Cases of pronounced extended ?,n-participation in solvolysis oftert-butyl and benzyl chloride derivatives
作者:Sandra Juri?、Olga Kronja
DOI:10.1002/poc.853
日期:2005.4
Solvolysis rates of chlorides that share the same side-chain comprising two neighboring groups [tertiary chloride 10, 2-chloro-2,6-dimethyl-9-methoxy-(6E)-nonene, and benzyl chlorides 11, 1-chloro-1-aryl-5-methyl-8-methoxy-(5E)-octene, with various phenyl substituents (Y = p-OCH3, p-CH3, H, p-Br and m-Br)], were measured in 80% (v/v) aqueous ethanol. Both the tertiary substrate 10 and the benzyl substrates
共享相同侧链包括两个相邻的基团[叔氯化物氯化物的溶剂分解率10,2-氯-2,6-二甲基- 9-甲氧基(6 ë)壬烯,和苄基氯11,1-氯测量了具有各种苯基取代基(Y = p -OCH 3,p -CH 3,H,p -Br和m -Br)的1-芳基-5-甲基-8-甲氧基-(5 E)-辛烯。溶于80%(v / v)的乙醇水溶液。第三衬底10和苄基衬底11两者溶剂分解与激活比相应的参考类似物的小熵和焓与一个相邻基团,6和8,分别为(ΔΔ ħ ≠ = -34±6千焦摩尔-1,ΔΔ小号≠ = -122±19Ĵķ -1 摩尔- 1与10 ;ΔΔ ħ ≠ = -33±6千焦摩尔-1,ΔΔ小号≠ = -95±17Ĵķ -1 摩尔-1与11),这表明除了双键的甲氧基也参与速率确定步骤。氯化物10具有显著降低二次β-氘动力学同位素效应(ķ ħ / ķ d = 1.07±0.01在80E; ķ ħ /