Chrysanthemic acid, cis-(-)- → Chrysanthemic Acid

HRID 1198858Notes

Reaction equation

HRID 1198858 reaction equation
[CH3:1][C:2]([CH3:12])=[CH:3][C@H:4]1[C:6]([CH3:8])([CH3:7])[C@H:5]1[C:9]([OH:11])=[O:10].B(Br)(Br)Br>C1(C)C=CC=CC=1>[CH3:1][C:2]([CH3:12])=[CH:3][CH:4]1[C:6]([CH3:7])([CH3:8])[CH:5]1[C:9]([OH:11])=[O:10]

Participants

4

Reactant 2

HCID 20755Chrysanthemic acid, cis-(-)-HCID 25134Boron tribromide

Product 1

HCID 2743Chrysanthemic AcidYield 99%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent2×

Procedure

To a solution of cis chrysanthemic acid (2.0 g) in toluene (18 ml) was added a solution of boron tribromide (13 mg) in toluene (2.2 ml) at room temperature under a nitrogen atmosphere. Irradiation with a high pressure mercury lamp (100 W) was made for 10 minutes under stirring. After the reaction was over, similar after-treatment as in Example 1 was applied to obtain chrysanthemic acid (1.98 g). A part of the reaction solution was converted to ethyl ester. Gas chromatography assay gave the isomer ratio of the product: cis, 6.8%; and trans, 93.2%.

Workup

  1. customIrradiation with a high pressure mercury lamp (100 W)

Sources & evidence

ORD record
ord-5f87dc46d4ba4d3f90d383ea1ee2e3c1
Source dataset
uspto-grants-1990_02
Patent number
US04898655

Reaction notes

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