Structural studies of N-(2′-substituted phenyl)-9,10-dihydro-9,10-ethanoanthracene-11,12-dicarboximides by X-ray diffraction and NMR spectroscopy—proofs for CH/π interactions in liquid and solid phases

2003 ◽  
Vol 27 (7) ◽  
pp. 1095-1101 ◽  
Author(s):  
Gisbert Grossmann ◽  
Marek J. Potrzebowski ◽  
Sebastian Olejniczak ◽  
Natasza E. Ziółkowska ◽  
Grzegorz D. Bujacz ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Structural Studies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Π Interactions ◽  
Solid Phases ◽  
Liquid And Solid Phases

scholarly journals Internal dynamics in helical molecules studied by X-ray diffraction, NMR spectroscopy and DFT calculations

2017 ◽  
Vol 19 (4) ◽  
pp. 2900-2907 ◽  
Author(s):  
Martin Dračínský ◽  
Jan Storch ◽  
Vladimír Církva ◽  
Ivana Císařová ◽  
Jan Sýkora
Keyword(s):  
Nmr Spectroscopy ◽  
Dft Calculations ◽  
X Ray Diffraction ◽  
Internal Dynamics ◽  
X Ray ◽  
Solid Phases ◽  
Helical Molecules

Unexpected flexibility of helical molecules is observed both in solution and solid phases.

Structural studies of homoisoflavonoids: NMR spectroscopy, X-ray diffraction, and theoretical calculations

2010 ◽  
Vol 979 (1-3) ◽  
pp. 172-179 ◽  
Author(s):  
Elina Sievänen ◽  
Jaromír Toušek ◽  
Kamila Lunerová ◽  
Jaromír Marek ◽  
Dagmar Jankovská ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Theoretical Calculations ◽  
Structural Studies ◽  
X Ray Diffraction ◽  
X Ray

Advances in Structural Studies on Alkylaluminum Species in the Solid State via Challenging 27Al–13C NMR Spectroscopy and X-ray Diffraction

2013 ◽  
Vol 117 (35) ◽  
pp. 18091-18099 ◽  
Author(s):  
Frédérique Pourpoint ◽  
Yohann Morin ◽  
Régis M. Gauvin ◽  
Julien Trébosc ◽  
Frédéric Capet ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
13C Nmr ◽  
13C Nmr Spectroscopy ◽  
Structural Studies ◽  
X Ray Diffraction ◽  
X Ray

Ribosome Structural Organization

1974 ◽  
Vol 32 ◽  
pp. 332-333
Author(s):  
James A. Lake
Keyword(s):  
Ribosomal Proteins ◽  
Structural Organization ◽  
Three Dimensional ◽  
Small Subunit ◽  
Structural Studies ◽  
X Ray Diffraction ◽  
Specific Antibodies ◽  
X Ray ◽  
E Coli ◽  
Complete Sequences

The understanding of ribosome structure has advanced considerably in the last several years. Biochemists have characterized the constituent proteins and rRNA's of ribosomes. Complete sequences have been determined for some ribosomal proteins and specific antibodies have been prepared against all E. coli small subunit proteins. In addition, a number of naturally occuring systems of three dimensional ribosome crystals which are suitable for structural studies have been observed in eukaryotes. Although the crystals are, in general, too small for X-ray diffraction, their size is ideal for electron microscopy.

An unusual reaction of a bridged triterpenoid α-diketone with acetic anhydride

1991 ◽  
Vol 56 (12) ◽  
pp. 2917-2935 ◽  
Author(s):  
Eva Klinotová ◽  
Václav Křeček ◽  
Jiří Klinot ◽  
Miloš Buděšínský ◽  
Jaroslav Podlaha ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Nmr Spectroscopy ◽  
Acetic Anhydride ◽  
Spectral Methods ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mild Conditions ◽  
Condensation Products ◽  
Unsaturated Lactones ◽  
C Nmr

3β-Acetoxy-21,22-dioxo-18α,19βH-ursan-28,20β-olide (IIIa) reacts with acetic anhydride in pyridine under very mild conditions affording β-lactone IVa and γ-lactones Va and VIIa as condensation products. On reaction with pyridine, lactones Va and VIIa undergo elimination of acetic acid to give unsaturated lactones VIIIa and IXa, respectively. Similarly, the condensation of 20β,28-epoxy-21,22-dioxo-18α,19βH-ursan-3β-yl acetate (IIIb) with acetic anhydride leads to β-lactone IVb and γ-lactone Vb; the latter on heating with pyridine affords unsaturated lactone VIIIb and 21-methylene-22-ketone Xb. The structure of the obtained compounds was derived using spectral methods, particularly 1H and 13C NMR spectroscopy; structure of lactone IVa was confirmed by X-ray diffraction.

Unusual Rearrangement of Naphthalene in the Synthesis of a Novel B8-B8-Bridged Derivative in the [(1,2-C2B9H11)2-3-Co]- Series. X-Ray Structure and 11B NMR Spectra of [8,8'-μ-(CH2-C9H6)-(1,2-C2B9H10)2-3-Co]- (CH3)4N+

1997 ◽  
Vol 62 (5) ◽  
pp. 746-751 ◽  
Author(s):  
Andreas Franken ◽  
Jaromír Plešek ◽  
Christiane Nachtigal
Keyword(s):  
Nmr Spectroscopy ◽  
Single Crystal ◽  
Nucleophilic Substitution ◽  
Nmr Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Unusual Rearrangement ◽  
Multinuclear Nmr Spectroscopy ◽  
11B Nmr ◽  
Isolated Compound

On treatment of the [(1,2-C2B9H11)2Co]- ion with naphthalene in presence of AlCl3 a remarkably bridged [8,8'-μ-(CH2-C9H6)-(1,2-C2B9H10)2-3-Co]- ion is obtained as a single isolated compound. The triatomic -CH2-C9H6- bridge is derived from the rearranged naphthalene nucleus. The mechanism of this reaction is obscure but it does resemble the "Electrophile-Induced Nucleophilic Substitution" reported earlier. The structure of the compound was established by multinuclear NMR spectroscopy and by single crystal X-ray diffraction.

Ten-Vertex Polyhedral Monocarbaborane Chemistry. The Novel High-Yield Formation of the Ten-Vertex closo Compound [6-(PMe2Ph)-closo-1-CB9H9] from the Thermolysis of [8,8-(PMe2Ph)2-nido-8,7-PtCB9H11]

1993 ◽  
Vol 58 (12) ◽  
pp. 2924-2935 ◽  
Author(s):  
Jane H. Jones ◽  
Bohumil Štíbr ◽  
John D. Kennedy ◽  
Mark Thornton-Pett
Keyword(s):  
Nmr Spectroscopy ◽  
Diffraction Analysis ◽  
High Yield ◽  
Monoclinic Space Group ◽  
The Novel ◽  
X Ray Diffraction ◽  
Metal Centre ◽  
X Ray ◽  
Yield Formation ◽  
Boiling Toluene

Thermolysis of [8,8-(PMe2Ph)2-nido-8,7-PtCB9H11] in boiling toluene solution results in an elimination of the platinum centre and cluster closure to give the ten-vertex closo species [6-(PMe2Ph)-closo-1-CB9H9] in 85% yield as a colourles air stable solid. The product is characterized by NMR spectroscopy and single-crystal X-ray diffraction analysis. Crystals (from hexane-dichloromethane) are monoclinic, space group P21/c, with a = 903.20(9), b = 1 481.86(11), c = 2 320.0(2) pm, β = 97.860(7)° and Z = 8, and the structure has been refined to R(Rw) = 0.045(0.051) for 3 281 observed reflections with Fo > 2.0σ(Fo). The clean high-yield elimination of a metal centre from a polyhedral metallaborane or metallaheteroborane species is very rare.

Equilibrium,1H and13C NMR Spectroscopy, and X-ray Diffraction Studies on the Complexes Bi(DOTA)-and Bi(DO3A-Bu)

2003 ◽  
Vol 42 (7) ◽  
pp. 2342-2349 ◽  
Author(s):  
Éva Csajbók ◽  
Zsolt Baranyai ◽  
István Bányai ◽  
Ernő Brücher ◽  
Róbert Király ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
X Ray Diffraction ◽  
1H And13c Nmr ◽  
X Ray ◽  
1H And13c Nmr Spectroscopy
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