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γ射线辐照乙醇,通过苯乙烯抑制其辐解产物的研究,证明在乙醇介质中α-羟乙基自由基只进行重合反应,而无歧化反应;苯乙烯可与α-羟乙基自由基反应,其竞争反应为Sl+CH_3 CHOH→P 2CH_3CHOH→(CH_3CHOH)_2求得动力学方程为G’=G_0 k_6/2(k_7) 1/2 (G’/Dk’)[Sl] G_0为纯乙醇γ射线辐照时2、3-丁二醇的产额,G_0=2.1,k_6/(k7)~(1/2)=0.53.假定k_7为扩散反应速率常数,则α-羟乙基自由基与丰乙烯加成反应的速率常数为k_6=4.0×10~4 L.mol~(-1).s~(-1).
Irradiation of γ-rays by ethanol, styrene inhibition of its radiolysis product studies have shown that in the ethanol medium α-hydroxyethyl radical only the polymerization reaction without disproportionation reaction; styrene and α-hydroxyethyl free radical Reaction, the competitive reaction for the Sl + CH_3CHOH → P 2CH_3CHOH → (CH_3CHOH) _2 kinetic equation G ’= G_0 k_6 / 2 (k_7) 1/2 (G’ / Dk ’) [Sl] G_0 is pure The yields of 2,3-butanediol when irradiated by ethanol γ-rays are G0 = 2.1 and k_6 / (k7) ~ (1/2) = 0.53. Assuming that k_7 is the diffusion rate constant, α-hydroxyethyl free The rate constant for the addition of base to vinylidene was k_6 = 4.0 × 10 ~ 4 L. mol ~ (-1) s ~ (-1).