below 90° C
  2. distillationthe excess dimethylbutadiene is distilled off
  3. distillationthe residue is distilled under reduced pressure

Sources & evidence

ORD record
ord-00909f9c705347e486305b05a671a741
Source dataset
uspto-grants-1982_06
Patent number
US04335138

Reaction notes

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