A palladium-catalyzed, enantioselective, aryl-aryl cross-coupling reaction using 1-naphthyldimethylsilanolates and chiral bis-hydrazone ligands has been developed. A family of glyoxal bis-hydrazone ligands containing various 2,5-diarylpyrrolidine groups was prepared to evaluate the influence of ligand structure on the rate and enantioselectivity of the cross-coupling. New synthetic routes to th...

Aryl ethers are important linking units in the structure of lignins and low rank coals that are thermally labile at 375°C. Mass transport limitations experienced in these cross-linked macromolecular solids can lead to alterations in thermochemical processing kinetics and product yields. The molecular level details of these alterations on reaction pathways are revealed through studies of model c...

Aryl-cobalamins are a new class of organometallic structural mimics vitamin B12 designed as potential ‘antivitamins B12’. Here, the first cationic aryl-cobinamides described, which were synthesized using newly developed diaryl-iodonium method. The obtained pairs coordination isomers, stereo-structure was unambiguously assigned based on homo- and heteronuclear NMR spectra. availability isomers w...

The U4/U6.U5 tri-snRNP is a key component of spliceosomes. By using chemical reagents and RNases, we performed the first extensive experimental analysis of the structure and accessibility of U4 and U6 snRNAs in tri-snRNPs. These were purified from HeLa cell nuclear extract and Saccharomyces cerevisiae cellular extract. U5 accessibility was also investigated. For both species, data demonstrate t...

a series of 2-amino-4-aryl-3-cyano-7-(dimethylamino)-4 h -chromenes was synthesized by condensation of 3-(dimethylamino)phenol, an aromatic aldehyde and malonitrile in ethanol containing piperidine. the assignments of the structure of all synthesized compounds were based on spectral data (ir, mass and 1 h nmr). the cytotoxic activities of the synthesized compounds against six human tumor cell l...

The remarkable regularity of rotational spectra of superdeformed nuclei has prompted many investigations into the contribution of higher multipoles on the formation of shell structure [1]. Related questions have arisen for other mesoscopic systems. In particular, it appears that octupole deformation has the same importance for two-dimensional systems like quantum dots and surface clusters [2] a...

There are three independent Cd(II) ions in the title complex, {[Cd(3)(C(10)H(3)O(8))(2)(H(2)O)(4)]·4H(2)O}(n), one of which is coordinated by four O atoms from three 5-carboxybenzene-1,2,4-tri-carboxyl-ate ligands and by two water mol-ecules in a distorted octa-hedral geometry. The second Cd(II) ion is coordinated by five O atoms from four 5-carboxybenzene-1,2,4-tri-carboxyl-ate ligands and by ...