进行了一系列环取代的枯基氧基自由基的光谱性质和β-断裂反应的激光闪光光解研究。所有的枯基羟自由基在光谱的可见光区域均显示出较宽的吸收带,并在微秒级时域衰减,从而导致光谱的UV区域的吸收度显着增加,这归因于在β-切断枯基氧基。在给电子环取代基的存在下可见吸收带的位置发生红移,而在吸电子环取代基的存在下观察到蓝移,这表明+ R环取代基通过稳定初始自由基两性离子的芳环上的部分正电荷来促进被激发的枯基氧基中的电荷分离。沿着这条线,在枯基氧基的可见光吸收最大值处的实验测量的能量与sigma(+)取代基常数之间获得了极好的Hammett型相关性。对于所有枯基氧基,从MeCN到MeCN / H(2)O也会观察到红移,这表明水具有特定的作用。环取代不会显着影响枯基氧基自由基β断裂的速率常数,该常数在7.1 x 10(5)和1.1 x 10(6)s(-1)之间变化,这一结果表明,枯基氧基自由基β-断裂不受所得苯乙酮稳定性的支配。
Steric and electronic substituent effects in tertiary alkyl peroxide decompositions
作者:William H. Hendrickson、Chi C. Nguyen、Jackie T. Nguyen、Kim T. Simons
DOI:10.1016/0040-4039(95)01534-o
日期:1995.10
Rate constants for the homolysis of aryl- substituted α-cumyl tert-butyl peroxides (X-PhCMe2OOCMe3) produce a Hammett plot with a ρ value of −0.22±.04. Both steric and electronic parameters influence the decomposition rate constants of tertiary alkyl peroxides with bulky substituents: log krel = (−0.40±08)Σσ* −(0.43±.02)ΣEcs.
Golf ball cores formed from unsaturated organic imide co-curing agents
申请人:——
公开号:US20040230007A1
公开(公告)日:2004-11-18
A golf ball comprising a core formed from a composition comprising a metal salt of an unsaturated organic acid and at least one co-curing agent comprising an unsaturated imide or a metallic derivatives thereof; and a cover layer.
VILENSKAYA M. R.; PETROVSKAYA G. A.; POXMURSKAYA M. V., ZH. ORGAN. XIMII, 1981, 17, HO 5, 959-961
作者:VILENSKAYA M. R.、 PETROVSKAYA G. A.、 POXMURSKAYA M. V.
DOI:——
日期:——
Use of halogenated organosulfur and peroxide compounds in golf balls
申请人:——
公开号:US20030207998A1
公开(公告)日:2003-11-06
A golf ball comprising a core comprising a metal salt of an unsaturated organic acid and a halogenated organosulfur compound or a metal salt thereof, and a cover; wherein the metal salt of an unsaturated organic acid is present in an amount of less than about 20 pph and the halogenated organosulfur compound or a metal salt thereof is present in an amount of less than about 2 pph.