Reaction of phenyl glycidyl ether with some heterocycles

The respective hydroxypropyl phenyl ethers were obtained by the reaction of 5,5-dimethylhydantoin, morpholine, benzotriazole, benzimidazole, pyrrolidone, and phthalimide with phenyl glycidyl ether. 8-(2-Hydroxy-3-phenoxy) quinoline was synthesized by O-alkylation. __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 817–820, June, 2008.     

Synthesis of 2-bromomethyl-4-methyl-2,3-dihydrofuro[3,2-<Emphasis Type="Italic">c</Emphasis>]-quinoline and some its transformations

Electrophilic intramolecular heterocyclization of 3-(2-chloroprop-2-en-1-yl)-2-methylquinolin-4-ol by the action of bromine gave 2-bromomethyl-2-chloro-4-methyl-2,3-dihydrofuro[3,2-c]quinoline hydrobromide which was converted into 2-hydroxymethyl-, 2-alkoxymethyl-, and 2-dialkylaminomethyl-4-methylfuro[3,2-c]quinolines by treatment with the corresponding nucleophiles.     

Synthesis of substituted 2,4-dimethylthieno[3,2-<Emphasis Type="Italic">c</Emphasis>]quinolines

A procedure was developed for the synthesis of substituted 2,4-dimethylthieno[3,2-c]quinolines via intramolecular cyclization and subsequent aromatization of 3-(2-chloroprop-2-en-1-yl)-and 3-(2-oxopropyl)-2-methylquinoline-4-thiols. The latter were obtained by alkaline hydrolysis of the corresponding thiuronium salts which were prepared in turn by reactions of 4-chloro-3-(2-chloroprop-2-en-1-yl)-and 4-chloro-3-(2-oxopropyl)-2-methylquinolines with thiourea.     

Synthesis and transformations of 2- and 4-(2-Methylquinolin-4-ylamino)benzoic acids and ethyl 4-(2-methylquinolin-4-ylamino)benzoates and their fluorescent properties

2- and 4-(2-Methylquinolin-4-ylamino)benzoic acids and ethyl 4-(2-methylquinolin-4-ylamino)-benzoates having a substituent in the 6(8)-position of the quinoline ring were synthesized by reaction of the corresponding substituted 4-chloro-2-methylquinolines with 2- and 4-aminobenzoic acids and ethyl 4-aminobenzoate. Intramolecular cyclization of 2-(2-methylquinolin-4-ylamino)benzoic acids in concentrated sulfuric acid gave 7-hydroxy-6-methyldibenzo[b,h][1,6]naphthyridines, and ethyl 4-(2-methylquinolin-4-ylamino)benzoates were converted into 4-(2-methylquinolin-4-ylamino)benzoic acids by alkaline hydrolysis.     

Lacunary series and sharp estimates in weighted spaces of holomorphic functions

The well-known Paley inequalities for lacunary series are applied in investigation of weighted spaces H(p, α) and H(p, log(α)) of functions holomorphic in the unit disc of the complex plane. These are spaces which are similar to the Bloch and Hardy spaces and naturally arise as the images of some fractional operators.     

Nonlinear properties of gated graphene in a strong electromagnetic field

We develop a microscopic theory of a strong electromagnetic field interaction with gated bilayer graphene. Quantum kinetic equations for density matrix are obtained using a tight binding approach within second quantized Hamiltonian in an intense laser field. We show that adiabatically changing the gate potentials with time may produce (at resonant photon energy) a full inversion of the electron population with high density between valence and conduction bands. In the linear regime, excitonic absorption of an electromagnetic radiation in a graphene monolayer with opened energy gap is also studied.     

Surface-emitted terahertz-wave generation by ridged periodically poled lithium niobate and enhancement by mixing of two terahertz waves

Surface-emitted terahertz- (THz-) wave generation by difference-frequency mixing with ridge-shaped periodically poled lithium niobate (PPLN) was demonstrated. The PPLN had a ridge height of 300 microm, a thickness of 20 microm, and an interaction length of 35 mm. The ridge behaves as a slab waveguide for optical pump beams. The PPLN gives rise to THz waves in opposite directions, perpendicular to the pump-beam direction. Reflecting the THz wave on one side and overlapping it with the THz wave on the other side increased the total THz-wave intensity approximately 2.7 times compared with that without reflection and mixing.     

Design of a 20 MeV electron beamline for experiments on radiation processes

A beamline for 20 MeV electrons has been developed and mounted at Yerevan Physics Institute (YerPhI). The beamline was obtained by parallel transfer of the beam from the operating 75 MeV injector-linac of the 6 GeV Yerevan synchrotron. Parameters of the beam allow performing experimental studies of radiation of electrons in single crystals.     

Phase transitions in a few-electron quantum dot in a magnetic field: Wigner phases and broken-symmetry spin-singlet states

We develop a variational many-body approach within a second quantized formulation for a few-electron system in a parabolic two-dimensional quantum dot (QD). By way of application, the nature of the ground state of a two-electron system in a parabolic QD in a broad range of magnetic fields is theoretically investigated. Various phase transitions on the basis of the resulting analytical expressions for energy of the system have been investigated: First, the well-known transition from a maximum density droplet to a Wigner phase in a magnetic field is obtained, provided that the QD is in conditions of weak confinement. Furthermore, in the case of relatively strong QD confinement and weak magnetic fields, a rotationally symmetric spin-singlet state is the ground state of the system. However, in a strong magnetic field and for the same QD confinement, a broken-symmetry spin-singlet state appears to be energetically favored over the symmetric spin-singlet state. A first investigation of such a broken-symmetry spin-singlet phase in a QD in a magnetic field is shown to be an important application of the proposed technique. The text was submitted by the authors in English.     

Photonuclear reactions on 112,118,124Sn,natTe, and natHf targets

The yields of products of photonuclear reactions on tin targets enriched in the isotopes ^112,118,124Sn and on Te and HfO₂ targets of natural isotopic composition were measured. The targets were irradiated at the linear electron accelerator of the A.I. Alikhanian National Science Laboratory (Yerevan Physics Institute) at the electron energy of E _e = 40 MeV. The dependence of the product yields on the nucleonic composition of the targets was discussed. The isomeric ratios were obtained for the ^119m,g Te, ^121m,g Te, ^117m,g In, and ^123m,g Sn products. The experimental data in question were compared with their theoretical counterparts calculated on the basis of the TALYS 1.4 code. The dependence of the isomeric ratios on the photon energy and on the mass number of the product is considered.