ChemInform Abstract: CIS- AND TRANS-ISOMERS OF (RH(EN)2X2)(+) WHERE X=CL AND BR, POSSIBLE USE OF (13)C NMR SPECTROSCOPY IN THEIR IDENTIFICATION

1975 ◽  
Vol 6 (40) ◽  
Author(s):  
C. BURGESS ◽  
F. R. HARTLEY
Keyword(s):  
Nmr Spectroscopy ◽  
Trans Isomers ◽  
Cis And Trans Isomers ◽  
Cis And Trans ◽  
C Nmr

Azido(imidazole)bis(acetylacetonato)cobalt(III) Complexes — Facile trans ⇋ cis Interconversion in Solution

1985 ◽  
Vol 40 (4) ◽  
pp. 470-476 ◽  
Author(s):  
J. K. Das ◽  
K. C. Dash
Keyword(s):  
Nmr Spectra ◽  
Equilibrium Mixture ◽  
Biologically Active ◽  
Trans Isomers ◽  
Active Ligand ◽  
Azide Ion ◽  
Cis And Trans Isomers ◽  
Neutral Base ◽  
Cis And Trans ◽  
C Nmr

A number of mixed-ligand complexes of cobalt(III) containing coordinated azide ion, acetyl- acetonatc anion and the neutral base imidazole and, having the general formula [Co(acac)2(N3)(Im)] (Im = imidazole or its derivatives) have been synthesised by the reaction of K[trans-Co(acac)2(N3)2] with the biologically active ligand imidazole or its derivatives. IR and electronic spectra alongwith 1H and 13C NMR spectra have been employed to characterise the complexes and determine their geometry. In contrast to the stable trans-[Co(acac)2(NO2)(Im)] complexes, these azido complexes arc shown to undergo facile trans ⇋ cis interconversion in CHCl3 solution. The NMR spectra (1H and 13C) can be interpreted by assuming the presence of an equilibrium mixture of the cis- and trans-isomers in solution.

A 1H and 13C nmr study of the radiation-induced degradation products of 2′-deoxythymidine derivatives: N-(2′-deoxy-β-D-erythropentofuranosyl) formamide

1981 ◽  
Vol 59 (24) ◽  
pp. 3313-3318 ◽  
Author(s):  
J. Cadet ◽  
R. Nardin ◽  
L. Voituriez ◽  
M. Remin ◽  
F. E. Hruska
Keyword(s):  
Molecular Conformation ◽  
Degradation Products ◽  
Trans Isomers ◽  
1H And 13C Nmr ◽  
Amide Linkage ◽  
Nmr Study ◽  
Cis And Trans Isomers ◽  
Radiation Induced ◽  
Cis And Trans ◽  
C Nmr

N-(2′-Deoxy-β-D-erythropentofuranosyl) formamide is an ionizing radiation-induced degradation product of 2′-deoxythymidine. This work describes a facile chemical synthesis of this molecule, and discusses the results of an 1H and 13C nmr study. The rotational barrier to cis–trans isomerization about the amide linkage is calculated, and details of the molecular conformation of the cis and trans isomers in aqueous solution are presented.

scholarly journals Identification of Anthocyanin Compounds in Butterfly Pea Flowers (Clitoria ternatea L.) by Ultra Performance Liquid Chromatography/Ultraviolet Coupled to Mass Spectrometry

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4539
Author(s):  
Nguyen Minh Thuy ◽  
Vo Minh ◽  
Tran Ben ◽  
My Tuyen Thi Nguyen ◽  
Ho Ha ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Ultra Performance Liquid Chromatography ◽  
Negative Ion ◽  
Trans Isomers ◽  
Clitoria Ternatea ◽  
Flower Extract ◽  
Cis And Trans Isomers ◽  
Butterfly Pea ◽  
Cis And Trans

Butterfly pea flower have great sensory attraction, but they have not yet been used widely in Vietnam. Extracts of butterfly pea flowers can be used conveniently as a natural blue colorant for food products. In this study, the identification of anthocyanin compounds in butterfly pea flowers was performed by UPLC coupled with a UV and Mass spectrometer instrument. Positive and negative ion electrospray MS/MS chromatograms and spectra of the anthocyanin compounds were determined. By analyzing the chromatograms and spectra for each ion, five anthocyanins were identified in the butterfly pea flower extract; these were delphinidin-3-(6”‐p-coumaroyl)-rutinoside, cyanidin 3-(6”-p-coumaroyl)-rutinoside, delphinidin-3-(p-coumaroyl) glucose in both cis- and trans- isomers, cyanidin-3-(p-coumaroyl-glucoside) and delphinidin-3-pyranoside. Additionally, based on their intensity, it was determined that cyanidin-3-(p-coumaroyl-glucoside) was the most abundant anthocyanin, followed by cyanidin 3-(6”-p-coumaroyl)-rutinoside, delphinidin-3-(p-coumaroyl-glucoside), delphinidin-3-(6”-p-coumaroyl)-rutinoside and delphinidin-3-pyranoside. In this study, cyanidin derivatives were discovered in butterfly pea flower extract, where these compounds had not been detected in previous studies.

Unveiling the coexistence of cis- and trans-isomers in the hydrolysis of ZrO2: A coupled DFT and high-resolution photoelectron spectroscopy study

2020 ◽  
Vol 153 (24) ◽  
pp. 244308
Author(s):  
Ali Abou Taka ◽  
Mark C. Babin ◽  
Xianghai Sheng ◽  
Jessalyn A. DeVine ◽  
Daniel M. Neumark ◽  
...  
Keyword(s):  
High Resolution ◽  
Photoelectron Spectroscopy ◽  
Spectroscopy Study ◽  
Trans Isomers ◽  
Cis And Trans Isomers ◽  
Cis And Trans ◽  
Hydrolysis Of
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