Font Size: a A A

Synthesis The Sex Pheromone Of Dichocrocis Puncticralis G. And Studys On Its Bio-Activity

Posted on:2008-02-06Degree:MasterType:Thesis
Country:ChinaCandidate:W SongFull Text:PDF
GTID:2143360215494519Subject:Pesticides
Abstract/Summary:PDF Full Text Request
Many insects communicate with each other to feed themselves,to orientate themselves and to mate by releasing chemical information compounds.Those compounds which are released by insects in their sex mature age in order to attract other opposite sex inscets are called insect sex pheromones.Acrroding to sex pheromones's characteristic,the sex pheromones synthesized by people are called sex attractants. Sex attractants have become one of the new biopesticide which are concerned by more and more people because they don't pulution environment and bring no harms to people and other animals.Dichocrocis puncticralis Guenee is one of the polyphagia pest which can do badly harm to apple,peach,pear, Chinese chestnut and other crops. This paper has discussed the methods of synthesis the sex pheromone of Dichocrocis puncticralis on the base of other researchers,and also primarily studied the application of the synthesized sex pheromone in fields in order to provide a basis for further theoretical study to control the pest with bio-method. The main results and conclusion are as follows:1.A successful synthesis route of the sex pheromones of Dichocrocis puncticralis was set up in four steps as following:a.Discussed the methods of synthesis the Z/E-10-Hexadecnyl with Wittig reaction from Ylide in the reagent of THF and DMSO with n-BuLi and methylsulfinyl carbanion-dimethyl sulfoxide when temperatures are 0℃and 15~20℃with synthesis route above.As a result,we have found that the more successful reaction condition of synthesis the Z/E-10-Hexadecnyl is that in the reagent of DMSO with methylsulfinyl carbanion-dimethyl sulfoxide when temperature is 15~20℃. b.The target molecular(TM) was synthesized with the raw material of 1,10-Decanediol and Capronaldehyd through selectiveω-monobromination reaction, Ylide reaction,Wittig reaction and Oxidation reaction.The yield ratio is about 30%, and the TM was identifyIed by IR,GC-MS and ~1H NMR methods.The results showed that the compound was the Dichocrocis puncticralis G's sex pheromones (Z/E-10-Hexadecenal).Also the GC analysised results indicated that the TM contained 96% higher purity, and its ratios of Z/E are 20/80.2.The synthesized sex pheromone carried by natural rubber baits was investigated its biological activity under dosages of 25,50,100,250 and 500μg in every bait.The results showed that the sex pheromones has the better attractive activity than other dosages when its dosage is 50μg every bait.3. We investigated the attractive activity of the mixture of Z/E-10-Hexadecenal and Z/E-10-Hexadecnyl acetate in field test when their dosages ratios were 20μg︰80μg,50μg︰50μg,80μg︰20μg in every bait.The results showed that the attrative effects of mixture doses hadn't improved more than single dosage..4. We determined the release rates of sex pheromone of Dichocrocis puncticralis G. in filed test in whole test date when its dosages are 1mg in every bait.The results showed that the mean release rates of sex pheromone was 30.0μg/d.The above results showed that the synthesis route was successful in this paper,and the synthesized sex pheromone of Dichocrocis puncticralis has better attractive effect in field.
Keywords/Search Tags:Dichocrocis puncticralis G., Sex pheromone, Wittig reaction, attractive effect
PDF Full Text Request
Related items