scholarly journals Studies on the Aqueous Solutions of Guanidinium Salts. XIII. NMR Study of the Interactions between Guanidinium Salt and Tetraalkylammonium Salts in Water

1980 ◽  
Vol 53 (8) ◽  
pp. 2212-2216 ◽  
Author(s):  
Koichiro Miyajima ◽  
Hiromitsu Yoshida ◽  
Yoshihiro Kuroda ◽  
Masayuki Nakagaki
Keyword(s):  
Aqueous Solutions ◽  
Tetraalkylammonium Salts ◽  
Nmr Study ◽  
Guanidinium Salt ◽  
Guanidinium Salts

Effects of salts on the kinetics of oxidation of alkenes by thallic salts in aqueous solutions

1981 ◽  
Vol 46 (3) ◽  
pp. 693-700 ◽  
Author(s):  
Milan Strašák ◽  
Jaroslav Majer
Keyword(s):  
Aqueous Solutions ◽  
Phase Transfer ◽  
Heterogeneous Reaction ◽  
Qualitative Model ◽  
Kinetic Effect ◽  
Tetraalkylammonium Salts ◽  
Reaction Conditions ◽  
Kinetics Of Oxidation ◽  
Kinetics Of ◽  
Heterogeneous Reaction Conditions

The kinetics of oxidation of alkenes by thallic sulphate in aqueous solutions, involving the two reaction steps-the hydroxythallation and the dethallation - was studied, and the effect of salts on the kinetics was examined; this made it possible to specify more precisely the reaction mechanism and to suggest a qualitative model of the reaction coordinate. It was found that in homogeneous as well as in heterogeneous reaction conditions, the reaction can be accelerated appreciably by adding tetraalkylammonium salts. These salts not only operate as catalysts of the phase transfer, but also exert a significant kinetic effect, which can be explained with a simplification in terms of a stabilization of the transition state of the reaction.

Orthoamide und Iminiumsalze, IC. Synthese und Reaktionen von N,N,N′,N′,N′′-Pentaalkyl-N′′-[2-(N,N,N′,N′,N′′-pentaalkylguanidinio)ethyl]-guanidiniumsalzen

2020 ◽  
Vol 75 (6-7) ◽  
pp. 685-695
Author(s):  
Willi Kantlehner ◽  
Ioannis Tiritiris ◽  
Wolfgang Frey ◽  
Ralf Kreß
Keyword(s):  
Crystal Structure ◽  
Guanidinium Salt ◽  
Guanidinium Salts

AbstractBis[bis(dibutylamino)methylen]hydrazine 8 is prepared from N,N,N′,N′-tetrabutylchloroformamidinium chloride (4c) and hydrazine. Bromine transforms 8 to the heterocyclic guanidinium salt 15a which is isolated as tetraphenylborate. From N,N,N′,N′-tetraalkylchloroformamidiniumchlorides and ethylendiamine the diguanidines are prepared which are alkylated to give diguanidinium salts, From these salts guanidinium salts can be prepared by anion metathesis with tetraphenylborate-, iodide-, hexafluorphosphate-, trifluoromethansulfonat-, bis(trifluormethansulfonyl)imide and tricyanmethanide as counteranions. The structure of the compounds 15 and 17b is confirmed by crystal structure analyses.

High resolution nuclear magnetic resonance studies of platinum(II) – guanosine-5′-monophosphate interactions in aqueous solutions

1981 ◽  
Vol 59 (23) ◽  
pp. 3297-3302 ◽  
Author(s):  
Moschos Polissiou ◽  
Minh Tan Phan Viet ◽  
Maurice St-Jacques ◽  
Theophile Theophanides
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Aqueous Solutions ◽  
Conformational Changes ◽  
Coupling Constant ◽  
Magnetic Resonance Studies ◽  
H Nmr ◽  
Nmr Study ◽  
Ribose Moiety

A detailed 400 MHz 1H nmr study was carried out on platinum complexation products of GMP by K2PtCl4. Coupling constant values show that platination on N7 induces a conformational change on the ribose moiety: the 3E form of the ring and the gt conformer about the C(4′)—C(5′) bond are favoured upon complexation. The results are compared to the conformational changes induced by N7 protonation and methylation.

scholarly journals 13C and 27Al NMR Study on the Interaction between Aluminium Ion and Iminodiacetic Acid in Acidic Aqueous Solutions.

1999 ◽  
Vol 15 (4) ◽  
pp. 393-395 ◽  
Author(s):  
Takushi YOKOYAMA ◽  
Hikaru ABE ◽  
Tsutomu KURISAKI ◽  
Hisanobu WAKITA
Keyword(s):  
Aqueous Solutions ◽  
Iminodiacetic Acid ◽  
27Al Nmr ◽  
Aluminium Ion ◽  
Nmr Study

Sorption of active dyes by polysaccharides from aqueous solutions tetraalkylammonium salts

2021 ◽  
Vol 22 (11) ◽  
pp. 508-512
Author(s):  
A.P Mikhailovskaya ◽  
◽  
I.V Elokhin ◽  
S.S Lysova ◽  
◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Tetraalkylammonium Salts
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