The Laccase-Catalyzed Domino Reaction between Catechols and Heterocyclic 1,3-Dicarbonyls and the Unambiguous Structure Elucidation of the Products by NMR Spectroscopy and X-ray Crystal Structure Analysis

2009 ◽  
Vol 74 (19) ◽  
pp. 7230-7237 ◽  
Author(s):  
Szilvia Hajdok ◽  
Jürgen Conrad ◽  
Heiko Leutbecher ◽  
Sabine Strobel ◽  
Thomas Schleid ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Nmr Spectroscopy ◽  
Structure Analysis ◽  
Structure Elucidation ◽  
Crystal Structure Analysis ◽  
Domino Reaction ◽  
X Ray

Substituent effects in solution speciation of the mononuclear and dinuclear trimethylplatinum(iv) iodide complexes of pyridines

2015 ◽  
Vol 39 (5) ◽  
pp. 3536-3542 ◽  
Author(s):  
Biswa Nath Ghosh ◽  
Dieter Lentz ◽  
Sabine Schlecht
Keyword(s):  
Crystal Structure ◽  
Nmr Spectroscopy ◽  
Structure Analysis ◽  
Substituent Effects ◽  
Crystal Structure Analysis ◽  
X Ray ◽  
H Nmr ◽  
Pyridine Ligands ◽  
Solution Speciation

A series of mononuclear and dinuclear trimethylplatinum(iv) iodide complexes of pyridine ligands have been synthesized and characterized using 1H-NMR spectroscopy and X-ray crystal structure analysis.

Mononuclear and dinuclear trimethylplatinum(iv) iodide complexes of 3-substituted pyridines

2017 ◽  
Vol 41 (9) ◽  
pp. 3498-3507 ◽  
Author(s):  
Biswa Nath Ghosh ◽  
Sabine Schlecht ◽  
Antonio Bauzá ◽  
Antonio Frontera
Keyword(s):  
Crystal Structure ◽  
Nmr Spectroscopy ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
X Ray ◽  
H Nmr ◽  
Substituted Pyridines

A series of mononuclear and dinuclear trimethylplatinum(iv) complexes of 3-substituted pyridines has been studied by 1H NMR spectroscopy, DFT computational and X-ray crystal structure analysis.

Structure Elucidation of a Novel Analog of Sildenafil Detected as an Adulterant in a Dietary Supplement Using LC-UV and LC/MS

2012 ◽  
Vol 95 (4) ◽  
pp. 1048-1052 ◽  
Author(s):  
Miho Sakamoto ◽  
Takako Moriyasu ◽  
Keiko Minowa ◽  
Kiyoko Kishimoto ◽  
Hideo Kadoi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Electrospray Ionization ◽  
Dietary Supplement ◽  
Structure Analysis ◽  
Related Compound ◽  
Structure Elucidation ◽  
Crystal Structure Analysis ◽  
X Ray ◽  
Nmr Spectrometry

Abstract A sildenafil-related compound was detected in a dietary supplement marketed as an aphrodisiac. The compound was detected during analysis of the dietary supplement using LC-UV and LC/electrospray ionization-MS. The structure of the compound was established using high resolution MS, NMR spectrometry, and X-ray crystal structure analysis. The compound was identified as 5-(5-((3,5-dimethylpiperazin-1-yl)sulfonyl)-2-ethoxyphenyl)-1-methyl-7-((1-methyl-4-nitro-1H-imidazol-5-yl)thio)-3-propyl-1H-pyrazolo[4,3-d] pyrimidine. Based on this structure, the compound was named nitroprodenafil. The dietary supplement was found to contain 90 mg nitroprodenafil/capsule.

scholarly journals Preparative-scale HPLC Resolution of Metallacyclic η3-Allyltricarbonyliron Complexes and Determination of the Absolute Configuration by X-Ray Crystal Structure Analysis

1999 ◽  
Vol 23 (9) ◽  
pp. 578-579
Author(s):  
Rainer Schobert ◽  
Hermann Pfab ◽  
Jutta Böhmer ◽  
Frank Hampel ◽  
Andreas Werner
Keyword(s):  
Crystal Structure ◽  
Silica Gel ◽  
Structure Analysis ◽  
Absolute Configuration ◽  
Crystal Structure Analysis ◽  
Preparative Scale ◽  
X Ray ◽  
The Absolute

Racemates of (η3-allyl)tricarbonyliron lactone complex Fe(CO)3{η1:η3-C(O)XCH2CHCMeCH2} 1a (X = O) and (η3-allyl)tricarbonyliron lactam complex 2a (X = NMe) are resolved on a preparative scale by HPLC on cellulose tris(3,5-dimethylphenyl)carbamate/silica gel RP-8 and the absolute configuration of (-)-2a is determined by X-ray crystal structure analysis.

Second-Generation Inhibitors for the Metalloprotease Neprilysin Based on Bicyclic Heteroaromatic Scaffolds: Synthesis, Biological Activity, and X-Ray Crystal-Structure Analysis

2005 ◽  
Vol 88 (4) ◽  
pp. 731-750 ◽  
Author(s):  
Stefan Sahli ◽  
Brian Frank ◽  
W. Bernd Schweizer ◽  
François Diederich ◽  
Denise Blum-Kaelin ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Biological Activity ◽  
Structure Analysis ◽  
Second Generation ◽  
Crystal Structure Analysis ◽  
X Ray
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