Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 2,3,5-Trichloropyridin-4-ol, is researched, Molecular C5H2Cl3NO, CAS is 1970-40-7, about Selectivity of pyriclor [2,3,5-trichloro-4-pyridinol] on witchweed, tobacco, and other plants.Electric Literature of C5H2Cl3NO.
Postemergence directed application of 0.56 kg/ha of 2,3,5-trichloro-4-pyridinol (pyriclor) gave control of Striga lutea (witchweed) equivalent to 2.24 kg/ha of 2,4-D without injuring Zea mays (corn). Pyriclor applied to the soil surface or incorporated did not significantly injure Nicotiana tabacum (tobacco) at rates of 2.24 kg/ha and less. Arachis hypogaea (peanut) was not injured by pyriclor incorporated in soil at 0.56 kg/ha; Solanum tuberosum (potato) was slightly injured. Treatment with 0.56 kg/ha of pyriclor applied in the same manner killed 6 crop species and 4 weed species also included in the experiment In 2 years of field experiments, application of pyriclor at 0.21 and 0.63 kg/ha to soil before transplanting, or these rates applied over the top of tobacco after transplanting, controlled large crabgrass (Digitaria sanguinalis) until maturity of the tobacco, and did not significantly reduce yield or cause permanent injury to the crop.
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Reference:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem