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Absolute configuration of lippifoliane and africanane derivatives.
The biogenetic relationships between lippifolianes 1-3 and africanane derivatives 7-9 and 13 isolated from the same species, together with chiroptical data for africananes isolated fromThe Hepaticae family, complete a stereochemical scenario in relation to the absolute configuration of afAfricananes from L. integrifolia. Expand
Chemical composition, seasonal variation and a new sesquiterpene alcohol from the essential oil of Lippia integrifolia
Chemical investigations on the essential oil of Lippia integrifolia performed by column chromatography, HPLC, GC–MS, 1H- and 13C-NMR spectroscopy led to the identification of 78 components. A newExpand
A vibrational study of 3,3,6,6-tetramethyl-1,2,4,5-tetroxane: The spectra of the deuterated substance and the scaled quantum mechanics force field
Abstract The vibrational properties of 3,3,6,6-tetramethyl-1,2,4,5-tetroxane (diacetone diperoxide) were calculated theoretically using DFT procedures. The obtained results and the experimentalExpand
Trends in the Structural and Vibrational Properties of the Disulfanes S2X2 (X = H, Halogen, CH3, CF3)†
The geometrical parameters and associated force constants for the molecules XSSX (X = H, halogen, CH3, CF3) were studied using DFT quantum chemistry calculations. The study showed rather monotonicExpand
Experimental and theoretical vibrational study of methylene bis(thiocyanate), CH2(SCN)2. A comparison with thiocyanogen, (SCN)2.
The infrared and Raman spectra of methylene bis(thiocyanate), CH2(SCN)2, were obtained and the observed bands were assigned to the different normal modes of vibration using the results of a DFT calculation of the molecular vibrational properties to define a Scaled Quantum Mechanics force field. Expand
An experimental and theoretical vibrational study of 3,3,6,6-tetramethyl-1,2,4,5-tetrathiane
Abstract 3,3,6,6-tetrametyl-1,2,4,5-tetrathiane, [(CH 3 ) 2 CS 2 ] 2 , was prepared and the corresponding infrared and Raman spectra were measured. The observed bands were assigned to the differentExpand
Experimental simulation of stellar speckle interferometry
Sorne results obtained using speckle interferometry in a coherent optica! system are shown with a synthetic diffuser generated by an m x n matrix of random integer numbers with zero average by meansExpand
A Quantum Chemistry Approach to the Force Fields of the Asymmetrical Thionyl Halides FS(O)Cl, CF3S(O)F and CF3S(O)Cl
The vibrational properties of the asymmetrical thionyl halides FS(O)Cl, CF3S(O)F and CF3S(O)Cl were studied by means of density functional theory (DFT) techniques. The available experimental data andExpand