Synthesis of functionally-substituted 2-phenyl(2-furyl)-1,3,4-oxadiazine hydrobromides from benzoyl(2-furoyl)hydrazines and 1,3-dibromopropyne

The reaction of benzoyl(2-furoyl)hydrazines with 1,3-dibromopropyne on heating in acetonitrile in 1:1 or 1:2 ratio of the reagents gave exclusively substituted 2-phenyl(2-furyl)-1,3,4-oxadiazine hydrobromides. __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, 1555–1557, October, 2006.     

非对称同位素替代分子HD、HT和DT分子与氦原子(E=0.1 eV) 碰撞角分布计算

当入射氦原子能量E=0.1 eV时,用密耦方程(Close Coupling Equation)计算非对称同位素替代分子HD、DH-He碰撞的弹性和非弹性散射的角分布.     

长链烷基锂与6,6-二烷基富烯的反应研究——取代茂钛、锆化合物的合成

研究了正庚基锂、正辛基锂同6,6-二烷基富烯反应的立体和溶剂效应对反应类型的影响。在弱极性溶剂中(方法A,B),正庚基锂、正辛基锂同6,6-二烷基富烯主要发生加成反应;在极性溶剂中(方法C),则倾向于加成和还原两种反应。利用上述反应形成的环戊二烯基阴离子同TiCl₄、ZrCl₄反应,合成了一系列新的取代茂钛、锆化合物。     

Substituted thienyl stibines and bismuthines: syntheses,structures and cytotoxicity

New stibine and bismuthine substituted thienyl ring compounds, i.e. tris(3‐methyl‐2‐thienyl)stibine (1), tris(3‐methyl‐2‐thienyl)bismuthine (2), tris(3‐thienyl)stibine (3), tris(3‐thienyl)bismuthine (4) and tris(5‐chloro‐2‐thienyl)stibine (5), have been synthesized and characterized by IR, mass, ¹H, ¹³C, COSY, and HETCOR NMR spectroscopy. The metal centres in all compounds are pyramidal, and molecules in the stibine compound (1) and bismuthine compound (2) associate via Sb···S or Bi···S interactions to form supramolecular chains. The cytotoxicity of compounds 1 and 5 was determined. For compound 5, 85% of carcinogenic cell growth inhibition (U, K and H) was observed. Compound 1 shows a significant selectivity (>80%) for carcinogenic cell growth (K and U) inhibition. Both the compounds are highly toxic for the growth of normal lymphocytes with ～95% lethality. Compound 1 is approximately 20 times more toxic than 5 against Artemia salina. Copyright © 2005 John Wiley & Sons, Ltd.     

A Simple and Efficient Method for the Oxidation of Aryl Substituted Semicarbazide with NaNO2/NaHSO4·H2O/SiO2 under Mild Conditions

In this paper, eighteen aryl substituted semicarbazide underwent efficient oxidation to aryl azo compounds using NaNO₂/NaHSO₄·H₂O/SiO₂ under mild conditions with excellent yields.     

衰减全反射磁镜偏频激光陀螺的理论分析

通过分析常规磁镜在红光波长下制造激光陀螺技术不可行的原因，提出了一种新型的磁镜偏频激光陀螺结构，其核心是利用全内反射结构和掺杂YIG薄膜的横向克尔磁光效应作为偏频技术去克服闭锁的衰减全反向磁镜。     

Kinetics and mechanism of the reaction of substituted benzyl bromides with copper in dimethylformamide

The reaction of copper metal with various substituted benzyl bromides in dimethylformamide has been studied and the kinetic and thermodynamic parameters of the reaction have been obtained. Hammett plots of log(k/k°) vs the substituent constant σ gave good correlations (ρ = 0.24, S_ρ = 0.03, r = 0.951). The structure of the organic group has little effect on the rate of reaction of substituted benzyl bromides with copper. In the absence of atmospheric oxygen, oxidative dissolution of copper occurred by the mechanism of single‐electron transfer with the formation of 1,2‐diphenylethanes and copper(I) complexes. The stereochemistry and intermediate compound were also studied and the reaction mechanism is discussed. Copyright © 2005 John Wiley & Sons, Ltd.     

Poly(alkylthio‐p‐phenylenevinylene): Synthesis and electroluminescent and photovoltaic properties

Two alkylthio‐substituted poly(p‐phenylenevinylene) (AT–PPV) derivatives, poly(2‐octylthio‐p‐phenylenevinylene) (OT–PPV) and poly[5‐methoxy‐2‐(2′‐ethyl‐hexylthio)‐p‐phenylenevinylene] (MEHT–PPV), were synthesized by a Heck coupling reaction for the investigation of the effect of alkylthio groups on the optoelectronic properties of poly(p‐phenylenevinylene) derivatives. The absorption peaks of OT–PPV and MEHT–PPV solutions were located at 431 and 438 nm, respectively. As for solid films, an OT–PPV film showed an absorption maximum wavelength at 444 nm, 13 nm redshifted in comparison with its solution value, whereas an MEHT–PPV film displayed the same absorption peak position as its dilute solution; this indicated that there was no interchain interaction in the MEHT–PPV film. Polymeric light‐emitting diodes (PLEDs) and polymer solar cells (PSCs) based on OT–PPV and MEHT–PPV were fabricated and characterized. Very narrow bandwidths of the electroluminescence (EL) spectra of the two AT–PPVs were found, with the full width at half‐maximum of the emission being 40 and 47 nm for OT–PPV and MEHT–PPV, respectively. The maximum EL efficiency of the single‐layer PLED based on MEHT–PPV with Al as a cathode reached 1.49 cd/A. The PSC based on a blend of OT–PPV and [6,6]‐phenyl‐C₆₁ butyric acid methyl ester (PCBM) showed the power conversion efficiency of 1.4% under the illumination of AM1.5 (80 mW/cm²). © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 1279–1290, 2006