Potassium Hydroxide → 3-Methyl-5-(2,2,3-trimethylcyclopent-3-en-1-yl)pentan-2-ol

HRID 972168Notes

Reaction equation

HRID 972168 reaction equation
[CH3:1][C:2](=[CH:6][CH2:7][CH:8]1[CH2:12][CH:11]=[C:10]([CH3:13])[C:9]1([CH3:15])[CH3:14])[C:3](=[O:5])[CH3:4].[OH-].[K+].[H][H]>[Cr]([O-])([O-])=O.[Cu+2].C(O)(CC)C>[CH3:1][CH:2]([CH2:6][CH2:7][CH:8]1[CH2:12][CH:11]=[C:10]([CH3:13])[C:9]1([CH3:15])[CH3:14])[CH:3]([OH:5])[CH3:4]

Participants

6

Reactant 3

HCID 14797Potassium HydroxideHCID 1032103-Penten-2-one, 3-methyl-5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-HCID 178418361HCID 178418361, compound2×

Product 1

HCID 1032123-Methyl-5-(2,2,3-trimethylcyclopent-3-en-1-yl)pentan-2-ol

Reagents, catalysts & solvents 2

HCID 178505374HCID 178505374, compoundCatalystHCID 6568(+-)-2-ButanolSolvent

Procedure

Into a one-liter stainless steel autoclave was charged 350 g (1.7 moles) of 3-methyl-5-(2,2,3-trimethylcyclopent-3-en-1-yl)pent-3-en-2-one, 26.3 g (7.5 wgt-%) of copper chromite, 0.1 g (0.03 wgt-%) of potassium hydroxide and 250 ml of sec.-butyl alcohol. The mixture was stirred and heated to 160° C under 300 psi hydrogen pressure and was hydrogenated until the hydrogen uptake ceased. The mixture was cooled to ambient temperature. The autoclave was vented and then the reaction mixture removed and filtered through a thin pad of Filter-cel®. The solvent was removed from the filtrate by distillation to a pot temperature of 75° C at 10-15 mm. The residual viscous oil was fractionally distilled to give 3-methyl-5-(2,2,3-trimethylcyclopent-3-en-1-yl)pentan-2-ol (a mixture of diastereomers). Yield 310 g (87% theory); bp 103°-106° C (1.0 mm); nD20 1.4730; mol wt. 210 (ms); nmr, 0.5δ, 0.8, 0.9 and 1.0 (6H, 4s, geminal dimethyl groups of the various diastereomers in the mixture), 1.0-1.1 (3H, d, buried under the CH3 singlets), 1.12 and 1.15 (3H, 2d, J=6.5 Hz, carbinol methyl groups of the various diastereomers in the mixture), 1.2-1.5 (6H, broad complex), 1.6 (3H, broad s, olefinic CH3), 1.7 (1H, s, hydroxyl H/exchanged by D2O, 1.8-2.4 (2H, broad complex, allylic methylene), 3.7 (1H, broad multiplet, carbinyl H), 5.2 (1H, broad multiplet, olefinic H); ir, 3360, 3040, 790 cm-1.

Workup

  1. customthe reaction mixture removed
  2. filtrationfiltered through a thin pad
  3. filtrationof Filter-cel®
  4. customThe solvent was removed from the filtrate by distillation to a pot temperature of 75° C at 10-15 mm
  5. distillationThe residual viscous oil was fractionally distilled

Sources & evidence

ORD record
ord-5ac6ff5086454bf6bb2bf061ed90191d
Source dataset
uspto-grants-1977_10
Patent number
US04052341

Reaction notes

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