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利用Krespan法合成全氟叔丁基碘(I),并证明它的结构.以溴代碘可进一步发展Krespan法,合成全氟叔丁基溴(II).碘化物(I)[或溴化物(II)]与二乙基胺或乙醇-氢氧化钾反应时,其第一步为亲核试剂直接对碘(或溴)原子进攻的类S_N2型反应,产物与由全氟异丁烯和有关试剂直接反应所得者相同.测定(CF_3)_3CI,(CF_3)_2CFI及CF_3CF_2CF_2I之紫外光谱溶剂位移值δ(H-B),所得之值为各全氟型烷基的吸电性诱导效应顺序(CF_3)_3C>(CF_3)_2CF>CF_3CF_2>CF_3初步提供论据.本文并讨论各种顺序的观点.
Synthesis of perfluoro-t-butyl iodide (I) by Krespan method and its structure was confirmed. The Krespan method was further developed using brominated iodine to synthesize perfluoro-t-butyl bromide (II) (II)] with diethylamine or ethanol-potassium hydroxide, the first step is the S_N2-type reaction in which the nucleophile attacks the iodine (or bromine) atom directly, and the product is reacted with a mixture of perfluoroisobutylene and related reagents (CF_3) _3CI, (CF_3) _2CFI and CF_3CF_2CF_2I UV spectroscopy solvent displacement value δ (HB), the value obtained for each of the perfluorinated alkyl electrogenic inductive effect sequence (CF_3) _3C > (CF_3) _2CF> CF_3CF_2> CF_3 This article also discusses various sequential perspectives.