33 results about "Tetronic acid" patented technology

The invention discloses a synthetic method of tetronic acid. The synthetic method comprises the following steps: firstly oxidizing low-price easily-available natural sodium D-isoascorbate as a raw material through hydrogen peroxide, and acidifying through hydrochloric acid to prepare a key synthetic intermediate, namely erythronolactone; secondly, reacting erythronolactone with sulfonyl chloride to generate crude tetronic acid; finally, simply re-crystallizing obtained crude tetronic acid to obtain pure tetronic acid. The synthetic method has the characteristics of few synthetic steps, simple and convenient process, low synthetic cost, convenience for large-scale industrialized production and the like; finally obtained pure tetronic acid is high in yield and purity, the yield can reach more than 87%, and the purity can reach more than 99%.

The invention discloses an insecticidal composition containing pyrimethan and tetronic acid insecticides, the effective active ingredient of which is the first active ingredient pyrimidan and the second active ingredient selected from tetronic acid insecticides For the spirodiclofen, spiromethin or spirotetramat, the weight ratio of the first active ingredient to the second active ingredient is 1:10-10:1. The composition can be formulated into agriculturally acceptable suspensions, wettable powders, water-dispersible granules or dispersible oil suspensions. The composition of the invention is reasonable, the insecticidal effect is good, and its activity and insecticidal effect are not a simple superposition of the activities of each component. Compared with the existing single preparation, it not only has a significant insecticidal effect, but also has a significant increase. Efficacy, good safety for crops. The invention has remarkable control effect on citrus spider mite and cotton spider mite.

The invention discloses a synthetic method of a spirocyclic tetronic acid compound key intermediate. The method comprises the following steps of: mixing a substituted phenylacetic acid compound (I) with a compound (II); heating the mixture to 50-150 DEG C; adding a carboxylic acid activation reagent; preserving heat at the temperature 50-150 DEG C and reacting fully; and performing post-treatmentto obtain a spirocyclic tetronic acid compound key intermediate compound (III). The invention has the advantages that: (1) an acylation reaction is completed at one step in the preparation method, the reaction time is short, the raw material utilization ratio is high, and the energy consumption and the environmental pressure are lowered; (2) in the preparation method, the costs of raw materials are low, and an acid-binding agent or a catalyst is not invested additionally; and (3) the preparation method has a simple process, a small quantity of side reactions and high yield, and is suitable for large-scale industrial production.