Synthesis and some properties of 4,5-dihydrofurfural

Conclusions 4,5-Dihydrofurfural was synthesized and some of the properties of this compound were described.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 734–736, March, 1989.     

Cationic cyclization of (α-furyl)- and (β-furyl)methyl derivatives of (±)-limonene

Cationic cyclization of the α- and β-furylmethyl (±)-limonene derivatives to give tricyclic furanoterpenoids, related to the metabolites of some marine organisms, was studied.     

Chemistry of natural compounds and bioorganic chemistry Synthesis of (±)-furodizinin and (±)-furodizin

The racemic forms of natural Omnoterpenoids, (±)-furodizinin and (±)-furodizin, were synthesized by cationic cyclization of the or -furylmethyl derivatives of linalool, geraniol and nerol.A. M. Moiseenkov (1936–1992), an outstanding Russian organic chemist, would have been sixty on July 6, 1996, He contributed significantly to the chemistry of terpenoids. The scientific heritage of A, M. Moiseenkov is rich and diversified. This work is devoted to the walizWon of one of his ideas. For the preliminary communication see Ref. 1.DeceasedTranslated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1842–1847, July, 1996.     

Interaction of low-energy neutrons with Nd isotopes

Low-energy neutron data for even-even isotopes 1^142–150Nd are considered. It is shown that the diffuseness parameter noticeably changes in going from one isotope to another (from a = 0.55 fm for ¹⁴²Nd to a = 0.75 fm for ¹⁵⁰Nd), which agrees with the theoretical indications of a decrease in the skin thickness for nuclei with closed shells. The analysis points to the possible existence of the semimagic number Z = 58.     

An inhomogeneously distorted state of the crystal structure of a Zn<Subscript>0.95</Subscript>Fe<Subscript>0.05</Subscript>Se cubic crystal

The structural state of a bulk Zn_0.95Fe_0.05Se cubic crystal grown by the chemical transport method from the gas phase has been investigated using thermal neutron diffraction at room temperature. It has been found that the measured neutron diffraction patterns of the crystal, in addition to structural Bragg peaks, contain a clearly identified system of superstructure reflections with the wave vector k = (1/3 1/3 1/3)2π/a (where a is the parameter of the cubic unit cell), which is interpreted as a clear evidence of the incipient transition state preceding the concentration phase transformation fcc ? hcp. It has been shown that the resulting structural state includes an inhomogeneous microstrain field with the possible appearance of long-wavelength modulations based on the initial sphalerite structure.     

Neutron Diffraction Characterization of the Microstrain Fields in the Dilute ZnSe:Co Magnetic Semiconductor Crystals

Physics of the Solid State - The real structure of the bulk Zn1&nbsp;–&nbsp;xCoxSe (x = 0.01, 0.15) cubic crystals has been characterized by thermal neutron scattering. The data on...     

Local lattice strains in the system of cubic Zn0.999Fe0.001S x Se1 − x (0 ≤ x ≤ 1) crystals

The structure of cubic Zn_0.999Fe_0.001S _x Se_{1 ? x} (0 ≤ x ≤ 1) crystals obtained by vapor-phase chemical transport has been investigated by thermal-neutron diffraction. The diffraction patterns of these crystals are found to exhibit previously unknown diffuse-scattering effects related to local static atomic displacements in the metastable fcc lattice. It is substantiated that the tendency to form polytypes, which is characteristic to a greater extent of zinc sulfide, can be a key factor of instability in the lattice of compounds belonging to the series of anion-substituted solid solutions under study.     

Superstructures in cubic A<Superscript>II</Superscript>B<Superscript>VI</Superscript> crystals heavily doped with Ni and V ions

Specific features of the crystal structure of bulk sphalerite-type Zn_0.9Ni_0.1S, Zn_0.9V_0.1Se, and Zn_0.997Ni_0.003Te crystals have been investigated in detail by thermal-neutron diffraction at room temperature. Fine effects (indicative of the existence of distortion microdomains, nucleation of long- and short-wavelength modulations, and tendencies toward local lowering of the symmetry based on the initial cubic structure) can be observed in the obtained scattering patterns. Various states preceding the fcc ? hcp phase transition have been revealed in these crystals. They depend on the elemental composition and are formed upon the reaction of the initial lattice to perturbations induced by foreign ions with an incomplete 3d shell.