Calix[4]quinones III: The Synthesis of<i>p</i>-Hydroxycalix[4]arenes by Wolff-Kishner Reduction
作者:Ching-Yu Tsoo、Rong-Fua Chen、Wen-You Wang、Lee-Gin Lin
DOI:10.1002/jccs.200400091
日期:2004.6
The Wolff-Kishnerreduction of the half-protected ketal calix[4]monoquinone 3 and its basic hydrolysis product 4 produced a partially reducing product 5. When the same reduction conditions were applied to the calix[4]quinone benzoates 1 and 2, the corresponding title compounds, p-hydroxycalix[4]arenes (6 and 7), were afforded in one step.
A series of new azocalix[4]arenes containing one, two, three, and four free phenolic groups have been synthesized through the reaction of 4-nitro- and 2,4-dinitrophenylhydrazines with flexible calix[4]arene diquinones as well as through diazocoupling reactions of calix[4]arenes. Characterization of synthesized compounds by spectroscopic methods and X-ray diffraction revealed that azocalix[4]arenes
Calix[4]quinone. Part 2: Intramolecular Michael-addition of calix[4]diquinone
作者:Ker-Ming Yang、Ming-Dar Lee、Rong-Fua Chen、Yi-Lin Chen、Lee-Gin Lin
DOI:10.1016/s0040-4020(01)00788-8
日期:2001.9
The oxidation of calix[4]arene dibenzoate 1 with chlorine dioxide yielded the corresponding calix[4]diquinone 2 and an intramolecular Michael-addition product 3. Reaction of diquinone 2 with ethylene glycol under acidic conditions produced the half-protected ketal derivative 4. The removal of benzoate moieties from compound 4 in basic conditions produced a phenoxide anion, which underwent intramolecular