scholarly journals SYNTHESIS OF ETHYL ESTERS OF PHENYL- AND p-PHENYL SUBSTITUTED CYCLOPROPANECARBOXYLIC ACIDS AND THEIR CONVERSION

2021 ◽  
pp. 11-17
Author(s):  
K.G. Guliyev ◽  
◽  
A.E. Rzayeva ◽  
A.M. Guliyev ◽  
◽  
...  
Keyword(s):  
Double Bond ◽  
Epoxy Resin ◽  
Ethyl Esters ◽  
Biologically Active ◽  
Trans Isomers ◽  
Cis And Trans Isomers ◽  
Composition And Structure ◽  
Thermocatalytic Decomposition ◽  
Cis And Trans ◽  
By Products

The reaction of carboethoxycarbene with styrene and p-substituted styrenes in the conditions of thermocatalytic decomposition of ethyl diazoacetate has been studied. It has been shown that the substituents in the investigated styrenes have an essential effect on the activity of the double bond with respect to carboethoxy¬¬carbene. It has been established as a result of the investigation that the substituents in the para- position of styrene influence essentially on the activity of the double bond with respect to carboethoxycarbene. It has been revealed that carboethoxycarbene is connected to the double bond of styrene and p-styrenes practically without formation of by products. As a result of the reaction, 2-phenyl and 2-p-substituted phenyl-1-ethoxycarbonyl cyclopropane (1–4) as a mixture of cis- and trans- isomers at a ratio of~ (30:70) with the predominant formation of a trans-isomer has been obtained. The composition and structure of the synthesized compounds have been established. It has been revealed that all synthesized cyclopropane-containing compounds show the various biologically active properties. In addition, the compounds 9–12 can be used as a modifier and diluent for epoxy resin ED-20

Replacement of the phosphodiester linkage in oligonucleotides by a C=C double bond: Comparison of the cis and trans isomers

1995 ◽  
Vol 36 (38) ◽  
pp. 6879-6882
Author(s):  
Sebastian Wendeborn ◽  
Romain M. Wolf ◽  
Alain De Mesmaeker
Keyword(s):  
Double Bond ◽  
Trans Isomers ◽  
Phosphodiester Linkage ◽  
Cis And Trans Isomers ◽  
Cis And Trans

Synthese von Silicium-Phosphor-Ringen - Struktur eines cis-2.2.4.4-Tetrakis(silylamino)-1.3-diphospha-2.4-disilacyclobutans / Synthesis of Silicon-Phosphorus-Rings - Structure of a cis-2,2,4,4-Tetrakis(silylamino)-1,3-diphospha-2,4-disilacyclobutane

1983 ◽  
Vol 38 (12) ◽  
pp. 1557-1562 ◽  
Author(s):  
Uwe Klingebiel ◽  
Norbert Vater ◽  
William Clegg ◽  
Martin Haase ◽  
George M. Sheldrick
Keyword(s):  
Crystal Structure ◽  
Nmr Spectra ◽  
Room Temperature ◽  
Molar Ratio ◽  
Trans Isomers ◽  
Cis And Trans Isomers ◽  
Cis And Trans ◽  
By Products ◽  
Cis Isomer

Fluorosilylphosphanes of the type R2SiFPHR′ (R = CHMe2, CMe3, NMeSiMe3; R′ = H, C6H5; 1-4) are obtained in the reaction of difluorosilanes with lithiated phosphanes in a molar ratio 1:1. Diphosphasilanes (5, 6) and a difluorosilylphosphane (7) are isolated as by-products. 1-4 react with n-C4H9Li to give cyclic silylphosphanes, LiF, and C4H10 (8-11). Dilithiated 5 reacts with F2PN(CMe3)SiMe3 to form of a four-membered SiP3-ring 12. The 31P NMR spectra of 9 and 11 show signal coalescence for the cis-and trans-isomers at room temperature. The crystal structure of the cis-isomer of 11 has been determined. The substituted ring 13 is prepared in the reaction of lithiated 9 and Me2SiF2

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.

scholarly journals The Metabolism of 14C-Labeled cis and trans Isomers of Octadecenoic and Octadecadienoic Acids

1964 ◽  
Vol 239 (8) ◽  
pp. 2482-2488
Author(s):  
Katsuto Ono ◽  
Donald S. Fredrickson
Keyword(s):  
Trans Isomers ◽  
Cis And Trans Isomers ◽  
Cis And Trans ◽  
Octadecadienoic Acids

Cis and trans isomers of 1-(5-bromothiophen-2-yl)-3-(10-chloroanthracen-9-yl)prop-2-en-1-one: Synthesis and characterization

2021 ◽  
Vol 1236 ◽  
pp. 130228
Author(s):  
P. Naresh ◽  
B. Pramodh ◽  
S. Naveen ◽  
S. Ganguly ◽  
J. Panda ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Trans Isomers ◽  
Cis And Trans Isomers ◽  
Cis And Trans

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

scholarly journals Separation of cis and trans Isomers of Polyproline by FAIMS Mass Spectrometry

2016 ◽  
Vol 27 (12) ◽  
pp. 2071-2074 ◽  
Author(s):  
Andrew J. Creese ◽  
Helen J. Cooper
Keyword(s):  
Mass Spectrometry ◽  
Trans Isomers ◽  
Cis And Trans Isomers ◽  
Cis And Trans
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