A Facile Synthesis of Calix[4]quinone Crown-4-Ethers
作者:Chuan-Feng Chen、Qi-Yu Zheng、Zhi-Tang Huang
DOI:10.1055/s-1999-3677
日期:——
Diamide-calix[4]crown-4-ether 3, diester-calix[4]-crown-4-ether 5 and calix[4]-crown-4-ether 7 were conveniently oxidized by sodium perborate tetrahydrate in trifluoroacetic acid to afford the diquinone 4 and 6 and monoquinone 8, respectively. The structures of the calix[4]quinones were established by IR, MS, 1H NMR, 13C NMR and elemental analysis.