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.
ASYMMETRIC ORGANIC PEROXIDE, CROSSLINKING AGENT COMPRISING THE SAME, AND METHOD OF CROSSLINKING WITH THE SAME
申请人:NOF CORPORATION
公开号:EP1233014A1
公开(公告)日:2002-08-21
A crosslinking agent comprising an asymmetry organic peroxide having at least one structure unit of (substituted)benzoylcarbonyloxy group represented by the following formula (1) in the molecule thereof.
Environmentally friendly crosslinking agents and crosslinked silicone rubber moldings are provided thereby.
Specifically, useful crosslinking agents and crosslinking processes for silicone rubber are provided.
Copper-catalyzed S-methylation of sulfonyl hydrazides with TBHP for the synthesis of methyl sulfones in water
作者:Yu Yang、Yajie Bao、Qianqian Guan、Qi Sun、Zhenggen Zha、Zhiyong Wang
DOI:10.1039/c6gc03142k
日期:——
A copper-catalyzed S-methylation of sulfonyl hydrazides with TBHP was efficiently developed, providing a variety of methylsulfones with good to excellent yields. The reaction can be carried out in water...
A convenient and general preparation of alkyl hydroperoxides and dialkyl peroxides
作者:Peter G. Cookson、Alwyn G. Davies、Brian P. Roberts
DOI:10.1039/c39760001022
日期:——
Primary, secondary, and tertiary alkylhydroperoxides and dialkyl peroxides can be prepared from the appropriate alkyl bromide or iodide and hydrogen peroxide or alkylhydroperoxide in the presence of silver trifluoroacetate.
Thermal Decomposition Mechanisms of <i>tert</i>-Alkyl Peroxypivalates Studied by the Nitroxide Radical Trapping Technique
作者:Tomoyuki Nakamura、W. Ken Busfield、Ian D. Jenkins、Ezio Rizzardo、San H. Thang、Shuji Suyama
DOI:10.1021/jo990680s
日期:2000.1.1
mechanism involving concerted two-bond scission within the solvent cage to generate the tert-butyl radical, CO(2), and an alkoxyl radical. The thermolysis rateconstants of tert-alkyl peroxypivalates 1 were influenced by both inductive and stericeffects [Taft-Ingold equation, log(rel k(d)) = (0.97 +/- 0. 14)Sigmasigma - (0.31 +/- 0.04)SigmaE(s)(c), was obtained].