Structure and Properties of a Novel 3D Straight-Channel Polyoxovanadate and an Unexpected Trimeric Barbiturate Obtained by Hydrothermal Reactions

Yang, Weishen; Lu, Can‐Zhong; Zhang, Quan-Zheng; Chen, Shumei; Zhan, Xiaoping; Liu, Jiu‐Hui

doi:10.1021/ic034554p

Cited by 35 publications

(11 citation statements)

References 40 publications

(24 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The formation of the barbituric acid trimer may be involve in oxidation of the enol form and then radical coupling. 30 The proposed mechanism of the formation of 16b by chemical method is shown in Scheme VI. The 1,3-dimethyl pyrimidine-2,4,5,6(1H,3H)-tetraone (1,3-dimethyl alloxan, 17b) was formed from the oxidation of 1,3-di-methyl barbituric acid 1b.…”

Section: Resultsmentioning

confidence: 99%

One‐pot New Barbituric Acid Derivatives Derived from the Reaction of Barbituric Acids with BrCN and Ketones

Hosseini

Rastgar

Heren

et al. 2011

J Chinese Chemical Soc

View full text Add to dashboard Cite

Reaction of cyclic b-dicarbonyl compounds such as pyrimidine-(1H,3H,5H)-2,4,6-trione (BA), 1,3dimethyl pyrimidine-(1H,3H,5H)-2,4,6-trione (DMBA) and 2-thioxo-pyrimidine-(1H,3H,5H)-4,6-dione (TBA) with cyanogen bromide in acetone and 2-butanone in the presence of triethylamine afforded a new class of stable heterocyclic spiro[furo[2,3-d]pyrimidine-6,5¢-pyrimidine]2,2¢,4,4¢,6¢(3H,3¢H,5H)-pentaones (dimeric forms of barbiturate) at 0°C and ambient temperature. Structure elucidation was carried out by X-ray crystallographic, 1 H NMR, 13 C NMR, two dimensional NMR, FT-IR spectra, mass spectrometry and elemental analysis. The mechanism of product formation is discussed. The reaction of DMBA with cyanogen bromide in the presence of triethylamine also afforded trimeric form of barbiturate of uracil derivatives in good yield. The reaction of selected acyclic b-dicarbonyl compounds with cyanogen bromide in the presence of triethylamine in acetone and/or diethyl ether has also been investigated under the same condition. Diethyl malonate and ethyl cyanoacetate brominated and also ethyl acetocetate both brominated and cyanated on active methylene via cyanogen bromide. Scheme I Reaction of cyclic b-dicarbonyls (1a-e)with cyanogen bromide and ketones (2)(3)(4)(5) in the presence of triethylamine Scheme II Proposed mechanism for the preparation of 6a as representative One-pot New Barbituric Acid DerivativesScheme III Knoevenagel condensation, Michael addition and cyclization mechanism for the formation of 7b as representative Scheme IV Reaction of 1b with cyanogen bromide in various ketones (2-5) in the presence of triethylamine for the synthesis of 16b

show abstract

Section: Resultsmentioning

confidence: 99%

One‐pot New Barbituric Acid Derivatives Derived from the Reaction of Barbituric Acids with BrCN and Ketones

Hosseini

Rastgar

Heren

et al. 2011

J Chinese Chemical Soc

View full text Add to dashboard Cite

show abstract

“…In spite of the numerous inorganic families and examples of magnetic openframework materials so far described along this review as well as their enormous progress experienced over the last 15 years, the search for new inorganic magnetic open-framework compounds can be still considered at an early stage. Indeed, recent examples of magnetic silicates, 202 germanates, 203 fluorides, 17,204 selenites, 205 polyoxovanadates, 206 sulfides 207 and oxochlorides 16 with open-framework structures seems to confirm such tendency by opening new and successful synthetic routes. From a magnetic point of view, most of them still behave as paramagnets with weak antiferromagnetic interactions at low temperatures.…”

Section: Sulfates the Interest For Magnetic Open-frameworkmentioning

confidence: 94%

Old materials with new tricks: multifunctional open-framework materials

2007

View full text Add to dashboard Cite

The literature on open-framework materials has shown numerous examples of porous solids with additional structural, chemical, or physical properties. These materials show promise for applications ranging from sensing, catalysis and separation to multifunctional materials. This critical review provides an up-to-date survey to this new generation of multifunctional open-framework solids. For this, a detailed revision of the different examples so far reported will be presented, classified into five different sections: magnetic, chiral, conducting, optical, and labile open-frameworks for sensing applications. (413 references.)

show abstract

“…The construction of porous POM materials is also possible using appropriate inorganic counter cations, and such all-inorganic POM materials are expected to be highly stable under thermal and redox conditions. All-inorganic POMs can be roughly divided into two types: (A) those utilizing ionic bonds or hydrogen bonds between clusters − and (B) those linking POMs with covalent bonds. − For type A POMs, several examples of aluminum cluster-paired POMs are known. Kwon et al reported all-inorganic porous POMs composed of a cationic aluminum cluster, [Al 13 O 4 (OH) 24 (H 2 O) 12 ] 7+ ({Al 13 } 7+ ), with [Al(OH) 6 Mo 6 O 18 ] 3– , or [V 2 W 4 O 19 ] 4– .…”

Section: Introductionmentioning

confidence: 99%

“…For type B POMs, Khan et al reported frameworks in which [V 18 O 42 (XO 4 )] 6– (X = V 5+ or S 6+ ) was cross-linked with [M(H 2 O) 4 ] 2+ (M = Co 2+ or Fe 2+ ) . Yang et al reported a material in which the [(P V O 4 )V V 6 V IV 12 O 39 ] 3– unit was directly linked through V–O–V bonds . Three-dimensional (3D) Keggin-type POM frameworks with K + and Na + were reported using [SiMo 12 O 40 ] 4– , [SiVW 11 O 40 ] 5– , or [BW 12 O 40 ] 5– .…”

Section: Introductionmentioning

confidence: 99%

Porous Cubic Cesium Salts of Silicododecatungstate(molybdate)/Borododecatungstate Blends: Synthesis and Molecular Adsorption Properties

et al. 2018

View full text Add to dashboard Cite

In this work, the synthesis and molecular adsorption properties of cubic cesium salts of Keggin-type silicododecametalates (SiM; M = W or Mo) and borododecatungstate (BW) blends were reported. Pentavalent BW, which is normally packed in a monoclinic fashion, could be packed into the desired cubic fashion by being blended with tetravalent SiW or SiMo. By simply mixing aqueous solutions containing SiM and BW in different SiM:BW molar ratios [SiM:BW = N:(100 - N), where N is the percentage of SiM in the synthetic solution and equals 100, 80, 50, 30, 20, 10, or 5] with a cesium nitrate solution, we obtained a series of cubic cesium salts (CsSiMBW- N) with POM vacancy-like pores (i.e., kinetically formed interparticle pores). Notably, the yields, compositions, and BET surface areas of the obtained CsSiMBW- N were dependent on only the N values and independent of SiW or SiMo. In CsSiMBW- N, SiM and BW were well blended at the molecular (nanometer) level. The nitrogen, water, and ethanol adsorption properties of CsSiWBW- N systematically changed according to the SiW:BW molar ratios. In the case of SiW-rich salts, nitrogen, water, and ethanol were adsorbed in the pores; the amounts of nitrogen, water, and ethanol adsorbed were nearly identical for CsSiWBW-100. When the SiW:BW molar ratio was decreased, the salts selectively incorporated water and ethanol within the pores. In the case of CsSiWBW-5, barely any nitrogen was adsorbed. The plausible mechanisms for particle growth and interparticle POM vacancy-like pore formation are also discussed.

show abstract

Structure and Properties of a Novel 3D Straight-Channel Polyoxovanadate and an Unexpected Trimeric Barbiturate Obtained by Hydrothermal Reactions

Cited by 35 publications

References 40 publications

One‐pot New Barbituric Acid Derivatives Derived from the Reaction of Barbituric Acids with BrCN and Ketones

One‐pot New Barbituric Acid Derivatives Derived from the Reaction of Barbituric Acids with BrCN and Ketones

Old materials with new tricks: multifunctional open-framework materials

Porous Cubic Cesium Salts of Silicododecatungstate(molybdate)/Borododecatungstate Blends: Synthesis and Molecular Adsorption Properties

Contact Info

Product

Resources

About