Intramolecular meerwein reactions of the anthraquinone system. Synthesis, X-ray structural analysis and spectroscopic properties of anthra[9,1-<i>bc</i>:10,5-<i>b'c'</i>]tetrahydrodipyran derivatives
作者:H. Fritz、G. Rihs、P. Sutter、C. D. Weis
DOI:10.1002/jhet.5570180817
日期:1981.12
methylphosphonate as reaction medium. Compounds 5–18 were isolated as mixtures of diastereomers, some of which were separated by crystallization. Proof of structure and stereochemistry was obtained for some of the compounds by X-ray crystallographic analysis. The 1H- and 13C-nmr data provided further support. Surprisingly large chemical shift differences between some of the proton signals of isomers were observed