XAFS has been measured for the nickel oxide cluster in the Y-zeolite. The atomic distances in the cluster are close to those in the crystallite NiO. However, the weak intensity of Ni-fourth neighbor Ni and the coordination numbers give a model of the cluster in the supercage.
Various dinuclear copper(II) compounds bridged by the oxalato, oxamato, and oxamidato ligands were prepared and characterized by means of magnetic susceptibility and IR spectroscopy. The strong antiferromagnetic couplings through their carboxylate or carboxamidate groups are interpreted in terms of the ligand basicities and the electron withdrawal due to the resonance of the substituents.
The anionic chelate of scandium(III) with hexafluoroacetylacetone (Hhfa) was extracted into chloroform in the presence of the tetrabutylammonium ion (tba+), though such an anionic chelate was not extracted when the chelating extractant was 2-thenoyltrifluoroacetone (Htta). The extraction was also studied in the same systems in the presence of trioctylphosphine oxide (TOPO); the extraction of the anionic complex, Sc(hfa)4−tba+, was compared with that of the adducts with TOPO, Sc(hfa)3(TOPO)n.
Zinc chloride was successfully employed in the Friedel–Crafts benzylation of benzenes as a useful catalyst in the presence of polar solvents. Particularly, zinc chloride dissolved in primary alcohols, ketones, and water with a molar ratio of 1 was a highly effective catalytic system in the reaction.
Palladium-catalyzed cross-coupling of organic halides with organotin compounds in the presence of norbornadiene gave 5,6-disubstituted norbornene, which was treated by a retro Diels–Alder reaction yielding cis-ethene and cyclopentadiene.
2-Ethylthio-3-phenyl-1,3,4-thiadiazolium tetrafluoroborate (2) was synthesized by the reaction of 3-phenyl-1,3,4-thiadiazole-2(3H)-thione (1) with triethyloxonium tetrafluoroborate (Meerwein’s reagent) in acetonitrile at room temperature. A structural investigation of 2 was carried out on the basis of such spectral data as 1H NMR and 13C NMR spectroscopies and X-ray analysis. The crystallographic data of 1 and 2 are as follows: Orthorhombic space group of P212121, a = 10.116(2), b = 13.199(2), c = 6.690(2) Å, V = 893.3(3) Å3, and Z = 4 for 1, orthorhombic space group of Pbca, a = 16.449(6), b = 15.291(3), c = 10.833(2) Å, V = 2725(2) Å3, and Z = 8 for 2, respectively.
The effects of hydrostatic pressure on the complexation of t-butylammonium perchlorate by crown ether in methanol were studied by means of a high-pressure high-resolution NMR method at 33.5 °C. The complexation was shown to be promoted upon pressurization.
7,12-Epoxy-7,12-dihydrobenz[a]anthracene-8,11-dione and 5,12-epoxy-5,12-dihydronaphthacene-1,4-dione have been synthesized. Both of them had pronounced intramolecular charge-transfer bands, although the donor and the acceptor were in unfavorable spatial position and furthermore in one of them its HOMO–LUMO interaction is forbidden.
Reduction of tosylhydrazones by hydride reagents in wet alcohol gave predominantly alcohols whose stereochemistries are opposite to those of the major reduction products of the corresponding ketones with sodium borohydride.