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首页> 外文期刊>Journal of the Chilean Chemical Society >ELECTROPHILIC AND NUCLEOPHILIC CHEMICAL REACTIVITY OF NEUTRAL AND ANIONIC FORMS OF 4-CPA, 24D-CPA, 34-CPA AND 245T-CPA THROUGH CONCEPTUAL DFT REACTIVITY DESCRIPTORS
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ELECTROPHILIC AND NUCLEOPHILIC CHEMICAL REACTIVITY OF NEUTRAL AND ANIONIC FORMS OF 4-CPA, 24D-CPA, 34-CPA AND 245T-CPA THROUGH CONCEPTUAL DFT REACTIVITY DESCRIPTORS

机译:通过概念性DFT反应性描述器对4-CPA,24D-CPA,34-CPA和245T-CPA的中性和阴离子型的静电和核化学反应性

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In the present work, we have analyzed the electrophilic and nucleophilic chemical reactivity of the neutral and anionic chlorophenoxyacetic acid herbicides, 4-CPA, 24D-CPA, 34-CPA and 245T-CPA at the X/6-311++G(2d,2p) level of theory (where X= wB97XD, MPW91B1K and MP2). Chemical reactivity was analyzed in the aqueous phase and employing global and local DFT reactivity descriptors. The structural parameters derived from DFT calculations are equivalent to those obtained at the MP2 level. The Fukui Function values suggest that nucleophilic attacks to the neutral and anionic forms would cause dechlorination on 24D-CPA, 34-CPA and 245T-CPA and hydrogen abstraction in 4-CPA. At pH values lower than 2.7, electrophilic attacks would cause the cleavage of the ether bond in 4-CPA, 24D-CPA and 34-CPA and dechlorination in 245T-CPA. But, at pH 3.6, electrophiles may cleave the ether bond to start the degradation of the four CPAs.
机译:在目前的工作中,我们已经分析了X / 6-311 ++ G(2d)中性和阴离子型氯苯氧基乙酸除草剂4-CPA,24D-CPA,34-CPA和245T-CPA的亲电子和亲核化学反应性,2p)的理论水平(其中X = wB97XD,MPW91B1K和MP2)。在水相中分析化学反应性,并采用全局和局部DFT反应性描述符。从DFT计算得出的结构参数等于在MP2级别获得的结构参数。 Fukui函数值表明,对中性和阴离子形式的亲核攻击将导致24D-CPA,34-CPA和245T-CPA上的脱氯以及4-CPA中的氢提取。在pH值低于2.7时,亲电子攻击会导致4-CPA,24D-CPA和34-CPA中的醚键断裂以及245T-CPA中的脱氯作用。但是,在pH> 3.6时,亲电试剂可能会裂解醚键以开始降解四种CPA。

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