X-ray and Nuclear Magnetic Resonance (NMR) Studies of Signalizing the Tripeptide Sequence (Tyr-D-Ala-Phe) of Dermorphin and Deltorphins I and II. Comparative Analysis in the Liquid and Solid Phases

2004 ◽  
Vol 108 (14) ◽  
pp. 4535-4545 ◽  
Author(s):  
Mikołaj M. Słabicki ◽  
Marek J. Potrzebowski ◽  
Grzegorz Bujacz ◽  
Sebastian Olejniczak ◽  
Jacek Olczak
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Comparative Analysis ◽  
Magnetic Resonance ◽  
Nmr Studies ◽  
X Ray ◽  
Solid Phases ◽  
Liquid And Solid Phases ◽  
Nuclear Magnetic

Stereospecific synthesis, 1H and 13C NMR spectroscopy, and X-ray crystallographic studies of 6,6-dibromo-3α-cyano-2,2-dimethylpenam-(1R)-S-oxide

1991 ◽  
Vol 69 (3) ◽  
pp. 578-583 ◽  
Author(s):  
Claudio J. Salomon ◽  
Oreste A. Mascaretti ◽  
Charles E. Strouse ◽  
G. Punte
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Single Crystal ◽  
Crystal Packing ◽  
Stereospecific Synthesis ◽  
Nmr Studies ◽  
X Ray ◽  
Cell Parameters ◽  
Penicillin Sulfoxide ◽  
Nuclear Magnetic

A stereospecific synthesis of 6,6-dibromo-3α-cyano-2,2-dimethylpenam-(1R)-S-oxide (2) is described. The X-ray single crystal investigation of this compound shows that it crystallizes in the monoclinic system, space group P21, with cell parameters a = 6.194(1), b = 9.363(1), c = 9.869(1) Å, β = 96.55(2)°, V = 568(1) Å3, and two molecules per unit cell. Thestructure was solved, from low temperature data, by direct methods, and refined, by least-squares procedures, to a final R = 3.17%, Rw = 3.38%, for 1221 observed independent reflections. The sulfoxide configuration is R. The thiazolidine presents an envelope shape with the C(3) atom 0.56 Å above the other four members of the ring mean plane. Therefore, it exhibits the conformation with α-CH3 pseudoequatorial and β-CH3 and α-CN both pseudoaxial. This conformation is different from the one reported for other penicillin sulfoxide derivatives. The geometry of the β-lactam ring is typical of the fused bicyclic penam nucleus. The ring is non-planar. The N(4) atom displays a pyramidial arrangement. The examination of crystal packing shows that molecules along a are connected by a short C—H … O contactReported single crystal studies showed two dominant conformations for the thiazolidine ring in the fused bicyclic penam nucleus: the C(3) or 2β-3α substituents both pseudoaxial, as found in 2, and the S(1) or 2β-3α substituents both pseudoequatorial, adopted by most sulfoxides. Neither of these conformations can explain the nuclear Overhauser effect data. A conformation with the substituents C2-β-methyl-C3-α-H and C2-α-methyl-C3-α-CN fully eclipsed is in accordance with the experimental results in the solution. The 1H nuclear magnetic resonance data reflect the influence of the magnetic anisotropy of the CN triple bond on the gem-dimethyl groups, particularly in relation with the geometrical features of the molecule. Comparison of 13C nuclear magnetic resonance chemical shifts for 2 and its parent penicillin sulfide (1) indicates configurationally dependent substituent effects, the magnitude of which can be used for the stereochemical assignment of sulfoxide groups in this series. Key words: penicillin sulfoxide derivatives, di-halogen penicillanates, stereospecific synthesis, NMR studies, absolute configuration determination.

Fluorine‐19 Nuclear Magnetic Resonance of the Liquid and Solid Phases of Fluorine

1971 ◽  
Vol 54 (10) ◽  
pp. 4194-4199 ◽  
Author(s):  
D. E. O'Reilly ◽  
E. M. Peterson ◽  
D. L. Hogenboom ◽  
C. E. Scheie
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Solid Phases ◽  
Liquid And Solid Phases ◽  
Nuclear Magnetic

Direct Characterization of Kerogen by X-ray and Solid-State13C Nuclear Magnetic Resonance Methods

2007 ◽  
Vol 21 (3) ◽  
pp. 1548-1561 ◽  
Author(s):  
S. R. Kelemen ◽  
M. Afeworki ◽  
M. L. Gorbaty ◽  
M. Sansone ◽  
P. J. Kwiatek ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
X Ray ◽  
Nuclear Magnetic

X-Ray crystallographic and 13C nuclear magnetic resonance studies of 3,4,5,6-tetrahydro-2H-1,3,4-oxadiazin-2-ones derived from ephedrine and pseudoephedrine

Tetrahedron ◽  
2001 ◽  
Vol 57 (49) ◽  
pp. 9789-9798 ◽  
Author(s):  
Shawn R Hitchcock ◽  
George P Nora ◽  
David M Casper ◽  
Michael D Squire ◽  
Christopher D Maroules ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Studies ◽  
X Ray ◽  
13C Nuclear Magnetic Resonance ◽  
Nuclear Magnetic
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