The diffusion NMR studies of crown ethers-cyclodextrin complexation process.

Formation of complexes between crown ethers and cyclodextrins has been studied using diffusion measurements. The structures of the complexes have been proposed on the basis of the theoretical calculations and the results obtained. Relation between the structural parameters (rings' diameter and symmetry) and the tendency of molecules' interactions are discussed.

Multinuclear magnetic resonance studies of fluoronitroanilines.

Ten fluoronitroanilines have been synthesized and the (1)H, (13)C, (15)N and, (19)F NMR spectra of these compounds have been recorded and fully assigned. Density functional theory(DFT) calculations have been performed for all compounds studied. Experimental and theoretical results are compared and the structure and atom character influence on the accuracy of the calculation discussed.

Mammillarinin: a new malonylated betacyanin from fruits of Mammillaria.

A new betacyanin endogenously occurring in fruits of nine Mammillaria species, i.e., M.

Minor betalains in fruits of Hylocereus species.

Betacyanins in peel and flesh of fruits of different Hylocereus species were identified by means of GC/MS, electrospray MS/MS, HPLC as well as (1)H and (13)C NMR techniques. As hitherto unknown pigments: betanidin 5-O-(2'-O-beta-D-apiofuranosyl)-beta-D-glucopyranoside, betanidin 5-O-(4'-O-malonyl)-beta-D-glucopyranoside and betanidin 5-O-[(5''-O-E-sinapoyl)-2'-O-beta-D-apiofuranosyl]-beta-D-glucopyranoside were elucidated. The sinapoyl moiety attachment position in the structure of betacyanins was established for the first time.