Montmorillonite clay catalysis. Part 14.1 A facile synthesis of 2-substituted and 2,2-disubstituted 1,3-benzodioxoles
作者:Tong-Shuang Li、Li-Jun Li、Bo Lu、Feng Yang
DOI:10.1039/a805464i
日期:——
A series of 2-substituted and 2,2-disubstituted 1,3-benzodioxoles have been synthesised by reaction of catechol and pyrogallol with corresponding aldehydes and ketones catalysed by montmorillonite KSF or K-10. The reactions are completed within 2.7–24 h to give satisfactory yields. Ketones give better yields than aldehydes, although highly sterically hindered ketones and diaryl ketones fail to react at all.
DIETL, F.;GIERER, G.;MERZ, A., SYNTHESIS, BRD, 1985, N 6-7, 626-631
作者:DIETL, F.、GIERER, G.、MERZ, A.
DOI:——
日期:——
Chinone von Benzo- und Dibenzokronenethern
作者:F. Dietl、G. Gierer、A. Merz
DOI:10.1055/s-1985-34140
日期:——
Quinones of Benzo- and Dibenzo-Crown Ethers: The preparation of the 1,4-quinones of benzo[15]crown-5 (1), benzo [18]crown-6 (2) and dibenzo[18]crown-6 (3) and their quinols is described. The quinones are obtained by Fremy salt oxidation of the corresponding 3-hydroxybenzo-crown ethers which are readily accessible by a double protective group synthesis from 1,2,3-trihydroxybenzene. The synthetic pathway also provides a general high yield preparation of 2,3-dialkoxyl-1,4-benzoquinones. The new crown ethers are characterised b y 1H- and 13C-N. M. R. as well as U. V. spectroscopy. Non-aqueous redox potentials are determined by cyclic voltammetry. Crystalline complexes of 1 and 2 with various ammonium, alkali, and alkaline earth cations are also described.