7.1 Introduction Homolysis a B A·+B Production of radical heat R—0--0—R一 2R—0● Dialkyl peroxide Alkoxyl radical 二烷基过氧化物 烷氧基自由基 homolysis 2X heat or light
7.1 Introduction A B Homolysis A + B Production of Radical; R O O R heat 2R O Dialkyl peroxide 二 烷 基 过 氧 化 物 Alkoxyl radical 烷 氧 基 自 由 基 X X homolysis heat or light 2 X
Reactions of radicals General reaction homolysis X-:-X 2X· heat or light H一:-cH 3 HX+·CH3 CH3 X-I-X CHX +X
Reactions of Radicals General reaction X X homolysis heat or light 2 X X + H CH3 HX + CH3 CH3 + X X CH3 X + X
7.2 Homolytic bond dissociation energies 7. 2A Homolytic bond dissociation energies and heats of reaction 7.2B Homolytic bond dissociation energies and the relative stabilities of radicals
7.2 Homolytic bond dissociation energies 7.2A Homolytic bond dissociation energies and heats of reaction 7.2B Homolytic bond dissociation energies and the relative stabilities of radicals
7.2B Homolytic bond dissociation energies and the relative stabilities of radicals Homolytic bond dissociation energies also provide us with a convenient way to estimate the relative stabilities of radicals
7.2B Homolytic bond dissociation energies and the relative stabilities of radicals Homolytic bond dissociation energies also provide us with a convenient way to estimate the relative stabilities of radicals
Relative stabilities of radicals CH3CH2CH2-—H CErCI ch H △FP=+94.5km2三 AH =+98 kcal mol- Propyl radical CH3CHCH3 HrCHCh3 Ho Isopropyl radical CH3 2 radical CH. 3 CH3CCH3 CHCCH3 +h. △Ho=+91 kcal mol H tert-Butyl radical 3° radical
Relative stabilities of radicals CH3 CH2 CH2 H CH3 CH2 CH2 + H Propyl radical 1 o radical H o = +98 kcal mol -1 CH3 CHCH3 H CH3 CHCH3 + H H o = +94.5 kcal mol -1 Isopropyl radical 2 o radical CH3 CCH3 CH3 H H o = +91 kcal mol -1 CHCCH3 CH3 + H tert-Butyl radical 3 o radical