Synthesis and Properties of An Aminated hypocrellin B

Photodynamic therapy (PDT), using red light and photosensitizers (Sens ), is a promising new treatment for tumor. The naturally occurred hypocrellins,including hypocrellin A (HA) and hypocrellin B (HB,1), have been proposed as the potential photosensitizers for PDT. It has been the subject of many investigations to improve the red absorption and water-solubility of natural hypocrellins by the structural modifications1~3. In this paper, a new derivative 2 was synthesized from 1 and charact…     

Catalytic Film and Selective Oxidation of Iso-butylene

Selective oxidation is an important unit process in petrochemistry and fine chemical industry. As a thermodynamically profitable reaction, selective oxidation of hydro- carbons usually takes place with a lot of side-reactions and a great deal of reaction heat at high temperature. To prevent the side-reactions and accelerate heat exchanges are two principal aims in catalytic oxidation1. Using the catalytic film not only can remove the target products from the reaction area in time, but also avo…     

A New Method for Determination of Adsorption and Desorption Coefficients of Pesticides with Soil Column Liquid Chromatography

Agricultural chemicals such as pesticides were extensively applied in the fields. Pesticides effectively protect the crops, only as long as they remain in the root zone of soil. In case a portion of the chemicals leaves root zone and especially leaches through soil pores. They may pollute groundwater and be a serious environmental problem1. This problem has got widespread concern in the world. In soils the fate of organic compounds such as pesticides is governed by hydraulic transport coupled…     

In Vitro Interaction of Nicotine and Hemoglobin under Liver Cell Metabolizing Condition

Nicotine, 3-(1-methyl-2-pyrrolidinyl)pyridine, the main alkaloid in tobacco products, has been well known for its addiction effect. Habitual smokers are usually maintaining nicotine concentration constant in their blood at about 10-15 ng/mL1. Therefore the interaction of nicotine and hemoglobin (Hb) is essential to be studied. Our recent study by accelerator mass spectrometry (AMS) has shown that nicotine could form adducts with Hb after in vivo administration, and there is a positive dose r…     

Reduction of Elemental Selenium by Samarium Diiodide: the Synthesis of Dithiodiselenides and Dithioselenides

Selenium is an essential element in living organism. It is reported that the selenosulfides have been transported in vivo in glutathione or coenzyme-A1. It is also discovered in low concentration in garlic2. In organic synthesis, selenosulfides are useful intermediates3. Several methods for the formation of sulfur-selenium bond have been reported. For example, the compounds including S-Se bond were prepared by chloroamination of thiols and selenols4; by heating the selenocyanate with thiols5…     

Preparation and Properties of Oxidized Graphite Anode Doped with Metal Ion for Lithium Ion Batteries

During the past years, there have been a lot of interests in the research of carbonaceous material as anode in lithium ion batteries1-3. Among them, natural graphite seems to be the most promising candidate for anode in lithium-ion batteries in terms of economy. Figure 1 The effect of Different Contents Figure 2 The Effect of Reacting Timeof Mixed Acid on Interlayer Distance On Interlayer DistanceHowever the raw natural graphite cannot be used for commercial purposes, because during proc…     

Enantioselective Alternating Copolymerization of Propylene with Carbon Monoxide Using Cationic Palladium-Chiral Diphosphine Catalyst

Alternating copolymerization of (-olefins with carbon monoxide (CO) catalyzed by cationic palladium-chiral ligand complexes is of great interest due to the potential use of the resulting polymer as a new material1. Recently, enantioselective alternating copolymerization of CO with styrene has been reported by us using PdCl_2-CuCl2-chiral phosphine catalyst2. Here, we first report enantioselective alternating copolymerization of CO with propylene (P) using [(DDPPI)Pd(CH3CN)4](BF4)2 as …     

An Improved Method of Total Synthesis of 2-Methoxypodocarpane-8,11,13-triene

12-Methoxypodocarpane-8,11,13-triene 1 is the key intermediate for synthesis of some important diterpenoids, such as Ferruginol 21, 6,7-dehydroferruginol 31, sugiol 42, 5-epixanthoperol 53 etc. These compounds posses significant bioactivities, such as fungicidal1, antimicrobial1 and cytotoxic activity2. Some methods of synthesis of the title compound 1 were reported, but the process is laborious and the yield is low. In connection with our effort to discovery and develop new anti-HIV drugs, …     

Effects of the Specific Area and the Thermal Stability of a Polymer on the Catalytic Activities of Polymer Immobilized Co-Pd Catalysts by SAMI

Co-Pd bimetallic catalysts immobilized with four kinds of resins with different specific areas were prepared by means of the solvated metal atom impregnation (SMAI) method. The results of the XRD and the magnetic measurement showed that as the specific area of the resin increased, the particle sizes of Co and Pd on the catalysts with the same metal content decreased, so the catalytic activity of the catalysts for the hydrogenation of diacetone alcohol as well as the reduction of oxygen on the fuel cell electrode increased. Below 140 , the conversion of diacetone alcohol increased as the reaction temperature increased, and above 140 , the conversion decreased because of the rupture of the resin.