摘要
研究了二异丙胺(DIPA)、2,2,6,6—四甲基—4—羟基啶(TMHP)与四氯苯醌(CA)、苯醌(BQ)在一些溶剂形成电荷转移络合物(CTC)的反应。结果表明:DTPA—CA呈色较快,生成的CTC紫外光谱λ_(CTC)吸收值变化大。在环已烷中分离出N-取代产物。用甲醇作溶剂,则得到2,3,5,6-四甲氧基-1.4-苯醌(TMOBQ)。文中还用电子自旋共振谱,证实了CTC中存在醌负离子自由间体。
The transformation of charge transfer complexes(CTC) of chloranil(CA) and 1, 4-benzoquinone(BQ) with two hindered amines, such as. diisopropylamine(DIPA) and 2, 2, 6, 6-tetramethyl-4-hydroxyl-piperi dine(TMHP) has been investigated by ultraviolet adsorption spectra in polar or non-polar solvents. The results indicate that the CTC of DIPA-CA changes colour rapidly, and UV absorption spectra of CTC (λcrc) in the ultraviolet-visible region are dependent on the polarity of the solvent, The CTC of DIPA-CA leads to the formation of monosubstituted product in cyclohexane, but a tangerine solid has been found in methanol. The solid product has been isolated and characterised as 2, 3, 5, 6-tetramethoxyl-1, 4-benzoquinone(T-MGBQ) by MS and elemental analysis. The chloranil and benzoquinone radical anions formed in process of CTC formation have been odserved by electron spin resonance (ESR) technique.
出处
《化学研究与应用》
CAS
CSCD
1990年第3期45-50,共6页
Chemical Research and Application
关键词
有机胺
醌
电荷转移络合物
Hindered amines Quinones Charge transfer complexes.
