Sulfuric Acid → HCID 90431901, compound

Participants

Reaction Steps

Under a nitrogen atmosphere, methyl magnesium bromide (0.97 mol/L tetrahydrofuran solution, 3.0 ml, 2.9 mmol) was placed into a 30-ml flask equipped with a stirring apparatus, a dropping funnel, and a thermometer. In the dropping funnel, 2-[(1R*,2S*)-1-methyl-2-(1-phenylethyl)cyclopropyl]acetaldehyde (a diastereomer mixture with a component ratio of 1:2, 0.20 g, 0.99 mmol) and tetrahydrofuran (1 ml) were placed, and added dropwise in 5 minutes, with the temperature kept at 20° C. At the same temperature, the mixture was stirred for 30 minutes. Next, a 5% aqueous sulfuric acid solution (2.9 g) was added. After stirring for 10 minutes, the aqueous layer was separated, and the organic layer was washed twice with water (2 ml). The solvent was recovered under reduced pressure to obtain a condensed residue. The results of a GC analysis showed that the condensed residue was a mixture of four isomers. This residue was purified by silica gel column chromatography (hexane:ethyl acetate=8:2). Thus, a component (0.016 g, 0.07 mmol, 7% yield) with the longest retention time in the GC analysis was obtained. Results of evaluation based on gas chromatography-olfactometry (GC-O) showed that this component was a component having the lowest odor threshold, among the 4 isomers.

Provenance & Evidence