Illiberis ulmivora Graeser sex attractant and preparation method thereof

Abstract

The invention provides an Illiberis ulmivora Graeser sex attractant, which comprises cis-7-dodecenoic acid-2-butyl ester and cis-9-tetradecenoic acid-2-butyl ester. The invention also provides a preparation method of the Illiberis ulmivora Graeser sex attractant, which comprises the steps of reducing pimelic acid and azelaic acid into 7-hydroxyheptanoic acid through lithium aluminum hydride, brominating the 7-hydroxyheptanoic acid, performing acylating chlorination on the 7-hydroxyheptanoic acid and thionyl chloride, esterifying the 7-hydroxyheptanoic acid and the thionyl chloride with sec-butyl alcohol to form 7-bromoheptanoic acid-2-butanol ester and 9-bromononanoic acid-2-butanol ester, preparing corresponding phosphine salt from the 7-bromoheptanoic acid-2-butanol ester and the 9-bromononanoic acid-2-butanol ester and triphenylphosphine, and then carrying out wittig reaction with n-valeraldehyde to synthesize a target compound. According to the Illiberis ulmivora Graeser sex attractant and the preparation method thereof, raw materials are easy to obtain, operation is easy and convenient, the cost is low, the product yield is high, the technological process is short, synthesis reaction conditions are mild, no danger exists, the product is easy to separate, for the stereoisomerization problem, unstable phosphorus ylide reacts with fatty aldehyde, the product is mainly cis-olefin, the yield is 90% or above, the stable phosphorus ylide reacts with fatty aldehyde, and the product is mainly trans-olefin.

Description

technical field [0001] The invention belongs to the field of pest control, and in particular relates to a sex attractant for the elm moth and a preparation method thereof. Background technique [0002] Illiberis ulmivora Graeser (Lepidoptera: Zygaeodae), whose larvae are also known as ulm star caterpillars, is an important leaf-eating pest of elm trees, with a single feeding habit and one generation per year. Juvenile larvae gather, disperse after the 3rd instar, nibble along the edge of the leaves and leave only the main veins, some leaves are all eaten up, when the leaves are eaten up, the larvae crawl along the trunk, or spin and droop with the wind and move to The damage continues on neighboring trees. When the damage is serious, the leaves can be eaten up, which not only affects the growth of the elm tree, weakens the tree, and even makes the branches dry and the whole plant dies when it is serious. In 2018, the elm moth occurred in the northern section of Helan Mount...

AI Technical Summary

Problems solved by technology

Pesticide control will cause insects to gradually develop resistance after multiple iterations, and the effect will be greatly reduced. At the same time, it will accidentally injure other types of insects, pollute the environment, and destroy the ecological balance to a certain extent.

Images