Rearrangement-Cleavage of Ammonium Salts Containing a 3-Methyl-2-naphthylmethyl Group

The example of the rearrangement-cleavage under the action of 25% aqueous potassium hydroxide at 90-92°C of ammonium salts containing both 3-methyl-2-naphthylmethyl and 2-bromoethyl, allyl, methallyl, 2-bromoallyl, 3-phenylallyl, 2-propynyl, or 3-phenylphenyl-2-propynyl groups was used to show that the reaction always involves the aromatic ring of the 3-methyl-2-naphthylmethyl group. Along with rearrangement-cleavage, nucleophilic substitution of the 2-naphthylmethyl group takes place.     

Design of Novel Catalysts Based on Acridine Derivatives Immobilized on Carbon Materials for Molecular Hydrogen Production

Russian Journal of General Chemistry - Immobilization of acridine and its derivatives (9-phenylacridine and N-methyl-9-phenylacridinium iodide) has been studied and quantitative data on physical...     

Storage of intense optical pulses in solids

Possibility to store optical information in media with fast relaxations is studied in case of arbitrary intensities of probe and control pulses. Analytical solution of the self-consistent system of equations for propagation and density matrix is obtained with allowance for the first non-stationary corrections. A new scheme of storage is proposed which allows an essential reduction of the optical length needed for storage.     

Thermodynamics of liquid-gas phase equilibria of diisopropyl and dibutyl sulfoxides

Saturation vapor pressures of diisopropyl (DIPSO) and dibutyl (DBSO) sulfoxides are measured in the temperature range of 303.15 to 323.15 K. The boiling temperatures of DIPSO and DBSO at normal pressure are determined from the resulting data by graphical extrapolation, and their molar heats of vaporization and changes in entropy during their vaporization are calculated. The final results and literature data are compared for other dialkyl sulfoxides.     

Stability of a swarm of air bubbles in an oscillating liquid

The phenomenon of the formation of a swarm of air bubbles in a liquid executing vertical oscillations within a vertical tube is described. The explanation for the mechanism of air entry into the liquid and the behavior of the individual minute bubbles was given in [1], In the present paper we examine a swarm of bubbles—an air cushion; the stability of this swarm is studied. The results of experimental studies and theoretical calculations are compared.     

Shape resonances in slow electron scattering by aromatic molecules. I. Anthraquinone derivatives

A series of anthraquinone (C(14)O(2)H(8)) derivatives has been studied by means of electron capture negative ion mass spectrometry (ECNI-MS), photoelectron spectroscopy (PES), and AM1 quantum chemical calculations. Mean lifetimes of molecular negative ions M(-.) (MNI) have been measured. The mechanism of long-lived MNI formation in the epithermal energy region of incident electrons has been investigated. A simple model of a molecule (a spherical potential well with the repulsive centrifugal term) has been applied for the analysis of the energy dependence of cross sections at the first stage of the electron capture process. It has been shown that a temporary resonance of MNI at the energy approximately 0.5 eV corresponds to a shape resonance with lifetime 1-2.10(-13) s in the f-partial wave (l = 3) of the incident electron. The next resonant state of MNI at the energy approximately 1.7 eV has been associated with the electron excited Feshbach resonance (whose parent state is a triplet npi* transition). In all cases the initial electron state of the MNI relaxes into the ground state by means of a radiationless transition, and the final state of the MNI is a nuclear excited resonance with a lifetime measurable on the mass spectrometry timescale. Copyright 1999 John Wiley & Sons, Ltd.     

Modification of ceramic monoliths with dimethyl(vinylethynyl)carbinol polymers

Radical polymerization of dimethyl(vinylethynyl)carbinol on ceramic monolithic supports was studied with the aim to synthesize composite monolithic sorbents with applied hydrophilic-hydrophobic polymer.