Synthesis of Alkyl 2-(1-t-Butylperoxyalkyl)propenoates and Ethyl 2-t-Butylperoxymethylbut-2-enoate
摘要:
Methods of synthesis of alkyl 2-(1-t-butylperoxyalkyl)propenoates and ethyl 2-t-butylperoxymethylbut-2-enoate are developped through the nucleophilic substitution of t-butylperoxylate anion towards various allylic derivatives prepared from alkyl 2-hydroxymethylalk-2-enoates and ethyl 2-(1-hydroxyethyl)propenoate.
Synthesis of methacrylic-type peroxidic compounds and study of their homolytic induced decomposition in solution
作者:Daniel Colombani
DOI:10.1016/s0040-4020(96)01180-5
日期:1997.2
unsaturated peroxidic compounds have been prepared, characterized and inductively decomposed in various solvents to afford the corresponding oxiranes. The reaction proceeded by a radical chain mechanism and was initiated either by thermolysis of added t-butyl peracetate at 110°C or AIBN at 80°C, or by autoxidation of BEt3 at 20°C. The studied peroxyderivatives were designed to generate oxyl radicals reacting
Abstract Addition of potassium hydroxide to a THF solution of an alkyl hydroperoxide and an allylic peroxide having an electron-poor double bond yielded the formation of epoxyperoxide. Such a heterocycle was generated via the. Michael addition of the peroxylate to the activated double bond of the unsaturated peroxide followed by an SNI at the O-O bond.
The treatment of a beta,gamma-unsaturated peroxide, containing an electron-deficient double bond, by a carbanion Z(-) led to the transformation of the compound by a process involving the addition of the carbanion to the double bond, followed by an S(N)i reaction on the peroxidic bond, with the liberation of an alkoxylate anion. When the carbanion was regenerated by proton abstraction from a ZH substrate
Treatment of 2-ethoxycarbonylprop-2-enyl peroxides with potassium alkylperoxylate, the sodium enolate of diethyl malonate and a primary or secondary amine yields epoxides via a two-step process: (i) addition of the nucleophile to the acrylic unsaturated bond and (ii) intramolecular anionic substitution on the peroxidic bond.
Stereoselectivity of the intramolecular homolytic substitution in the induced decomposition of methacrylic-type peroxidic compounds
作者:Daniel Colombani、Bernard Maillard
DOI:10.1016/0040-4020(96)00914-3
日期:1996.11
The stereochemistry of the oxiranes, obtained by radical induced decomposition of various peroxydic compounds, was determined by NMR spectroscopy. The stereoselectivity of the intramolecular homolytic substitution on the peroxidicbond was discussed in relation to the effect of the reaction temperature and on the influence of structural factors such as the nature of the leaving and attacking radicals