Kinetics of the reactions of bissulfonylethylenes with various carbanions, a sulfur ylide, and siloxyalkenes have been investigated photometrically at 20 °C. The second‐order rate constants have been combined with the known nucleophile‐ specific parameters N and sN for the nucleophiles to calculate the empirical electrophilicity parameters E of bissulfonylethylenes according to the linear free energy
双磺酰基乙烯与各种碳负离子,硫叶立德和甲硅烷氧基烯烃的反应动力学已在20°C下进行了光度法研究。将二阶速率常数与亲核试剂的已知亲核试剂特定参数N和s N相结合,以根据线性自由能关系log k(20°C)= s N计算双磺酰基乙烯的经验亲电参数E(N + E)。讨论了结构-反应关系,并表明亲电参数E 这项工作中衍生的衍生物可用于定义双磺酰基乙烯作为Michael受体的合成潜力。
1,1-Bis(benzenesulfonyl)ethylene: a useful synthon for neutral homologation of ketones
作者:De Lucchi Ottorino、Pasquato Lucia、Modena Giorgio
DOI:10.1016/s0040-4039(01)91098-6
日期:1984.1
1,1-Bis(benzenesulfonyl)ethylene (1) is a versatile building block in organic synthesis since it reacts under neutral conditions with enolizable ketones to afford adducts that can be subjected to a variety of synthetic transformations.