• effect of reactants’ concentration on the ratio and yield of e,z isomers of isatin-3-(4-phenyl)semicarbazone and n-methylisatin-3-(4-phenyl)semicarbazone

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 915
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     in this work, the effect of inter- and intramolecular interactions of reactants and products, reactants concentration as well as the solvent effect on the ratio of e and z isomers of isatinphenylsemicarbazones in the reaction mixture is examined. theoretical calculations proved that z isomers are more stable than e isomers. experimental results confirmed the noncovalent intermolecular donor-acceptor interactions of the reactants in the reaction mixture at concentrations above 0.1 mol l−1. the e/z isomer ratio of isatin-3-(4-phenyl)semicarbazone (i) and n-methylisatin-3-(4-phenyl)semicarbazone (ii) depends on the initial concentrations of 3-amino-1-phenylurea (phenylsemicarbazide; v) and 1h-indole-2,3-dione (isatin; iii), or 3-methylindol-2,3(1h)-dion (3-methylisatin; iv), respectively. both isomers exhibit high thermal stability. thermal e-z isomerization takes place at temperatures above 70°c in n,n-dimethylformamide.

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