Highly Sensitive Spectrofluorimetric Determination of Trace Amounts of Indium(Ⅲ) with Salicylaldehyde Salicyloylhydrazone

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｒｅｃｅｎｔｙｅａｒｓ ,ａｒｏｙｌｈｙｄｒａｚｏｎｅｓｗｈｉｃｈｃｏｎｔａｉｎｇｒｏｕｐ—ＣＯＮＨＮ ＣＨ—ｈａｖｅｂｅｅｎｔｅｓｔｅｄａｓｆｌｕｏｒｉ ｍｅｔｒｉｃｒｅａｇｅｎｔｓｆｏｒｔｈｅｄｅｔｅｒｍｉｎａｔｉｏｎｏｆａｌｕｍｉｎｕｍ ,ｇａｌｌｉｕｍ ,ｓｃａｎｄｉｕｍ ,ｚｉｎｃ ,ｃｏｐｐｅｒａｎｄｏｔｈｅｒｍｅｔａｌｉｏｎｓ[17] .Ｔｈｅｒｅａｃｔｉｏｎｏｆａｍｅｔａｌｉｏｎｗｉｔｈａｃｈｅｌａｔｉｎｇａｇｅｎｔｐｒｏｄｕｃｅｓａｒｉｇｉｄｍｏｌｅｃｕｌｅｗｉｔｈａ…     

Syntheses and Crystal Structures of 3,3'-(9,10-Anthrylene)bis-pentane-2,4-dione and 3-(2-Methoxy-1-naphthalenyl)-pentane-2,4-dione

1 INTRODUCTION 3-Substituted pentane-2,4-diones, as a series of chelating ligands to coordinate with many metal ions, have been extensively studied in coordination chemistry. These compounds can also act as valuable intermediates in the synthesis of calamitic derivatives both with or without metal ion[1]. However, compared to the 3-alkylation of 2,4-pentanediones, the direct synthesis of 3-aromatic pentane-2,4-diones from pentane-2,4- diones is much difficult. Previous methods to direc…     

Evolution of Morphology and Structure During Crystallization and Melting in Syndiotactic Polypropylene

Polypropylene( PP) has developed into one of the most useful plastic materials.Ithas many attractive properties,among them,a relatively low price.It also possesses awide range of possibilities for chemical modification[1 ,2 ] .The structure and morphologyof PP have a directimpacton the final properties. Therefore,there is growing interestinunderstanding the structure and morphology of stereoregular PP[1～ 6] .　For isotactic PP(i PP) ,extensive structural and morphological studies have be…     

Synthesis of 1-(3',4'-dihydroxyphenyl)-7-(4"-hydroxyphenyl)- 4hepten-3-one

Natural diarylheptanoids have significant bioactivities. Some of them are potent inhibitors against prostaglandin biosynthesizing enzyme (PG synthetase) and 5-lipoxygenase (LT synthetase)1-2. Compound 1 was firstly isolated from Alnus rubra bark3. So far its synthesis has not been reported yet. Herein, we report the synthesis of compound 1. Meantime, compound 24 was also obtianed as an intermediate. Compound 7 and 16 were converted to compound 10 and 18 respectively, because compound 1…     

Stepwise Oxidation of Ketene Dithioacetal

Ketene dithioacetals1-2 have demonstrated their potential for the synthesis of heterocycles, therefore, their synthesis and reactions have attracted much attention. The chemo- and stereo-selective conjugate addition of amine, organocuprate and Grignard reagent with ketene dithioacetal is well documented3-5, and we chose to examine whether the conjugate addition of the phosphite to the ketene dithioacetal occurs to afford the corresponding phosphonyl/S-methyl a-cyano(oxo, ethoxycarbonyl etc.) …     

A Convenient Synthesis of Diacyl Selenides by Selenium Transfer Reaction of Primary Selenoamides

Aryl selenoamides are rather interesting compounds because they are versatile intermediates in organic chemistry1. It was reported that selenobenzamides have been used as selenium transfer reagents in the synthesis of alkyl diselenides from reactive halides2. We began to investigate the reactivity of arylselenoamides toward acyl chlorides and guess that this reaction would produce acyl diselenides. In surprise we could not find the diacyl diselenides (Scheme 1). Instead diacyl selenides a…     

First Enantioselective Synthesis of (2R,3R)-and(2S,3S)-2-(4-hydroxyphenyl)-3-hydroxymethyl-1,4-benzodioxan-6-carbaldehyde

Numerous lignans containing 1,4-benzodioxane nucleus represent a class of natural products with cytotoxic and hepatoprotective activities1,2. Recently we have reported the racemic total synthesis of sinaiticin, a flavonolignan of the 1,4-benzodioxane type which was isolated from sinaiticum leaves found in sinai region of Egypt, using 2-(4-hydroxyphenyl)-3-hydroxymethyl-1,4-benzodioxan-6-carbaldehyde as the key interme-diate3,4. This species exhibits significant inhibitory activity against the …     

Active Oxygen Radical Scavenging Ability of Water-Soluble β-Alanine C_(60) Adducts

The bioactivity study of C60 and its relative derivatives is of considerable importance. Functional fullerenes have peculiar biological activities, such as enzymatic inhibition, anti-HIV activity, neuroprotection, antibacterial activity, DNA cleavage, and photodynamic therapy et al.1. Neuroprotective properties are based on the facts that functional fullerenes have antioxidant properties and high reactivity toward free radical2. Active oxygen radical in biological system mainly include…     

Dioxygen Affinity and Catalytic Performance of Bis-(furaldehyde) Schiff Bases Co(II) Complexes in Cyclohexene Oxidation

As mimetic oxygen carrier or oxidation catalyst, Schiff base cobalt complexes such as Co (II) salen have been widely studied1-4. However their high-price greatly limited their application. The synthesis of cheap furaldehyde Schiff bases and their complexes with Co (II), as well as the dioxygen affinity and biomimetic catalytic oxidation performance of these complexes are worth trying to study. In this paper, the saturated dioxygen uptake of cobalt complexes with different bis-(furaldehyd…     

On-Line Multichannel Raman Spectroscopic Detection System For Capillary Zone Electrophoresis

Detection and peak identification are key factors in developing CE (capillary electrophoresis) methodology. They have become hotspots for many reasons. The most obvious one lies in the revealing of unknown species in the application of CE to biological samples. CE-MS and CE-NMR have since been developed. CE-Raman spectroscopy was also reported1. As compared to the former two methods, the Raman spectroscopy method is highly attractive because it has the potential to provide high-informat…