A study of reaction of aromatic polynitro compounds with tributylstannyl hydride

1985 ◽  
Vol 50 (11) ◽  
pp. 2598-2606 ◽  
Author(s):  
Vladimír Macháček ◽  
Antonín Lyčka ◽  
Milan Nádvorník
Keyword(s):  
Nmr Spectra ◽  
Reaction Products ◽  
Tetramethylammonium Bromide ◽  
Composition And Structure

1H, 13C, 15N, and 119Sn NMR spectra have been used to study composition and structure of reaction products from 1,3,5-trinitrobenzene, methyl 2,4,6-trinitrobenzoate, 1-dimethylamino-2,4,6-trinitrobenzene, 1-methoxy-2,4,6-trinitrobenzene, 1-chloro-2,4,6-trinitrobenzene, 2,4,6-trinitrotoluene, 3,5-dinitrobenzonitrile and methyl 3,5-dinitrobenzoate with tributylstannyl hydride in the presence of tetramethylammonium bromide.

scholarly journals Enzymatic hydrolysis of chicken viscera proteins in the presence of an ionic liquid as a strategy to improve the antioxidant properties of the hydrolysates

2019 ◽  
Author(s):  
Vitor Geniselli da Silva ◽  
Ruann Janser Soares de Castro
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Enzymatic Hydrolysis ◽  
Antioxidant Activities ◽  
Antioxidant Properties ◽  
Protein Hydrolysates ◽  
Tetramethylammonium Bromide ◽  
Chicken Viscera ◽  
Hydrolysis Of

Aiming to explore the use of ionic liquids (ILs) not yet described in the literature, this work evaluated the hydrolysis of proteins from chicken viscera using the protease Alcalase modified and unmodified by the IL tetramethylammonium bromide. The protein hydrolysates produced in the presence of the IL presented values of antioxidant activities 40% higher than the hydrolysates obtained without IL. In addition, with the presence of the IL, it was possible to obtain protein hydrolysates from chicken viscera with similar antioxidant activities, compared to the protein hydrolysates produced without IL, using 1/3 of the amount of enzyme.

Novel Thermally Stable Epoxy-polyurethane Composites: Preparation, Characterization

2011 ◽  
Vol 239-242 ◽  
pp. 2742-2747
Author(s):  
Jing Lin ◽  
Qiu Zhuan Yang ◽  
Xiu Fang Wen ◽  
Zhi Qi Cai ◽  
Pi Hui Pi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ring Opening ◽  
Thermal Characteristics ◽  
Ring Opening Reaction ◽  
Tetramethylammonium Bromide ◽  
One Step ◽  
Novolac Epoxy ◽  
Polyurethane Composites ◽  
Novolac Epoxy Resins ◽  
Thermal Stability Of

A novel series of hydroxyl terminated bisphenol-A type novolac epoxy resins modified with propionic acid (MEP) were prepared by one-step ring-opening reaction process in the presence of tetramethylammonium bromide catalyst. The obtained MEP was characterized using FTIR,1HNMR analyses. In addition, Intercross-linked epoxy-polyurethane composites networks were also obtained by curing reaction among MEP, cross linker polyisocyanate IL1351 and phthalic anhydride. The thermal characteristics of the epoxy-polyurethane composites were determined by thermogravimetric analysis (TGA). The thermal stability of the cured MEP with different ring-opening rate and cured alkyd polyol A450 were compared. The results showed that the obtained epoxy-polyurethane composites had much better thermal stability than the conventional polyurethane system A450/IL1351, and the thermal stability of them was correlated to the content of MEP.

Quantitative Determination of Chlorpromazine. HC1 in Tablets, Spansules, Injectables, and Bulk Chemical by Nuclear Magnetic Resonance Spectroscopy

1978 ◽  
Vol 61 (1) ◽  
pp. 52-54
Author(s):  
John E Zarembo ◽  
Richard J Warren ◽  
David B Staiger
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Internal Standard ◽  
Resonance Spectroscopy ◽  
Internal Standards ◽  
Tetramethylammonium Bromide ◽  
Bulk Chemical ◽  
Characteristic Signal ◽  
Nuclear Magnetic

Abstract A nuclear magnetic resonance (NMR) procedure is described for the quantitative analysis of chlorpromazine. HC1 in bulk chemical as well as in final dosage forms—tablets, spansules, and injectables. The method is based on measurement of a characteristic signal of chlorpromazine relative to an internal standard. Three different internal standards are specified: Cyclohexane was selected because of the convenience and rapidity with which samples could be prepared for assay. Piperonal was used to verify the method and to show that precision and accuracy were not affected by the volatility of the cyclohexane. Tetramethylammonium bromide was used as an internal standard for Thorazine injectable. No interferences were found from stearates and other tablet excipients. The NMR procedure provides a simple, direct, and specific assay with a precision of ± 1–2%.

Effect of pressures to 3 kbar on the electrical conductivity of tetramethyl-ammonium bromide and hydrobromic acid in propan-1-ol and propan-2-ol

1976 ◽  
Vol 29 (2) ◽  
pp. 249 ◽  
Author(s):  
JF Cukurins ◽  
W Strauss
Keyword(s):  
Electrical Conductivity ◽  
Hydrobromic Acid ◽  
Hydrogen Bromide ◽  
Ammonium Bromide ◽  
Proton Conductance ◽  
Tetramethyl Ammonium ◽  
Tetramethylammonium Bromide

The conductances of tetramethylammonium bromide and hydrogen bromide have been measured in propan-1- and -2-ol at 25�C to pressures of 3 kbar. The increase in pressure has an almost identical effect on the excess proton conductance in both solvents, approximately doubling this to 1.5 kbar, after which it remains approximately constant.

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