The 13C NMR spectra of a series of 5,6-epoxides in decalinic systems were studied. The interpretation of the chemical shifts allowed us to formulate an empirical rule to predict the epoxide stereochemistry. A discussion of the scope and limitations of this method and its extension to larger carbon skeletons is also presented.Key words: epoxide stereochemistry, 13C NMR, NMR, decalinic systems, oxiranes.
Synthesis and detailed spectral analysis of a new 4-substituted
coumarin-amino acid derivate are presented in this paper. A new glycine
derivate of (3-nitro-2-oxo-2H-chromen-4-yl)amino]acetate was prepared by
condensation of 4-chloro-3-nitrocoumarin and ethyl glycinate hydrochloride.
The complete assignment of 1H and 13C NMR chemical shifts of the synthesized
compound was carried out by the aid of a combination of 1D (1H and 13C NMR)
and 2D (1H-1H-COSY, NOESY, HSQC and HMBC) NMR experiments.
Studies on ferrocene derivatives. V. 1H- and 13C-NMR chemical shifts of sterically hindered (2-alkylphenyl)ferrocenes.