5 results about "Methyl methoxyacetate" patented technology

The application discloses a method for modifying hydrogen type Y molecular sieve by ammonium fluoride and application of the hydrogen type Y molecular sieve in preparation of methyl methoxyacetate, and belongs to the field of catalytic chemistry. The modification method comprises the following steps: S1, hydrogen type Y molecular sieve is added into an ammonium fluoride aqueous solution, stirring reaction is carried out, filtration is carried out, and washing is carried out; S2, the filtered and washed molecular sieve is subjected to ammonium exchange; and S3, the ammonium exchanged molecular sieve is subjected to drying and calcination, so that the hydrogen type Y molecular sieve modified by the ammonium fluoride is obtained. The ammonium fluoride modified Y molecular sieve can fully open the six-membered ring window between SOD cages and supercages, is beneficial to exerting the carbonylation performance of the high-activity Bronsted acid in the SOD cage, and thus the selectivity and synthesis efficiency of the methyl methoxyacetate are improved. The method for modifying the Y molecular sieve by the ammonium fluoride can be rapidly realized at low temperature, and the carbonylation performance of the conventional Y or USY molecular sieve is significantly improved; the silicon-aluminum ratio changes little before and after treatment, and the product yield is high.

The application discloses 2-(2,5-dihydroxyphenyl)-2-methoxy methyl acetate as well as a preparation method and application thereof, and relates to the technical field of marine fungus active ingredient production and application. The application discloses that 2-(2,5-dihydroxyphenyl)-2-methoxy methyl acetate has good anti-UVB-induced HaCaT cell oxidative damage activity, and the compound has low cytotoxicity, and has good development prospects in the preparation of cosmetics, medicines and health products for resisting skin damage.

The invention discloses methyl 2-(2, 5-dihydroxyphenyl)-2-methoxyacetate as well as a preparation method and application thereof, and relates to the technical field of production and application of active ingredients of marine fungi. Research finds that methyl 2-(2, 5-dihydroxyphenyl)-2-methoxyacetate has a good effect of resisting UVB induced HaCaT cell oxidative damage activity, and the compound is low in cytotoxicity and has a good development prospect in the aspect of preparing cosmetics, medicines and health care products for resisting skin damage.

The invention relates to the technical field of compound synthesis, in particular to a preparation method of methyl methoxyacetate. According to the method, a membrane contact reactor is adopted, an ultrathin heteropolyacid-ionic liquid composite catalytic membrane is constructed on a membrane-liquid interface, and CO is supplied in a segmented distribution mode in the length direction of the reactor. According to the method, spectral signals of CO dissolved in a liquid phase are monitored on line, and the CO permeation flux of each section is controlled in a closed-loop manner, so that the ratio r (z) of on-way local CO partial pressure to DMM concentration is maintained in a region beneficial to carbonylation reaction, and side reactions such as disproportionation and rearrangement of DMM are inhibited. The selectivity and yield of MMAc are remarkably improved under the same average CO pressure, and byproducts such as dimethyl ether and methyl formate are remarkably reduced. The heteropolyacid catalyst is fixed on a membrane interface through the low-volatility ionic liquid, loss of the catalyst is effectively prevented, stable reuse of the catalyst is achieved, and the method is suitable for continuous operation and good in long-term stability.

The invention discloses a synthesis method of dimethyl malonate. The synthesis method comprises the following steps: methanol and methyl glycolate are subjected to a contact reaction with an etherification catalyst, an obtained product methyl methoxyacetate is subjected to a reaction with CO under the action of a carbonylation catalyst, and dimethyl malonate is obtained. According to the method disclosed by the invention, the dimethyl malonate is prepared through etherification-carbonylation two-step reaction, so that the utilization rate of the methyl glycolate and the yield of the dimethyl malonate are greatly improved.