作者:M. Kimberly Painter、Hyung-Soo Choi、Kurt W. Hillig、Robert L. Kuczkowski
DOI:10.1039/p29860001025
日期:——
Styrene–benzaldehyde mixtures (unsubstituted and the p-nitro, p-chloro, and p-methyl systems) were ozonized in CDCl3 at 0 °C. The yields of styrene ozonide and of the two crossed ozonides (stilbene and ethylene ozonides) were determined. The cleavage direction ratios of the primary ozonides were also determined. In a computer simulation of the yields five rate expressions were employed, giving relative rate coefficient
苯乙烯-苯甲醛混合物(未取代的和对硝基,对氯和对甲基系统)在CDCl 3中臭氧化在0°C下。测定了苯乙烯臭氧化物和两种交叉的臭氧化物(二苯乙烯和乙烯臭氧化物)的产率。还确定了初级臭氧化物的裂解方向比率。在产率的计算机模拟中,采用了五个速率表达式,给出了有关羰基氧化物和醛之间的环加成反应的相对速率系数信息。臭氧分解过程中各种竞争反应的分析表明,吸电子取代基可通过增强羰基氧化物的偶极特性和醛的偶极亲和性来增加交叉的臭氧化物的形成。取代基还影响伯氮氧化物的裂解方向和溶剂笼效应。交叉的臭氧化物速率常数[ k(sti臭氧化物)/(k(乙烯臭氧化物)]的斜率(ρ)为1.4(0.1)。