1H NMR spectral analysis of physalin A, a 13,14-seco-16,24-cyclosteroid, based on crystal structure of (25R)-2,3,25,27-tetrahydrophysalin a dimethanol solvate

1992 ◽  
Vol 22 (2) ◽  
pp. 131-137 ◽  
Author(s):  
Masao Kawai ◽  
Tooru Taga ◽  
Yoshihisa Miwa ◽  
Yasuo Butsugan
Keyword(s):  
Crystal Structure ◽  
Spectral Analysis ◽  
1H Nmr

Crystal structure of trans-[W(CO)4(η2-C2H4)2] and IR and 1H NMR studies of the reactions of this and related ethene carbonyl complexes of tungsten(0), [W(CO)n(η2-C2H4)6- n] ( n=3–5)

1999 ◽  
Vol 23 (4) ◽  
pp. 407-416 ◽  
Author(s):  
Teresa Szymańska-Buzar ◽  
Krystyna Kern ◽  
Anthony J. Downs ◽  
Timothy M. Greene ◽  
Leigh J. Morris ◽  
...  
Keyword(s):  
Crystal Structure ◽  
1H Nmr ◽  
Carbonyl Complexes ◽  
Nmr Studies

Facile Synthetic Protocols for the preparation of New Impurities in Pemetrexed Disodium Heptahydrate as an Anti-Cancer Drug

2021 ◽  
Vol 18 ◽  
Author(s):  
Rama Mohana Reddy Jaggavarapu ◽  
Venkatanarayana Muvvala ◽  
Ghojala Venkatareddy ◽  
Ravi Kumar Cheedarala
Keyword(s):  
Quality Control ◽  
Spectral Analysis ◽  
1H Nmr ◽  
Structure Elucidation ◽  
Research Work ◽  
Synthetic Methods ◽  
Cancer Drug ◽  
The Novel ◽  
Anti Cancer ◽  
Pemetrexed Disodium

: A facile synthetic protocols were employed to prepare process-related impurities associated with the synthesis of pemetrexed disodium heptahydrate, Alimta. The research work is described for the development of the novel synthetic methods and their structure elucidation of Pemetrexed glutamide, N-methyl pemetrexed, and N-methyl pemetrexed glutamide impurities. The listed impurities were deduced through spectral analysis such as 1H-NMR, 13CNMR, and HRMS. The target compounds can be used as the reference substances for the quality control.

Das 7,8-Benzo-5-chloro-1,4,4-trimethyl-1-aza-4-azonia-6,9-dioxa-5 λ5-phosphaspiro[4.4]nonanyl-Kation: Röntgenstrukturanalyse und temperaturabhängige 1H-NMR-Spektren: The 7, 8-Benzo-5-chloro-1,4,4-trimethyl-1-aza-4-azonia-6,9-dioxa-5 λ).5-phosphaspiro[4.4]nonanyl Cation: X-Ray Crystal Structure Determination and Variable 1H NMR Spectra

1992 ◽  
Vol 47 (6) ◽  
pp. 755-759 ◽  
Author(s):  
Thomas Kaukorat ◽  
Peter G. Jones ◽  
Reinhard Schmutzler
Keyword(s):  
Crystal Structure ◽  
1H Nmr ◽  
Nmr Spectra ◽  
Crystal Structure Analysis ◽  
Acceptor Interaction ◽  
Nmr Spectrum ◽  
X Ray ◽  
H Nmr ◽  
Trigonal Bipyramidal ◽  
Donor Acceptor

The 1H NMR spectrum of the spirophosphorane 3 at room temperature indicates dynamic behaviour of the cation. The low-temperature 1H NMR spectra of 3 exhibit two sets of doublets for the protons of the diastereotopic N(CH3)2 groups. The free enthalpy of activation for the dynamic process was determined (58.6 KJ/mole). In the reaction of 3 with sodium tetraphenylborate the crystalline compound, 4, involving the non-coordinating anion, [B(C6H5)4]-, was obtained. The X-ray crystal structure analysis of 4 reveals the presence of a five-membered ring, formally as a result of intramolecular donor-acceptor interaction between the nitrogen atom of the N(CH3)2 group and phosphorus. The geometry at phosphorus deviates somewhat from ideal trigonal bipyramidal.

1H NMR spectral analysis and conformational behavior of n-alkanes in different chemical environments

2012 ◽  
Vol 50 (9) ◽  
pp. 598-607 ◽  
Author(s):  
Tuulia Tynkkynen ◽  
Tommi Hassinen ◽  
Mika Tiainen ◽  
Pasi Soininen ◽  
Reino Laatikainen
Keyword(s):  
Spectral Analysis ◽  
1H Nmr ◽  
Conformational Behavior
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