isothiocyanates, carbodiimides, carbon disulfide, and carbon dioxide with carbanions or enamines (reference nucleophiles) have been measured photometrically in acetonitrile or DMSO solution at 20 °C. The resulting second-order rate constants and the previously published reactivity parameters N and sN of the reference nucleophiles were substituted into the correlation log k2(20 °C) = sN(N + E) to determine the
异氰酸酯、异
硫氰酸酯、碳二
亚胺、
二硫化碳和
二氧化碳与碳负离子或烯胺(参考亲核试剂)的反应动力学已在 20 °C 下在
乙腈或
DMSO 溶液中进行光度测量。将所得的二阶速率常数和先前公布的参考亲核试剂的反应性参数 N 和 sN 代入相关性 log k2(20 °C) = sN(N + E) 以确定杂烯的亲电性参数:TsNCO ( E = -7.69) ≫ PhNCO (E = -15.38) > CS2 (E = -17.70) ≈ Ph
NCS (E = -18.15) > PhNCNPh (E = -20.14) ≫ CyNCNCy (E ≈ -30)。可以推导出
CO2 的近似值 (-16 < E < - 11)。量子化学计算在 IEFPCM(DMSO)/B3LYP-D3/6-311+G(d, p) 理论
水平并与实验吉布斯激活能进行比较。畸变相互作用模型用于合理化 O-和 S-取代的杂丙