Intramolecular Homolytic Displacements. 24. Simple Access to Glycidic Esters via Induced Decomposition of Peroxyketals Derived from Ethyl 2-(1-Hydroperoxyethyl)propenoate
摘要:
The synthetic potential of the homolytic-induced decomposition of peroxyketals peroxyketals derived from ethyl 2-(1-hydroperoxyethyl)propenoate to access glycidic esters was demonstrated. The propagation step of this free radical chain reaction proceeds via the addition of an alkyl radical to the double bond followed by S(H)i on the peroxidic bond with the production of an oxy radical, regenerating rapidly by beta-elimination the alkyl radical responsible for the induced reaction, These reactions of elimination produce two fragments, an alkyl radical and an ester molecule, from linear ''acetalic'' radical, or they could be isomerizations in the case of cyclanyloxy radicals. In these last cases, the isomerization creates an ester function corresponding to a new protected functionality as aldehyde, acid, or alcohol.
Intramolecular Homolytic Displacements. 24. Simple Access to Glycidic Esters via Induced Decomposition of Peroxyketals Derived from Ethyl 2-(1-Hydroperoxyethyl)propenoate
摘要:
The synthetic potential of the homolytic-induced decomposition of peroxyketals peroxyketals derived from ethyl 2-(1-hydroperoxyethyl)propenoate to access glycidic esters was demonstrated. The propagation step of this free radical chain reaction proceeds via the addition of an alkyl radical to the double bond followed by S(H)i on the peroxidic bond with the production of an oxy radical, regenerating rapidly by beta-elimination the alkyl radical responsible for the induced reaction, These reactions of elimination produce two fragments, an alkyl radical and an ester molecule, from linear ''acetalic'' radical, or they could be isomerizations in the case of cyclanyloxy radicals. In these last cases, the isomerization creates an ester function corresponding to a new protected functionality as aldehyde, acid, or alcohol.
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