Synthesis and spectroscopic investigation of some dimeric coumarin and furanocoumarin models
作者:M. H. A. Elgamal、N. M. M. Shalaby、M. A. Shaban、H. Duddeck、B. Mikhova、A. Simon、G. T�th
DOI:10.1007/bf00807602
日期:——
The synthesis of some dimeric coumarin and furanocoumarin models and their structure elucidation by H-1 NMR, C-13 NMR, and mass spectroscopy is presented. In the presence of moisture some aldehydes are accompanied by their hydrates. Methoxy signal doubling in the presence of a chiral lanthanide shift reagent proves the dimeric nature of compound 8. In the mass spectra, heterolytic cleavage of the O-C linkage was noticed which is a ran fragmentation in the case of aromatic ethers.
HISHMAT, O. H.;EL-DIWANY, H. I.;FAWZY, N. M., EGYPT. J. PHARM. SCI., 30,(1989) N-4, C. 317-327
作者:HISHMAT, O. H.、EL-DIWANY, H. I.、FAWZY, N. M.
DOI:——
日期:——
Furo-chromones and -Coumarins. XIII. The Dicoumarol Analogs of Bergapten, Isopimpinellin and Pimpinellin
作者:Alexander Schönberg、Nasry Badran、Nicolas A. Starkowsky