Dipolar Dyes with a Pyrrolo[2,3-b]quinoxaline Skeleton Containing a Cyano Group and a Bridged Tertiary Amino Group: Synthesis, Solvatofluorochromism, and Bioimaging

2016 ◽  
Vol 11 (11) ◽  
pp. 1718-1724 ◽  
Author(s):  
Łukasz G. Łukasiewicz ◽  
Irena Deperasińska ◽  
Yevgen M. Poronik ◽  
Yong Woong Jun ◽  
Marzena Banasiewicz ◽  
...  
Keyword(s):  
Cyano Group ◽  
Amino Group ◽  
Tertiary Amino

ChemInform Abstract: Dipolar Dyes with a Pyrrolo[2,3-b]quinoxaline Skeleton Containing a Cyano Group and a Bridged Tertiary Amino Group: Synthesis, Solvatofluorochromism, and Bioimaging.

ChemInform ◽  
2016 ◽  
Vol 47 (42) ◽  
Author(s):  
Lukasz G. Lukasiewicz ◽  
Irena Deperasinska ◽  
Yevgen M. Poronik ◽  
Yong Woong Jun ◽  
Marzena Banasiewicz ◽  
...  
Keyword(s):  
Cyano Group ◽  
Amino Group ◽  
Tertiary Amino

scholarly journals Adsorption of Phenol from Aqueous Solution by Aminated Hypercrosslinked Polymers

2005 ◽  
Vol 23 (4) ◽  
pp. 335-346 ◽  
Author(s):  
Yue Sun ◽  
Jin-Long Chen ◽  
Ai-Min Li ◽  
Fu-Qiang Liu ◽  
Quan-Xing Zhang
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Kinetic Studies ◽  
Amino Group ◽  
Commercial Resin ◽  
The Matrix ◽  
Basic Anion Exchange Resin ◽  
Tertiary Amino ◽  
Basic Anion ◽  
Hypercrosslinked Polymeric Adsorbent

The adsorption of phenol from aqueous solution onto the hypercrosslinked polymeric adsorbent NDA-100 and its dimethylamine aminated derivatives AH-1, AH-2 and AH-3, the commercial resin Amberlite XAD-4 and the weakly basic anion-exchange resin D301 was compared. Of the tested polymers, the aminated hypercrosslinked resins had the highest adsorption capacities. The empirical Freundlich equation was successfully employed to describe the adsorption process. The specific surface area and the micropore structure of the adsorbent together with the tertiary amino group on the matrix affected the adsorption performance towards phenol. Furthermore, these factors also influenced the thermodynamic properties. Kinetic studies demonstrated that the presence of the tertiary amino group on the polymer matrix decreased the adsorption rate and increased the apparent activation energy of the adsorption process.

N,N-Dimethyl Tertiary Amino Group Mediated Dual Pancreas- and Lung-Targeting Therapy against Acute Pancreatitis

2017 ◽  
Vol 14 (5) ◽  
pp. 1771-1781 ◽  
Author(s):  
Shi Luo ◽  
Peiwen Li ◽  
Sha Li ◽  
Zhengwu Du ◽  
Xun Hu ◽  
...  
Keyword(s):  
Acute Pancreatitis ◽  
Amino Group ◽  
Targeting Therapy ◽  
Lung Targeting ◽  
Tertiary Amino

Anomalous phase behavior in blends of -SO3H terminated polystyrene with poly(n-butyl acrylate) containing a small amount of tertiary amino groups

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Kenji Yamamoto ◽  
Ayumi Nanakno ◽  
Hiroyasu Masunaga ◽  
Isamu Akiba
Keyword(s):  
Butyl Acrylate ◽  
Stoichiometric Composition ◽  
Phase Region ◽  
Molar Ratio ◽  
Amino Group ◽  
Amino Groups ◽  
Two Phase ◽  
Dimethylaminoethyl Methacrylate ◽  
X Ray Scattering ◽  
Tertiary Amino

Abstract Phase behavior in the blend of -SO3H terminated polystyrene (PSS) with poly(n-butyl acrylate-co-N,N-dimethylaminoethyl methacrylate) containing 6.0 mol% N,N-dimethylaminoethyl methacrylate (P1) is investigated by optical microscopy and small-angle X-ray scattering (SAXS). Comparing the miscibility of polystyrene/P1 blend, it is confirmed that the miscibility of the PSS/P1 blend is drastically improved by the hydrogen bonds between -SO3H and tertiary amino group. In addition, two-phase region of the PSS/P1 blend is split into two regions around the stoichiometric composition, in which the molar ratio of -SO3H to tertiary amino group is 1:1 stoichiometry. SAXS result shows that the PSS/P1 blend at stoichiometric composition forms a block copolymer-like aggregate and it takes a disorder state.

scholarly journals Heterocycle-based bifunctional organocatalysts in asymmetric synthesis

2016 ◽  
Vol 88 (6) ◽  
pp. 561-578 ◽  
Author(s):  
Carmen Nájera ◽  
José Miguel Sansano ◽  
Enrique Gómez-Bengoa
Keyword(s):  
Michael Reaction ◽  
Amino Group ◽  
Benzylic Alcohols ◽  
Carbon Nucleophiles ◽  
Direct Aldol Reaction ◽  
Solvent Free Conditions ◽  
Different Types ◽  
Primary Amino ◽  
Tertiary Amino ◽  
The Michael Reaction

AbstractDifferent chiral bifunctional organocatalysts derived from trans-cyclohexane-1,2-diamine bearing different types of guanidine units able to form-hydrogen bonding activation have been designed. Conformational rigid 2-aminobenzimidazoles bearing a tertiary amino group have been used in enantioselective Michael type reactions of activated methylene compounds to nitroalkenes. The C2 symmetric bis(2-aminobenzimidazole) derivatives the appropriate organocatalyst for the conjugate addition of 1,3-dicarbonyl compounds to maleimides as well as for the SN1 reaction of benzylic alcohols with carbon nucleophiles. 2-Aminobenzimidazoles bearing a primary amino group have shown excellent catalytic activity in the Michael reaction of aldehydes to maleimides and nitroalkenes. Diastereomeric 2-aminopyrimidines bearing a prolinamide unit have been incorporated in the trans-cyclohexane-1,2-diamine scaffold and have been used for the inter- and intra-molecular direct aldol reaction under solvent-free conditions. For the Michael reaction of aldehydes with maleimides the primary amine 2-aminopyrimidine has shown excellent efficiency as organocatalyst. The bifunctional character of these organocatalysts has been demonstrated by means of DFT calculations.

scholarly journals Factorial design-assisted spectroscopic determination of oxybutynin hydrochloride

2021 ◽  
Vol 8 (11) ◽  
Author(s):  
Eman Yosrey ◽  
Heba Elmansi ◽  
Zeinab A. Sheribah ◽  
Mohamed El-Sayed Metwally
Keyword(s):  
Ion Pair ◽  
Critical Parameters ◽  
Spectroscopic Methods ◽  
Amino Group ◽  
Quenching Mechanism ◽  
Spectrophotometric Measurement ◽  
Volmer Plot ◽  
Tertiary Amino ◽  
Oxybutynin Hydrochloride

In this study, we have developed two facile spectroscopic methods for quantifying oxybutynin (OBT) hydrochloride in its pure form and tablets using design of experiments (DOEs). The spectroscopic methods depended on the ion-pair complex formation between the tertiary amino group in the drug and eosin in 0.2 M acetate buffer of pH 4. Method I involves spectrophotometric measurement of the absorbance of the developed complex at 550 nm and showed linearity through 1.0–10.0 µg ml −1 . Method II involves spectrofluorometric measurement of the quenching influence of OBT on the native fluorescence of eosin (λ excitation/λ emission of 304/548 nm) and showed linearity through 1.0–6.0 µg ml −1 . Critical parameters were identified through preliminary trials and optimized using the DOE. Additionally, the quenching mechanism was investigated and the pathway of the reaction was postulated. The fluorescence quenching constant and thermodynamic parameters were explored using the Stern–Volmer plot and Van't Hoff graph, respectively. Assessments conducted via analytical ecoscale revealed the ‘excellent-greenness’ of the methodology. The two methods have the potentials of being green and fast compared with other reported methods.

Colorimetric Assay of Reserpine in Formulations and Biological Fluids

1976 ◽  
Vol 59 (4) ◽  
pp. 795-798 ◽  
Author(s):  
Mohamed S Karawya ◽  
Abdel-Aziz A Sharaf ◽  
Aly M Diab
Keyword(s):  
Citric Acid ◽  
Acetic Anhydride ◽  
Colorimetric Assay ◽  
Biological Fluids ◽  
Ester Group ◽  
Amino Group ◽  
Tertiary Amino ◽  
And Control ◽  
Colorimetric Methods

Abstract Two colorimetric methods are presented for determining reserpine. In the first method, an iron hydroxamate complex is formed through the ester group in position 16 in the reserpine molecule. The color is measured at 535 nm (0.5–6 mg/25 ml). This method is useful for routine and control analyses of reserpine formulations. In the second method the tertiary amino group of reserpine reacts with 2% citric acid in acetic anhydride to form a red-violet complex which is measured at 505 nm (5–400 μg/10 ml). This method could be useful in measuring trace amounts of reserpine present in biological fluids.

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