EXPERIMENTAL AND THEORETICAL STUDY OF STABLE PHOSPHORUS YLIDES DERIVED FROM INDAZOLE IN THE PRESENCE OF DIFFERENT DIALKYL ACETYELENEDICARBOXYLATES: FURTHER INSIGHTS INTO THE REACTION MECHANISM

Journal of The Chilean Chemical Society

ZAKARIANEZHAD, MOHAMMAD¹  SHOOL, MOTAHARE¹  MAKIABADI, BATOUL² 

[1] Payam Noor University, Tehran, Iran;Sirjan University of Technology, Sirjan, Iran

关键词: NH-;    acid;    Kinetic investigation;    Theoretical study;    Z-;    and E-;    rotamers;    Indazole;    Triphenylphosphine;   

DOI  :  10.4067/S0717-97072016000200016

学科分类：化学（综合）

来源: Sociedad Chilena de Quimica

【 摘 要 】

In the recent work, kinetics studies were made of the reactions between triphenylphosphine 1, dialkyl acetylenedicarboxylates 2 in the presence of NH-acid, such as indazole 3. The kinetic parameters of all reactions determined by UV spectrophotometry. The second order fits were drawn and the values of the second order rate constant (k) were calculated using standard equations. All reactions repeated at different solvents and temperatures. Furthermore, useful information was obtained from studies of the effect of solvent, the structure of the reactants (dialkyl acetylenedicarboxylates) and also the concentration of reactants on the reaction rates. Theoretical studies were performed for evaluation of potential energy surfaces of all structures participated in the reaction mechanism. The first step of all reactions was recognized as a rate-determining step in the reaction mechanism, on the basis of experimental and theoretical data. Theoretical studies performed for evaluation of potential energy surfaces of all structures participated in the reaction mechanism. Quantum mechanical calculations were clarified that how the ylides exist, in solution, as a mixture of two geometrical Z- and E-isomers as a minor or major form.

【 授权许可】

Unknown