scholarly journals 10H-Pyrazino[2,3-b][1,4]benzotellurazine, a Novel Tellurium-Containing Heterocyclic System

2020 ◽  
Vol 2020 ◽  
pp. 1-5
Author(s):  
Diamond S. Smith ◽  
Dallas N. Alexis ◽  
Frank R. Fronczek ◽  
Thomas Junk
Keyword(s):  
Title Compound ◽  
Heterocyclic System ◽  
Crystallographic Analysis ◽  
Supramolecular Assemblies ◽  
Methyl Derivative ◽  
X Ray ◽  
Hydrogen Bonded

Condensation of 2,3-dichloropyrazine with 2-aminobenzenetellurole and 2-amino-5-methylbenzenetellurole, generated in situ by reduction of the corresponding ditellurides, resulted in the formation of novel 10H-pyrazino[2,3-b][1,4]benzotellurazine and its 7-methyl derivative. The products were purified via their well-crystallized 5,5-dibromo derivatives. X-ray crystallographic analysis of the title compound indicates that it has a pronounced V-shape and forms hydrogen-bonded dimers. Te, N-containing heterocycles have the potential of offering access to supramolecular assemblies.

A Novel Alkali-Metal Hydrido-tris(pyrazolyl)borate (Tp*) Complex. Isolation and Crystal Structure of [(Me2CO)3(NaTp*)2]

2014 ◽  
Vol 69 (7) ◽  
pp. 793-798
Author(s):  
Laurent Plasseraud ◽  
Hélène Cattey
Keyword(s):  
Crystal Structure ◽  
Alkali Metal ◽  
Sodium Hydroxide ◽  
Title Compound ◽  
Room Temperature ◽  
Crystallographic Analysis ◽  
Monoclinic Space Group ◽  
Large Excess ◽  
X Ray ◽  
Acetone Water

The title compound was isolated from the treatment of Tp*Sn(Cl)2Bu (1) with a large excess of sodium hydroxide in a mixture of acetone-water at room temperature. [(Me2CO)3(NaTp*)2] (2) crystallizes at 4 °C as prismatic colorless crystals, in the monoclinic space group P21/c with Z = 4, a = 12.2837(6), b = 24.3197(12), c = 16.9547(8) Å, β = 110.017(1)°, and V = 4759.0(4) Å3. The X-ray crystallographic analysis revealed a dinuclear unit in which two Tp*Na moieties are held together by three bridging acetone molecules acting as oxygen-based donors.

Hexaaquamanganese(II) bis[5-(4-nitrophenyl)tetrazolate]

2007 ◽  
Vol 63 (11) ◽  
pp. m2698-m2698 ◽  
Author(s):  
Bin Hu ◽  
Xiong-Bin Xu ◽  
Yong-Xiu Li ◽  
Heng-Yun Ye
Keyword(s):  
Title Compound ◽  
Hydrothermal Reaction ◽  
Hydrogen Bonded

The title compound, [Mn(H2O)6](C7H4N5O2)2, was obtained by the in situ hydrothermal reaction of MnCl2 with 4-nitrobenzonitrile in the presence of NaN3. The Mn atoms are located on inversion centres. The structure comprises hydrogen-bonded sheets of deprotonated 5-(4-nitrophenyl)tetrazole anions and hexaaquamanganese(II) cations.

The Crystal Structure of Dimethyl (1aα,2aα,5β,6aβ-Hexahydroazirino[2,1-b]benzoxazole-1a, 5(1H)-dicarboxylate

1991 ◽  
Vol 44 (8) ◽  
pp. 1145 ◽  
Author(s):  
MF Mackay ◽  
M Campbell ◽  
MJ Mcleish
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Crystallographic Analysis ◽  
Aminobenzoic Acid ◽  
X Ray ◽  
Relative Stereochemistry

The title compound formed the major component in a rearrangement of an analogue of 4-amino-4-deoxychorismic acid (1), an intermediate in the chorismate-p-aminobenzoic acid biotransformation. X-Ray crystallographic analysis has defined the relative stereochemistry at the four chiral centres in the tricyclic molecule.

scholarly journals Tetrahydro-1,4-thiazine-3,5-dione

Molbank ◽  
10.3390/m1036 ◽  
2018 ◽  
Vol 2018 (4) ◽  
pp. M1036 ◽  
Author(s):  
R. Aitken ◽  
Alexandra Slawin ◽  
Pei-pei Yeh
Keyword(s):  
Title Compound ◽  
Unit Cell ◽  
X Ray ◽  
Hydrogen Bonded

The X-ray structure of the title compound contains eight molecules in the unit cell which form the basis of a herringbone arrangement of hydrogen bonded ribbons.

scholarly journals Diastereoselective Synthesis of Spiro[Pyrrolo[2,1-B][1,3] Benzothiazole-3,5′-[1,3]Thiazolo[3,2-B][1,2,4]Triazol]-6′-Ones via Cycloaddition Reaction of Benzothiazolium Salts

2018 ◽  
Vol 42 (7) ◽  
pp. 371-373 ◽  
Author(s):  
Qing Zeng ◽  
Demin Ren ◽  
Yulin Huang ◽  
Xinliang Fu ◽  
Xiaofang Li
Keyword(s):  
Cycloaddition Reaction ◽  
Crystallographic Analysis ◽  
Azomethine Ylide ◽  
Dipolar Cycloaddition ◽  
Diastereoselective Synthesis ◽  
X Ray

The 1,3-dipolar cycloaddition reaction of (Z)-5-arylidene[1,3]thiazolo[3,2-b][1,2,4]triazol-6(5H)-one and azomethine ylide, which was generated in situ by the reaction of N-4-methoxyphenacylbenzothiazolium bromides and triethylamine, afforded novel 2-(aryl)-1-(4-methoxybenzoyl)-1,2-dihydrospiro[pyrrolo[2,1-b][1,3]benzothiazole-3,5′-[1,3]thiazolo[3,2-b][1,2,4]triazol]-6′-ones in moderate yields. The structures of all the products were characterised thoroughly by NMR, IR and HRMS spectroscopy together with X-ray crystallographic analysis.

scholarly journals 2-Deoxy-2-fluoro-2-C-methyl-D-ribono-1,4-lactone (fluoromethylrib)

2006 ◽  
Vol 62 (4) ◽  
pp. o1208-o1210
Author(s):  
Samuel Parker ◽  
David Watkin ◽  
Benjamin Mayes ◽  
Richard Storer ◽  
Sarah Jenkinson ◽  
...  
Keyword(s):  
Title Compound ◽  
Crystallographic Analysis ◽  
Ring Size ◽  
X Ray ◽  
Compound C ◽  
Relative Stereochemistry

The relative stereochemistry of the fluoro substituent (as ribo) and the ring size of the lactone (as five) in the title compound, C6H9FO4, have been established by X-ray crystallographic analysis.

Notizen: Preparation and Crystal Structure of the Hydrogen-Bonded Cyclic Dimer of PhP(S)[N(CH2Ph)2]OH, HN(CH2Ph)2+

1976 ◽  
Vol 31 (10) ◽  
pp. 1421-1422 ◽  
Author(s):  
T. Stanley Cameron ◽  
James D. Healy ◽  
Robert A. Shaw ◽  
Michael Woods
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Cyclic Dimer ◽  
X Ray ◽  
X Ray Crystallography ◽  
Hydrogen Bonded

The structure of the title compound was determined by X-ray crystallography. The compound is a cyclic dimer with short N···O and N···S contacts.

Structure Determination of Triplet Diphenylcarbenes by in Situ X-ray Crystallographic Analysis

2007 ◽  
Vol 129 (8) ◽  
pp. 2383-2391 ◽  
Author(s):  
Masaki Kawano ◽  
Katsuyuki Hirai ◽  
Hideo Tomioka ◽  
Yuji Ohashi
Keyword(s):  
Structure Determination ◽  
Crystallographic Analysis ◽  
X Ray

scholarly journals Diethyl pyrrole-2,5-dicarboxylate

Molbank ◽  
10.3390/m1117 ◽  
2020 ◽  
Vol 2020 (1) ◽  
pp. M1117
Author(s):  
R. Alan Aitken ◽  
Charles Bloomfield ◽  
Liam J. R. McGeachie ◽  
Alexandra M. Z. Slawin
Keyword(s):  
Title Compound ◽  
Ring Contraction ◽  
X Ray ◽  
Moderate Yield ◽  
Hydrogen Bonded

The title compound was obtained in moderate yield by a new and unexpected base-induced ring contraction from a 1,4-thiazine precursor. Its X-ray structure showing hydrogen bonded dimers was compared with those of other crystallographically characterised 2-acylpyrroles.

Manganiophosphonium-Salze: Synthese, Eigenschaften und Struktur von Komplexen des Typs [CpMn(CO)(NO)PPh2H]BF4 und [Cp′Mn(CO)(NO)PPh2R]X (R = H, CH3, {CpMn(CO)(NO)}; X = BF4, PF6)

2003 ◽  
Vol 58 (6) ◽  
pp. 553-562 ◽  
Author(s):  
Stefan Rudolph ◽  
Jan Geicke ◽  
Ingo Peter Lorenz ◽  
Thomas Seifert ◽  
Kurt Polborn ◽  
...  
Keyword(s):  
Starting Material ◽  
Reactive Intermediate ◽  
Phosphonium Salts ◽  
X Ray Diffraction ◽  
Methyl Derivative ◽  
X Ray ◽  
Phosphorus Ylide

The reaction of [Cp′Mn(CO)2NO]X (Cp = C5H5, C5H4Me = Cp′; X =BF4, PF6) with PPh2H leads to the formation of the diphenylmanganiophosphonium salts [{CpMn(CO)NO}PPh2H]X, which can be deprotonated by DABCO to give the not isolable manganiophosphane {CpMn(CO)NO}PPh2. This reactive intermediate, however, can be methylated by MeI and CF3SO3Me or organometallated by C5H5Fe(CO)2Cl to yield the phosphonium salts [{Cp′Mn(CO)NO}PPh2Me]PF6 and [{Cp′Mn(CO)NO}PPh2{C5H5Fe(CO)2}]PF6, respectively. The methyl derivative is deprotonated by πBuLi to give the unstable methylene phosphorane {Cp′Mn(CO)NO}PPh2=CH2, an organometallated phosphorus ylide. The in situ from [{Cp′Mn(CO)NO}PPh2H]BF4 generated phosphane {Cp′Mn(CO)NO}PPh2 is oxidized by epoxycyclohexane to give the intermediate oxophosphorane {Cp′Mn(CO)NO}P(O)Ph2, which reacts with the still available starting material to yield the first dimanganiodiphenylphosphonium salt [{Cp′Mn(CO)NO}2PPh2]BF4. The compounds have been characterized by spectroscopic (IR, NMR, MS), analytical (C, H, N) and X-ray diffraction investigations ([{C5H5Mn(CO)NO}PPh2H]BF4, [{Cp′Mn(CO)NO}PPh2Me]BF6, [{Cp′Mn(CO)NO}2PPh2]-BF4).

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