Studies on Hydroiodination and Deconjugation of 5—Aryloxy—（thiophenyl）—3—pentyn—2—one

One-pot hydroiodination and deconjugation of 5-aryloxy(or thiophenyl)-3-pentyn-2-one with a reagent system of sodium iodide/trimethylsilyl chloride/water in acetonitrile at 25℃ have been described.The plasuible mechanism was discussed.The reaction provided a simple and useful method for the preparation of (Z)-β-substituted β，γ-enones and (Z)-β-substituted α，β-unsaturated ketones.     

First principles calculation of the opto-electronic properties of (110) growth axis SiGe superlattices

Using two versions of the first principles full potential linear muffin-tin orbitals method (FPLMTO) which enable an accurate treatment of the interstitial regions, the electronic and optical properties of (110) growth axis Si/SiGe superlattices are investigated. A comparative study with (001) growth axis superlattices is made. In particular, it is found that the bottom of the conduction band (CB) is closer to Γ$\Gamma$ in the (110) system but the optical activity is not enhanced. Furthermore, the absorption spectra of the superlattices are calculated and are found to be quite different from those of bulk Si and Ge but fairly close to their average.     

Optically S-polarized surface waves in symmetrical nonlinear sensors: Thermal effects

A surface wave in a planar nonlinear waveguide is a current problem that has several applications in modern electronics and optics such as optical sensors design. The effect of thermal stress on the optical performance of a nonlinear symmetrical sensor is studied. The mathematical forms of the dispersion equation and thermal-stress sensitivity are analytically derived and plotted numerically. It is found that the thermal sensitivity of the sensor can be controlled by tuning the core size, by changing the loading materials, and by carefully selecting the materials.     

Electronic properties of cubic ScGaAs and ScGaN ternaries and superlattices

The electronic properties of both Sc_xGa_1−xAs and Sc_xGa_1−xN ternary alloy and superlattice systems are investigated within the first-principles full-potential linear muffin-tin orbitals method (FPLMTO) in its atomic sphere approximation (ASA) using the technique of empty spheres, which allows an accurate treatment of the interstitial regions. The phase transition from the rocksalt (B1) to the zinc blende (B3) structure is investigated and the possibility of zinc blende/zinc blende GaN/Sc_xGa_1−xN and GaAs/Sc_xGa_1−xAs superlattices is expected. Wide and direct gaps are found to be possible in these systems, predicting them as good candidates for optoelectronic applications.     

The Synthesis and the X‐Ray Structure of 1,4‐Bis(2‐{4‐[2‐(4‐methylthiophenyl)ethynyl]phenyl}ethynyl)‐2,5‐dihexyloxybenzene

The synthesis and the single crystal structure of the title compound (I), C₅₂H₅₀O₂S₂, consisting of five benzene rings and four carbon‐carbon triple bonds and with methylthio groups at both ends were described. The distance, according to the X‐ray data, between the two ended sulfur atoms of compound (I) was close to the calculated value from Spartan'04//Hartree‐Fock//3–21G(*). The dihedral angle between the adjacent two benzene rings in this linear conjugated molecule is about 17°.     

(Z)-2-苯氧(硫)基甲基-2-戊烯-γ-内酯和(Z)-2-苯氧(硫)亚甲基-γ-戊内酯的简便合成

以3-苯氧(硫)基丙炔(1)为原料,经5步反应合成(Z)-2-苯氧(硫)基甲基-2-戊烯-γ-内酯(8)和(Z)-2-苯硫亚甲基-γ-戊内酯(9).合成关键步骤为TMSCl/NaI/H2O/CH3CN体系中化合物(3)的碘氢化和去共轭.     

Transformation of Amides into Esters by the Use of Chlorotrimethylsilane

A mild transformation of various amides and imides into the corresponding esters and diesters in good yields by using chlorotrimethylsilane and alcohols at rt are described. Either primary, secondary, or tertiary amide or imide can be used in this transformation. Primary and secondary alcohols gave better yields than tertiary alcohols.     

Solvothermal Synthesis of Antimony Trioxide Sb2O3 Used as a Photocatalyst for Crystal Violet Dye Degradation

Moscow University Chemistry Bulletin - In the present research, antimony trioxide Sb2O3 particles have been successfully elaborated via solvothermal method and their photocatalytic ability for...     

Efficient Synthesis of Alkyl End‐Capped Oligoheterocycles via the Use of Palladacycle Catalyst

The preparation of mixed thiophene/furan oligomers with alkyl groups at α,α′‐position by the method which we discovered recently in our lab is presented. Thus, the mixed thiophene/furan oligomers can be prepared in good yields from monoiodoarene in the presence of 5 mol % of palladacycle catalyst and 1.2 equiv of N,N‐diisopropylethylamine in DMF at 100°C for 8 h.