Titrations in non-aqueous media. Part V. Acid-base behaviour of substituted 2-amino-3-cyanofurans, 2-amino-3-cyanothiophenes and 2-amino-3-cyanopyrrole and their Schiff bases with salicylaldehyde and 2-hydroxy-1-naphthaldehyde

The Analyst ◽  
1986 ◽  
Vol 111 (12) ◽  
pp. 1439-1442 ◽  
Author(s):  
Turgut Gündüz ◽  
Esma Kılıç ◽  
Vedia Ertüzün ◽  
Gülay Çetinel
Keyword(s):  
Schiff Bases ◽  
Aqueous Media ◽  
Acid Base

Acid-base titrations of schiff bases in deuteriomethanol as studied by1H NMR

1989 ◽  
Vol 18 (7) ◽  
pp. 691-703 ◽  
Author(s):  
M. M�kel� ◽  
O. Hormi ◽  
E. Jula ◽  
T. Korpela
Keyword(s):  
Schiff Bases ◽  
Acid Base

scholarly journals Formation of highly quaternized N,N,N-trimethylchitosan: a chemoselective methodology in aqueous media

2019 ◽  
Vol 91 (3) ◽  
pp. 489-496 ◽  
Author(s):  
Youssouf D. Soubaneh ◽  
Steeven Ouellet ◽  
Caroline Dion ◽  
Jonathan Gagnon
Keyword(s):  
Biomedical Applications ◽  
Chemical Shifts ◽  
Aqueous Media ◽  
Acid Base ◽  
Specific Chemical ◽  
H Nmr ◽  
Low Degree ◽  
Simple Step ◽  
Carbonate Salt

Abstract N,N,N-Trimethylchitosan (TMC) represents a rare example of cationic polysaccharides and numerous studies have shown its potential in biological and biomedical applications. TMC with high degrees of quaternization (DQ) were synthesized from N-methylation of N,N-dimethylchitosan (DMC), which was obtained by reductive alkylation of high molecular weight chitosan in a simple step process and in good yields. The effects of base and solvents were evaluated on the quaternization reaction. The N-methylation of DMC was performed selectively by CH3I and carbonate in water where quaternization was achieved quantitatively with a low degree of O-methylation (17 %). Moreover, the greener procedure allows easy recovery and purification by conventional filtration as a carbonate salt, in which the anion can be exchanged by an acid-base reaction. Quantification of DQ involving 1H NMR integration of methyl peaks must be performed on protonated TMC. High field NMR spectra of TMC showed two specific chemical shifts for anomeric peaks (5.0 and 5.4 ppm) that can also be used for the determination of DQ. This latter method avoids the superimposition problems with other pyranosyl peaks.

ChemInform Abstract: Formation of Schiff Bases of 5′-Deoxypyridoxal and Hexylamine in Aqueous and Non-Aqueous Media.

ChemInform ◽  
2010 ◽  
Vol 22 (45) ◽  
pp. no-no
Author(s):  
M. A. VAZQUEZ ◽  
J. DONOSO ◽  
F. MUNOZ ◽  
F. GARCIA BLANCO ◽  
M. A. GARCIA DEL VADO ◽  
...  
Keyword(s):  
Schiff Bases ◽  
Aqueous Media

N-confused porphyrin possessing glucamine-appendants: Aggregation and acid/base properties in aqueous media

2008 ◽  
Vol 18 (24) ◽  
pp. 6394-6397 ◽  
Author(s):  
Yoshiya Ikawa ◽  
Hiroaki Ogawa ◽  
Hiroyuki Harada ◽  
Hiroyuki Furuta
Keyword(s):  
Aqueous Media ◽  
Acid Base ◽  
Base Properties

An interfacial voltaic cell for monitoring acid—base reactions in non-aqueous media

1980 ◽  
Vol 119 (2) ◽  
pp. 375-377 ◽  
Author(s):  
Bolesław Wàligóra ◽  
Maria Paluch
Keyword(s):  
Aqueous Media ◽  
Acid Base ◽  
Voltaic Cell

Formation of Schiff bases of 5′-deoxypyridoxal and hexylamine in aqueous and non-aqueous media

1991 ◽  
pp. 1143-1147 ◽  
Author(s):  
Miguel A. Vázquez ◽  
Josefa Donoso ◽  
Francisco Muñoz ◽  
Francisco García Blanco ◽  
M. Angeles García del Vado ◽  
...  
Keyword(s):  
Schiff Bases ◽  
Aqueous Media
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