Simultaneous Spectrophotometric Determination of Trace Palladium and Rhodium with2，4－TADAT

ＳｉｍｕｌｔａｎｅｏｕｓＳｐｅｃｔｒｏｐｈｏｔｏｍｅｔｒｉｃＤｅｔｅｒｍｉｎａｔｉｏｎｏｆＴｒａｃｅＰａｌｌａｄｉｕｍａｎｄＲｈｏｄｉｕｍｗｉｔｈ２,４－ＴＡＤＡＴＺＨＡＮＧＸｉａｏ－ｌｉｎｇ;ａｎｄＺＨＡＮＧＧｕａｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈ...     

Synthesis and Structure of Schiff Base Complex Containing＇Cu_4O＇Core

ＳｙｎｔｈｅｓｉｓａｎｄＳｔｒｕｃｔｕｒｅｏｆＳｃｈｉｆｆＢａｓｅＣｏｍｐｌｅｘＣｏｎｔａｉｎｉｎｇ＇Ｃｕ＿４Ｏ＇ＣｏｒｅＭＡＣｈａｎｇ－ｑｉｎ￣＊,ＹＵＺｈｅｎｇ－ｇａｎｇ,ＺＨＡＮＧＷｅｎ－ｘｉｎｇ,ＷＡＮＧＸｕ－ｎｉｎｇａｎｄＪＩＡＮＧＤｅ－ｈ...     

Initiation Mechanism of Polymerization of Acryl－amide by Ceric Ion／2－Benzoyl Acetanilide System

ＩｎｉｔｉａｔｉｏｎＭｅｃｈａｎｉｓｍｏｆＰｏｌｙｍｅｒｉｚａｔｉｏｎｏｆＡｃｒｙｌ－ａｍｉｄｅｂｙＣｅｒｉｃＩｏｎ／２－ＢｅｎｚｏｙｌＡｃｅｔａｎｉｌｉｄｅＳｙｓｔｅｍＤＯＮＧＪｉａｎ－ｈｕａ，ＤＥＮＧＣｈａｏ，ＱＩＵＫｕｎ－ｙｕａｎａｎｄＦＥＮＧ...     

Detection of Catecholic Compounds with Field-ampilfied CZE-Amperometry

ＤｅｔｅｃｔｉｏｎｏｆＣａｔｅｃｈｏｌｉｃＣｏｍｐｏｕｎｄｓｗｉｔｈＦｉｅｌｄ－ａｍｐｉｌｆｉｅｄＣＺＥ－ＡｍｐｅｒｏｍｅｔｒｙＨＵＳｈｅｎ,ＰＡＮＧＤａｉ－ｗｅｎ,ＨＵＹｏｎｇ－ｇａｎｇ,ＣＨＥＮＧＪｉｅ－ｋｅ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓ...     

Crystal and Molecular Structure of Quinide

ＣｒｙｓｔａｌａｎｄＭｏｌｅｃｕｌａｒＳｔｒｕｃｔｕｒｅｏｆＱｕｉｎｉｄｅＷＡＮＧＧａｎｇ－Ｌｉ；ＺＨＡＯＳｈｕ－Ｊｉｅ；ＣＨＥＮＤｅ－Ｃｈａｎｇ（ＮａｔｉｏｎａｌＩｎｓｔｉｔｕｔｅｆｏｒｔｈｅＣｏｎｔｒｏｌｏｆＰｈａｒｍａｃｅｕｔｉｃａｌａｎｄＢｉ...     

Spectrophotometric Determination of Iron(Ⅱ) Diphosphine Carbonyl Compounds Using Charge-transfer Ban

ＳｐｅｃｔｒｏｐｈｏｔｏｍｅｔｒｉｃＤｅｔｅｒｍｉｎａｔｉｏｎｏｆＩｒｏｎ（Ⅱ）ＤｉｐｈｏｓｐｈｉｎｅＣａｒｂｏｎｙｌＣｏｍｐｏｕｎｄｓＵｓｉｎｇＣｈａｒｇｅ－ｔｒａｎｓｆｅｒＢａｎｄＬＩＳｏｎｇ－ｌａｎ,ＺＨＡＮＧＢａｏ－ｓｈｅｎ,ＷＡＮＧＺｈｉ－...     

Template Synthesis and Structure of Dinuclear Zinc Complex with Three Kinds of Pyrazole Ligands

ＴｅｍｐｌａｔｅＳｙｎｔｈｅｓｉｓａｎｄＳｔｒｕｃｔｕｒｅｏｆＤｉｎｕｃｌｅａｒＺｉｎｃＣｏｍｐｌｅｘｗｉｔｈＴｈｒｅｅＫｉｎｄｓｏｆＰｙｒａｚｏｌｅＬｉｇａｎｄｓＺＨＡＮＧＷｅｎ－Ｘｉｎｇ；ＭＡＣｈａｎｇ－Ｑｉｎ；ＷＡＮＧＸｕ－Ｎｉｎｇ；ＹＵＺｈｅ...     

Synthesis and Magnetic Properties of Binuclear Coblat（Ⅱ） Complexes with Alkoxide Bridge

ＳｙｎｔｈｅｓｉｓａｎｄＭａｇｎｅｔｉｃＰｒｏｐｅｒｔｉｅｓｏｆＢｉｎｕｃｌｅａｒＣｏｂｌａｔ（Ⅱ）ＣｏｍｐｌｅｘｅｓｗｉｔｈＡｌｋｏｘｉｄｅＢｒｉｄｇｅＹＡＮＳｈｉ－ｐｉｎｇ,ＰＥＮＧＪｉｕ－ｈｅ,ＬＩＡＯＤａｉ－ｚｈｅｎｇ,ＪＩＡＮＧＺｏｎｇ－ｈ...     

Study on the Total Synthesis of Hainanolide－Construction of Tricyclic Intermediate（I）

ＳｔｕｄｙｏｎｔｈｅＴｏｔａｌＳｙｎｔｈｅｓｉｓｏｆＨａｉｎａｎｏｌｉｄｅ－ＣｏｎｓｔｒｕｃｔｉｏｎｏｆＴｒｉｃｙｃｌｉｃＩｎｔｅｒｍｅｄｉａｔｅ（Ｉ）ＬｕＹａｎＺＨＡＮＧ；ＳｈｉＺｈｉＣＨＥＮ；ＤｏｎｇＷＥＩ；ＬｉａｎｇＨＵＡＮＧ；ＪｉＪｉｅＣＨＡ...     

The Electrochemistry of Cytochrome c at a Viologen-thiol Self-Assembled Monolayer

ＴｈｅＥｌｅｃｔｒｏｃｈｅｍｉｓｔｒｙｏｆＣｙｔｏｃｈｒｏｍｅｃａｔａＶｉｏｌｏｇｅｎ－ｔｈｉｏｌＳｅｌｆ－ＡｓｓｅｍｂｌｅｄＭｏｎｏｌａｙｅｒＬＩＪｉｎｇ－ｈｏｎｇ,ＣＨＥＮＧＧｕａｎｇ－ｊｉｎ,ＤＯＮＧＳｈａｏ－ｊｕｎ（ＬａｂｏｒａｔｏｒｙｏｆＥ...     

Preparative synthesis of ethyl 5-acyl-4-pyrone-2-carboxylates and 6-aryl-, 6-alkyl-, and 5-acylcomanic acids on their basis

A simple and efficient method for the synthesis of ethyl 5-alkanoyl- and 5-aroyl-4-pyrone-2-carboxylates was developed, which is based on the condensation of 1-R-2-(dimethyl-aminomethylidene)butane-1,3-diones, obtained from 1,3-diketones and dimethylformamide dimethyl acetal, with diethyl oxalate in the presence of NaH in THF. Ethyl 5-acyl-4-pyrone-2-carboxylates were used in the synthesis of 6-R- and 5-RCO-comanic acids.     

1,2,3-Triazolodiazepines. I. Preparation and benzodiazepine receptor binding of 1-benzyl- and 1-phenethyl-1,2,3-triazolo-[4,5-b][1,4]diazepines

Several new 1,2,3-triazolo[4,5-b][1,4]diazepines were prepared starting from 1-benzyl-1 and 1-phenethyl-4,5-diamino-1,2,3-triazole 2 (Scheme 1), by condensation reactions with β-diketones (Scheme 2), β-ketoesters (Scheme 3), and diethyl malonates (Scheme 4). In the first case we obtained compounds 3 and 4 with basic properties, while the ester function condensations gave cyclic amide derivatives 7, 8, 10, 12 and 13 with acid properties. Some N-methyl derivatives 11, 14 and 15 were obtained from the cyclic amide compounds. Most of compounds were tested for their ability to displace [³H]flunitrazepam from bovine brain membranes but no compound showed benzodiazepine receptor binding affinity.     

Reaction of substituted benzylideneacetylacetones with hydroxylamine hydrochloride

The reaction of α,β-unsaturated β-diketones, such as 3-(o-chloro, m-nitro, and o-nitrobenzylidene)acetylacetones (I, II, and III) with hydroxylamine hydrochloride was carried out. Among them, compound I and II in acetonitrile, methanol, and acetic acid afforded 4-(α-hydroxy, methoxy, acetoxy, and chlorobenzyl)-3,5-dimethylisoxazoles (IV-XI) in fairly good yield. On the other hand, III yielded 3-(3′,5′-dimethylpyrazolo)-5-chloroanthranil (XV) under the almost same conditions by the participation of o-nitro group.     

Synthesis of 4H-pyrans by O-cyclization of 1,5-diketones

Substituted 4H-pyrans were obtained in high preparative yields by the reaction of 1,5-diketones with acetic anhydride and boron trifluoride etherate in diethyl ether. It is assumed that the heterocyclization of 1,5-diketones includes a step involving the formation and transformations of an acyloxy carbonium ion.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 320–322, March, 1992.     

Synthesis of 4-(1-adamantyl)-3-polyfluoromethyl-1<Emphasis Type="Italic">H</Emphasis>-pyrazoles

4-(1-Adamantyl)-3-polyfluoromethylpyrazoles were synthesized for the first time in high yields by condensation of fluorinated 2-(1-adamantyl)-1,3-diketones with hydrazine hydrate.     

A Facile Preparation of 2-Arylethenephosphonates

Vinylphosphonates 3 could be prepared with E-selectivity by the condensation of diethyl methylphosphonate 1 with a series of carbonyl compounds using diethyl chlorophosphate.     

Synthesis and study of the reactions of 2,5- and 1,2,5-substituted 6-aminoindoles

It has been shown that nitration with a KNO₃ + H₂SO₄ mixture of 2,5-dimethyl- and 5-methyl-2-phenylindoles proceeds strictly selectively with the formation of 6-nitro derivatives, by reduction of which the corresponding aminoindoles were synthesized. It was established that the condensation of the aminoindoles obtained with β-diketones leads initially to enamino ketones, which in the presence of various acidic reagents are not subject to cyclization, i.e. may not be used for the synthesis of the corresponding pyrroloquinolines.     

Synthese und Eigenschaften von Spiro[1,3-benzodioxol-2,3′-pyrrolidin]

Spiro[1,3-benzodioxole-2,3′-pyrrolidine] was synthesized in several steps from ethyl 2-ethoxycarbonyl-1, 3-benzodioxole-2-acetate, prepared by condensation of pyrocatechol with either diethyl meso-dibromosuccinate, diethyl acetylenedicarboxylate or diethyl bromo maleate. The structural factors leading to the formation of the benzodioxole rather than the benzodioxan and some possible reaction mechanisms are discussed.     

Studies of the condensation of sulfones with ketones and aldehydes

[reaction: see text] The condensation of ketones or aldehydes with sulfones was shown to give a variety of products. Condensation of 2-methylcyclohexanone with dimethyl sulfone using potassium t-butoxide as base gave useful yields of 1,2-dimethylenecyclohexane. Under the same conditions, cycloheptanone, 3-methyl-2-butanone, and 2-butanone were converted to dienes. Remarkably, these reaction conditions converted acetophenone into p-terphenyl (10%) and (E)-1,4-diphenyl-3-penten-1-one (44%). Propiophenone was converted to 2'-methyl-p-terphenyl (61%). Using alpha-tetralone produced 1-methynaphthalene and naphthalene. No reaction took place with beta-tetralone. Using diethyl sulfone with alpha-tetralone lead to pure naphthalene. Condensation of isobutyraldehyde and dimethyl sulfone using potassium t-butoxide gave isoprene in low yield. Using benzaldehyde and benzyl phenyl sulfone in N,N-dimethylacetamide gave 1,2-diphenyl-1-phenylsulfonylethylene, N,N-dimethylcinnamide, and a complex condensation product. Only 1,2-diphenyl-1-phenylsulfonylethylene was obtained when the solvent was THF.     

Synthesis of dimethoxybenz[g]isoquinolines

Stobbe condensation of 2,3-dimethoxybenzaldehyde with diethyl succinate, followed by reduction and cyclization, gave 3-carbethoxy-5,6-dimethoxy-l-tetralone (7a). Subsequent reduction, aromatization and side chain conversion yielded the key intermediate 7,8-dimethoxy-2-naphthalenecarboxaldehyde (8c). 6,7-Dimethoxybenz[g]isoquinoline (1) was prepared from 8c via condensation with nitromethane, reduction, formylation, cyclization, and aromatization reactions; the isomeric 8,9-dimethoxybenz[g]isoquinoline (2) was obtained by the condensation of 8c with the diethyl acetal of aminoacetaldehyde (12) followed by reduction, tosylation, cyclization and aromatization. The methiodides of both compounds were also prepared.