Method for improving content of cis-methyl-dihydrojasmonate

Abstract

The invention discloses a method for improving the content of cis-methyl-dihydrojasmonate, which comprises the following steps: filling an object to be converted and a catalyst into a reactor, and putting the reactor into a microwave device; introducing nitrogen into the reactor and starting the microwave device; and after the reaction, introducing the reactants into ice water with a neutral pH value for quick cooling and standing layering, and drying an organic layer to obtain the product, wherein the object to be converted is cis-trans mixed methyl dihydrojasmonate isomer or trans-methyl-dihydrojasmonate, the catalyst is sodium carbonate, sodium sulfate, sodium chloride, calcium chloride, copper chloride or zinc chloride, the mass ratio of the object to be converted to the catalyst is 80-90:1, the microwave power is between 0.2 and 0.5 kW, the reaction time is between 2 and 10 minutes, the temperature of the ice water is less than 40 DEG C, and the drying agent used for drying the organic layer is anhydrous sodium sulfate, calcium chloride, or a 4A molecular sieve. The method improves the cis-content and shortens the conversion time, and as a higher cis-product, after dilution, the cis-methyl-dihydrojasmonate can be directly used for preparing an aromatic product, purifying the smell of the aromatic product and optimizing the product quality.

Description

technical field [0001] The invention relates to a method for increasing the content of spices in the perfume industry, in particular to a method for increasing the content of methyl cis-dihydrojasmonate. Background technique [0002] Jasmine is a kind of floral fragrance that people like, and methyldihydrojasmonate (Methyldihydrojasmonate CAS: 24851-98-7FEMA: 3408) has an elegant and soft jasmine fragrance and a comfortable lemon-like fruity fragrance. The whole fragrance is light Elegant, long-lasting fragrance, good fragrance effect, so it becomes one of the main compounds to prepare the characteristic aroma of jasmine. Since E. Demole and others separated methyl jasmonate from jasmine essential oil in the 1960s and hydrogenated it to obtain methyl dihydrojasmonate, Firmenich has successfully applied it in the famous perfume "EauSauvage" (Dior), And came out under the trade name of "Hedione", it has become one of the most consumed and most successful synthetic fragrances....

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Problems solved by technology

Comparing the above two aspects, although the former method has obtained a product with a high cis content, the catalyst used in the research is expensive, which makes the cost very high, and the price of the product obtained by synthesis is very expensive; although the latter method converts the trans to cis The yield of the cis-form is not very high, but because it is cheap and the product does not require a particularly high cis-content, it is still a research hotspot in the spice industry

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