New limonoids from the fruits of Melia toosendan

Two new limonoids,1α-tigloyloxy-3α-acetoxyl-7α-hydroxyl-12α-ethoxyl nimbolinin（1） and lα-benzoyloxy-3α-acetoxyl-7α- hydroxyl-12α-ethoxyl nimbolinin（2）,were isolated from the fruits of Melia toosendan.Their structures were established on the basis of various NMR spectroscopic analyses,including 2D-NMR techniques（HSQC,HMBC,NOESY） and HR-ESI-MS.

Synthesis,liquid crystalline and luminescent properties of trimeric phenylenevinylene with end-groups of(R)-(+)-2-methylbutyric acid ester

The trimeric phenylenevinylene with the symmetrical chiral end-groups （ChTPV） was synthesized. The liquid crystalline and luminescent properties of the ChTPV have been studied by differential scanning calorimetry （DSC）, polarized optical microscopy （POM）, absorption and photoluminescence spectra. The results indicated that the ChTPV exhibits mesophase over a wide temperature range and a typical optical texture of smectic phase. In contrast with the spectra of the solution, that of the film showed blue-shift in maximal absorption and red-shift in maximal emission due to H-type aggregation with parallel alignment of the TPV transition dipole moment.

Synthesis and Crystal Structure of a Novel Diorganotin(Ⅳ) Complex Containing 3,4-Difluorobenzohydroxamato Ligand

A new five-coordinate mixed-ligand compound, di-n-butyl（3,4-difluorobenzoxy）（3,4-difluorobenzohydroxamato）tin（Ⅳ） 1 was synthesized and characterized by IR, ^1H, ^13C, ^119Sn NMR spectra and single crystal X-ray diffraction technique.

Preparation and characterization of white bamboo charcoal PET fiber

Bamboo charcoal polyester fiber（BC-PET） has been widely applied in home textiles,functional clothing and hydra-balance material,due to their strong adsorptivity,good resolvability,anti-statics,deodorization,antibacterial,anion releasing and far infrared emitting.But BC-PET is black and difficult to be dyed,and its application is limited.In this article,nitric acid was used to treat the surface of bamboo charcoal（BC） powder,and BC powder was modified by titanium dioxide sol to prepare white bamboo charcoal（white-BC） particle.White bamboo charcoal polyester fiber（white-BC-PET） was obtained by mixing white-BC and polyester（PET） resin in double screw extruder.Performance of fiber was tested referring to national standard GB/T14464-2008 of common PET fiber and most of its indicators have already exceeded GB the level of excellent product.SEM photographs showed that the white-BC was uniformly distributed inside or on the surface of fiber.The white-BC-PET could absorb some aniline and had at least 90%anti-bacterial rate.The anti-bacterial rate could have almost been kept after it was washed 50 times.It was hopeful to be applied in various fields as functional fiber.

Diorgano, Dichloro-tin (IV) Complexes of 4-X-Benzohydroxamic Acid (X=Cl, OCH_3): Synthesis, Characterization, Antitumor Activity in Vitro and the Crystal Structure of trans- [Me_2Sn (L_2) _2]

A series of diorganotin (IV) derivatives of R2SnL2 (R = Me, Et, n-Bu, ph or Cl; L = L1 or L2) and their corresponding mixed-ligand complexes R2Sn (L1)(L2) have been prepared and the structure of trans-Me2Sn (L2) 2 was characterized by FT-IR, 1H, 13C and 119Sn NMR spectroscopies, MS, elemental analysis, melting points and X-ray diffraction. The structure-activity relationships were discussed.

A practical synthesis of a new series of isoflavanones

A practical six-step synthesis of 12 methylated and hydroxylated isoflavanones was accomplished starting from readily available m-xylene. A significant improvement of this procedure included application of the simple and commercially available reagents, avoidance of expensive reagents and catalysts, simple operations and excellent yields.