Asymmetric opening of styrene oxide with p-toluidine catalyzed by BINOL polyols and their lithium complexes

Opening of racemic styrene oxide with p-toluidine catalyzed by chiral BINOL-derived polyols proceeded regioselectively mainly with the formation of 2-phenyl-2-(p-tolylamino)-ethanol with low ee values.     

A space monitoring system for powerful impulsive sources

The paper describes a space monitoring system for powerful impulsive sources designed for detecting storm fronts and lightning activity, predicting powerful magnetic storms, and analyzing the characteristics of faults in the Earth’s curst. It is shown that onboard apparatus can also be used to detect solar and Galactic ionizing-radiation activity, determine the total electron content in the ionosphere, etc. In conclusion, examples of social-economic problems that can be solved using the impulsive-source monitoring system are presented, and perspectives for the further development of this system are discussed.     

Synthesis of lupane triterpenoids with triphenylphosphonium substituents and studies of their antitumor activity

New derivatives of lupane triterpenoids, viz., 20,29-dihydrobetulinic and 3-epi-20,29-dihydrobetulinic acid derivatives containing triphenylphosphonium fragments as substituents were synthesized. These compound considerably exceed betulinic acid in antitumor activity.     

Complexes of PdCl2 with chiral oximes of α-(o-anisidino)caranone and α-(o-anisidino)pinanone: synthesis and crystal structures

3-(2-Methoxyphenylamino)caran-4-one and 2-(2-methoxyphenylamino)pinan-3-one E-oximes obtained from appropriate natural terpenes were transformed into 1: 1 complexes with PdCl₂. The structures of the complexes were examined by X-ray diffraction.     

Synthesis of thiacyanine dyes containing coumarin moieties at benzothiazole rings

New bischromophoric dyes (thiacarbocyanine and thiadicarbocyanine) containing coumarin moieties at each of the two benzothiazole systems, as well as monomethinecyanine containing coumarin moiety at only one heterocyclic system, manifest significant batho-chromic shift compared to relative coumarin-free dyes.     

Quantum-chemical calculations of electronic-absorption spectra of aromatic amino acids in aqueous solution

Quantum-chemical methods are used to calculate electronic-absorption spectra, dipole moments, and atomic-charge distributions of aromatic amino acids in aqueous solutions at various concentrations. The electronic-absorption spectra are analyzed and compared with the spectra that are calculated for gas phase. The bathochromic shift of the spectral position is shown for the long-wavelength absorption peak of the singlet-singlet transition for aqueous solutions of amino acids.