Racemic compounds containing a phosphorus or a sulfur atom as a chiral center were resolved by high-performance liquid chromatography on optically active (+)-poly(triphenylmethyl methacrylate). The resolved compounds include insecticides such as O-ethyl O-(4-nitrophenyl) phenylphosphonothionate (EPN), O-(4-cyanophenyl)-O-ethyl phenylphosphonothionate (cyanofenfos), and 2-methoxy-4H-1,3,2-benzo-dioxaphosphorin 2-sulfide (salithion).
The reaction of copper colloid in ethanol was studied. In the beginning of the reaction, very small particles reacted with ethanol producing ethoxide. With the proceeding of the reaction, the 577-nm characteristic copper band showed a red shift together with the broadening of the line width. This was explaind by the size dependence of the particles on the spectrum. Lead colloid was also examined.
The voltammetry of methylferrocene (MeFC) in a dodecyltrimethylammonium bromide micellar solution leads to the conclusion that most MeFC molecules reside in the micelle phase. They are located within the hydrophobic core where water cannot reach, judging from our finding that oxygen decomposes MeFC in the presence of water, but otherwise does not.
Line shapes of the Balmer-β line of H* produced in dissociative excitation of C6H6 were precisely measured. The translational energy distributions of H* (n=4) have two peaks at about 1 and 4 eV, and their relative intensity depends on incident electron energy.
Solubility product values of the rare earth fluorides were determined potentiometrically by using fluoride ion-selective electrodes at 25.0 °C. The pKsp values of the lanthanoid fluorides decreased gradually from 20.0 to 16.9, while the value for yttrium fluoride was locate in between those of terbium and dysprosium fluorides. The value for scandium fluoride was appreciably smaller than any of the lanthanoid fluorides, as expected from the cationic radii. The solubility product value of lanthanum fluoride single crystal could not be determined, since the saturated solution was not obtained through measurements of over three months.
For anodic bromination of thymol, MeCN and MeOH were suitable solvents for mono- and dibromination respectively. In MeCN, no dibrominated product was observed even when four Faradays per mole of thymol were passed.
The 1- or 4-hydroxyl group in cis isomers of 3-alkoxycarbonyl-1-tetralols and 2-ethoxycarbonyl-4-thiochromanols are predominantly quasi-equatorial and those of the trans isomers quasi-axial. cis-2-Ethoxycarbonyl-4-chromanol prefers the quasi-axial OH conformation.
The π-electron density distribution in benz[a]indeno[1,2,3-cd]azulene and the corresponding azepinium ion has been calculated by the PPP MO method. The effects of the hetero atom and the benzo annellation on the π-electron density and bond order of the cyclopent[cd]azulene are discussed.
The induced circular dichroism (CD) spectra of the sequential histidine polypeptide–azo dye complexes were measured. The induced CD arose from the dye bound to the polypeptide in the random coil conformation. The intensity of the induced CD decreased with increasing distance between the intramolecular histidine residues.
A new inorganic ion exchanger, cerium(IV) selenite has been synthesized with a cation exchange capacity of 0.98 mequiv g−1. It is fairly stable in water and in dilute solutions of acids, bases and salts. The Kd values for number of metal ions were determined in different solvent systems. The exchanger possesses a high affinity for Hg(II) and hence its separation from certain metal ions have been made.
Silver(I) has been estimated by an amperometric method using hydrazine sulfide as titrant. The titration is carried out in ammonium tartrate–ammonia supporting electrolyte (pH≈9). Further, this method is extended to determine silver(I) in presence of lead(II). Under these conditions lead(II) reacts only after all silver(I) has been precipitated. The accuracy of the procedure is comparable with that obtained in classical method.
Nitrosyl complexes of molybdenum with the composition Mo(NO)2L2 (HL=8-quinolinol, 2-mercaptobenzothiazole, 2-pyridinethiol, or ethylmercaptoacetate) have been prepared. The infrared spectral absorptions at 1740 and 1625 cm−1 indicate that the nitrogen monoxide groups are coordinated as NO+ and are cis to each other. The 1H-NMR spectral studies are also presented. The analytical, magnetic and spectral data suggest that molybdenum is in formal zero oxidation state with octahedral coordination completed by univalent bidentate ligands.