| Summary: | 碩士 === 靜宜大學 === 應用化學研究所 === 98 === Part 1.
A new chemodosimeter 1-(4-(4-trifluoromethyl phenyldiazenyl) phenyl)-3-(pyren-1-yl)thiourea (20) was prepared, and its chromogenic and fluorogenic behaviors toward various metal cations were investigated. Receptor 20 shows exclusive a response toward Hg2+ ion and also distinguished Hg2+ ion from other metal cations by color changes in DMSO aqueous solution (DMSO/H2O = 9/1, v/v). Additionally, receptor 20 also exhibited a pronounced Hg2+-induced fluorescence enhancement. Thus, the receptor 20 can be used as a colorimetric and fluorescent chemodosimeter for the determination of Hg2+ ion.
Part 2.
The passionvine mealybug, Planococcus minor is a serious pest of economically important crops in Taiwan. The effective control of this pest is limited by only using pesticides. Also the side effects such as the insect resistance, the pesticide residue and the environment contamination will be occurred. To avoid these side effects, the nontoxic sex pheromone of the passionvine mealybug is chosen instead.
The sex pheromone of Planococcus minor was identified as (E)-2-isopropyl-5-methyl-2, 4-hexadienyl acetate (1). The synthesis of this sex pheromone would produce two isomers in the products. This caused some difficulties and troublesome. On our hand, due to the high cost of the starting material and the low yield of the product, the development of a cost-effective, high yield and operationally simple synthetic approach is necessary.
In this report a series of new palladium reagents are used for the synthesis of the intermediate, 2-(5-Methylhex-4-en-2-ynyloxy)- tetrahydro -2H-pyran (8). In addition, the subsequent coupling reaction can also be successfully preceded by using FeCl3. This improved synthetic method can overcome the above limitations. Receutly, the effective control of this pest in the tests by using this pheromone is achieved. This indicates that the synthesized pheromone has strong attraetiveness for the passionvine mealybug.
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