Citronellic acid → 3,7-Dimethylocta-2,6-dienoic acid
Reaction equation
[CH3:1][CH:2]([CH2:7][CH2:8][CH:9]=[C:10]([CH3:12])[CH3:11])[CH2:3][C:4]([OH:6])=[O:5]>C(Cl)(Cl)Cl>[CH3:1][C:2]([CH2:7][CH2:8][CH:9]=[C:10]([CH3:12])[CH3:11])=[CH:3][C:4]([OH:6])=[O:5]Participants
Reactant 1
Product 1
Reagents, catalysts & solvents 1
Procedure
Following the procedure of Example 8, with the exception of using a substrate/catalyst ratio of 15, the hydrogenation of 3,7-dimethylocta-2,6-dienoic acid (E/Z≃7) was carried out at -23° C. under 130 psig of H2. The reaction was stopped after one week and there was obtained 1.41g. (94% yield) of a mixture of 65% 3,7-dimethyloct-6-enoic acid and 35% 3,7-dimethylocta-2,6-dienoic acid. The rotation of this mixture was [α]D25 +4.59° (c. 5.04, CHCl3) and of the methyl ester was [α]D25 +3.05° (c. 5.08, CHCl3). The nmr of the ester showed a 6:1 ratio of R to S enantiomers in the 3,7-dimethyloct-6-enoic acid. The optical purity calculated from the rotation of the acid is 69%, and the enantiomeric excess determined from the nmr of the ester is 71%.
Sources & evidence
- ORD record
- ord-07dac76935c94ebcaec5a0324cfae4b5
- Source dataset
- uspto-grants-1978_09
- Patent number
- US04115417
Reaction notes
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