Synthesis of some N-acylbenzoxazolinones

In a search for pesticides, a series of hitherto undescribed N-acylbenzoxazolinones and 6-chloro-N-acylbenzoxazolinones are synthesized. The yields of these compounds and their resistances to hydrolysis are higher, the greater the basic properties of the aromatic (benzoxazolinone) system, and the stronger the acid properties of the acylating agent. Two chlorine atoms react when benzoxazolinone (I) and 6-chlorobenzoxazolinone (II) are acylated with, dichloropropionyl chloride.     

Interaction of 1-Benzyl-4-benzoyl-5-phenyl-2,3-dihydro-2,3-pyrroledione with Ketene Diethylacetal: Synthesis and Crystal and Molecular Structure of 1-Benzyl-4-benzoyl-3-hydroxy-5-phenyl-5-ethoxycarbonylmethyl-2,5-dihydro-2-pyrrolone

1-Benzyl-4-benzoyl-5-phenyl-2,3-dihydro-2,3-pyrroledione reacts with ketene diethylacetal, forming 1-benzyl-4-benzoyl-3-hydroxy-5-phenyl-5-ethoxycarbonylmethyl-2,5-dihydro-2-pyrrolone, whose crystal and molecular structure was studied by XRD.     

The strong coupling constants of excited positive parity heavy mesons in light-cone QCD

We calculate the strong coupling constants g_p^**p^*π, where P^** (D^**, B^**) is the 1⁺ p-wave state, in the framework of the light-cone QCD sum rules, and using these values ofg_p^**p^*π , we compute the hadronic decay widths forD^** → D^* π and B^** → B^* π.     

Synthesis of 2,5-disubstituted pyrroles by the reaction of ketoximes with 1,2-dibromopropane

Conclusions The reaction of ketoximes with 1,2-dibromopropane in the KOH-DMSO system gave 2,5-disubstituted pyrroles in 21–56% yield.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2175–2177, September, 1988.     

Investigation of dc hopping conduction in TlGaS2 and TlInS2 single crystals

It is established that variable-range hopping conduction takes place between states localized near the Fermi level in layered TlGaS₂ and TlInS₂ single crystals both along and across their natural layers in a constant electric field at T⩽200 K. The densities of states near the Fermi level and the hopping distances at different temperature are estimated. The occurrence of activationless hopping conduction is established in TlGaS₂ and TlInS₂ single crystals in the temperature range 110–150 K. Fiz. Tverd. Tela (St. Petersburg) 40, 612–615 (April 1998)     

Forbidden rotational spectra of axially symmetric polar molecules

In this paper we consider the rotational transitions induced by centrifugal distortion in polar or quasipolar symmetric top molecules belonging to the point groups C_n and C_nv (n ≥ 3). It is shown that in this series only the molecules of point groups C₃, C_3v, C₄, and C_4v may possess rotational spectra induced by first-order centrifugal distortion. A general expression is given for the effective dipole moment operator and for its matrix elements. The peak absorption coefficients for some of the strongest ΔK = 3 transitions of the CH₃D molecule have been calculated and compared with the peak absorption coefficients of allowed transitions.     

Nonsteady perturbation theory for Green's functions

A simple method is proposed for uncoupling a complex chain of Green's function (GF) equations when the initial GF is coupled simultaneously with several higher-order GF. Uncoupling of the chain of equations of motion for the nuclear spin anticommutator Green's function provides an example of the use of this method.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 126–133, August, 1978.