Physical and electrochemical characterization of ionic liquids based on quaternary phosphonium cations containing a carbon–carbon double bond

2011 ◽  
Vol 56 (11) ◽  
pp. 4351-4355 ◽  
Author(s):  
Katsuhiko Tsunashima ◽  
Yasushi Ono ◽  
Masashi Sugiya
Keyword(s):  
Ionic Liquids ◽  
Double Bond ◽  
Electrochemical Characterization ◽  
Carbon Double Bond ◽  
Phosphonium Cations

The Characterization of Chitosan Nanoparticles by Raman Spectroscopy

2014 ◽  
Vol 665 ◽  
pp. 367-370 ◽  
Author(s):  
Xiao Dan Ren ◽  
Qing Shan Liu ◽  
Hui Feng ◽  
Xiao Ying Yin
Keyword(s):  
Raman Spectroscopy ◽  
Double Bond ◽  
Chitosan Nanoparticles ◽  
Carbon Double Bond

To study the performance of chitosan nanoparticles systematically, we characterized MMA, chitosan and synthesized chitosan nanoparticles by Raman spectroscopy. Through analyzing the characteristic peaks of each substance, we found MMA grafted chitosan by opening its carbon-carbon double bond. So Raman spectroscopy is a very effective way in terms of the characterization of nanomaterials .

Silyl-substituted α,β-Unsaturated Ketones from the Reaction of Silylvinylmetallic Reagents with Acid Anhydrides

1973 ◽  
Vol 51 (12) ◽  
pp. 2024-2032 ◽  
Author(s):  
A. G. Brook ◽  
J. M. Duff
Keyword(s):  
Double Bond ◽  
Low Temperatures ◽  
Silyl Group ◽  
Unsaturated Ketones ◽  
Carbon Double Bond ◽  
Benzoic Anhydride ◽  
Acid Anhydrides ◽  
By Products

The reactions of a series of silyl-substituted vinylmetallic reagents with acetic and benzoic anhydride have been investigated as a general route to α,β-unsaturated ketones having a silyl group attached to the carbon–carbon double bond. The reaction has been found to be generally applicable for acetyl derivatives provided low temperatures are used but the reaction with benzoic anhydride gives poorer results. The i.r. and u.v. spectra of the ketones are discussed. The characterization of novel 1,4-dienes obtained as by-products in the syntheses is also described.

Molecular cloning and characterization of Dbr1, a 2-alkenal reductase from Artemisia annuaThe nucleotide sequence reported in this article has been deposited in the GenBank database under accession No. FJ750460.This paper is one of a selection of papers published in a Special Issue from the National Research Council of Canada – Plant Biotechnology Institute.

Botany ◽  
2009 ◽  
Vol 87 (6) ◽  
pp. 643-649 ◽  
Author(s):  
Yansheng Zhang ◽  
Keat H. Teoh ◽  
Darwin W. Reed ◽  
Patrick S. Covello
Keyword(s):  
Double Bond ◽  
Artemisia Annua ◽  
Sequence Similarity ◽  
National Research Council ◽  
Plant Biotechnology ◽  
In Planta ◽  
Carbon Double Bond ◽  
Expressed Sequence ◽  
Selection Of

The molecular genetics of carbon–carbon double bond reduction in the plant Artemisia annua  L. was studied. Expressed sequence tags from this plant were investigated for sequences with similarity to known double-bond reductases. This resulted in the isolation of a cDNA, corresponding to the gene A. annua Dbr1 (Double bond reductase1), encoding a member of the medium chain dehydrogenase/reductase protein superfamily with sequence similarity to tobacco allyl alcohol dehydrogenase. Recombinant A. annua Dbr1 protein was purified from Escherischia coli and shown to catalyze the reduction of the carbon–carbon double bond of 2-alkenals. This activity included the reduction of the double bond at C11–C13 in the artemisinin precursor artemisinic aldehyde, albeit with unnatural stereochemistry. The substrate specificity, product stereochemistry, and expression pattern of A. annua Dbr1 point to its involvement in planta in the detoxification of 2-alkenals, which may be generated under oxidative stress conditions.

scholarly journals The synthesis and electrochemical characterization of bis(fluorosulfonyl)imide-based protic ionic liquids

2015 ◽  
Vol 51 (17) ◽  
pp. 3656-3659 ◽  
Author(s):  
S. Menne ◽  
T. Vogl ◽  
A. Balducci
Keyword(s):  
Ionic Liquids ◽  
High Performance ◽  
Electrochemical Characterization ◽  
Protic Ionic Liquids ◽  
Performance Gap ◽  
Significant Step

The use of PYRH4FSI represents a significant step towards the realization of high performance IL-based systems, which are able to fill the performance gap existing between these innovative electrolytes and the conventional ones.

Two phosphonium ionic liquids with high Li+ transport number

2015 ◽  
Vol 17 (35) ◽  
pp. 23041-23051 ◽  
Author(s):  
Vitor L. Martins ◽  
Nédher Sanchez-Ramirez ◽  
Mauro C. C. Ribeiro ◽  
Roberto M. Torresi
Keyword(s):  
Ionic Liquids ◽  
Transport Number ◽  
Physicochemical Characterization ◽  
Phosphonium Ionic Liquids ◽  
Phosphonium Cations

This work presents the physicochemical characterization of two ionic liquids (ILs) with small phosphonium cations, triethylpenthylphosphonium bis(trifluoromethanesulfonyl)imide ([P2225][Tf2N]) and (2-methoxyethyl)trimethylphosphonium bis(trifluoromethanesulfonyl)imide ([P222(201)][Tf2N]), and their mixtures with Li+.

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