Anhydride und Thioanhydride von tert-Butylstibinig-und -stibonigsäuren / Anhydrides and Thioanhydrides of tert-Butylstibinous-and Stibonous Acids

1981 ◽  
Vol 36 (9) ◽  
pp. 1105-1109 ◽  
Author(s):  
Hans Joachim Breunig ◽  
Helmut Kischkel
Keyword(s):  
Sodium Hydroxide ◽  
Sodium Sulfide ◽  
H Nmr

Abstract The reactions of di-tert-butylantimony chloride with sodium hydroxide or sodium sulfide yield new anhydrides or thioanhydrides of tert-butylstibinous acids, which have structures with bridging oxygen or sulfur atoms. Analogous reactions of tert-butylantimonydichloride produce the first examples of anhydrides or thioanhydrides of tertbutylstibonous acids, which have cyclic structures (t-BuSbE)n E = O, n = 3, 4; E = S, n = 2, 3, 4, 5. Structural evidence is based on IR, 1H NMR and MS data.

Improvement on Determination of the Components of Industrial Sodium Polysulfide

2013 ◽  
Vol 634-638 ◽  
pp. 87-90
Author(s):  
Zhao Long Huang ◽  
Shao Ping Feng ◽  
Du Shu Huang ◽  
Gui Yang Liu ◽  
Rui Min Xiao ◽  
...  
Keyword(s):  
Sodium Hydroxide ◽  
Analytical Method ◽  
Sodium Sulfide ◽  
Sodium Sulfite ◽  
Sodium Thiosulfate ◽  
Common Method ◽  
New Method ◽  
Sodium Polysulfide

The analytical method on sodium sulfide, sodium sulfite, sodium hydroxide and sodium thiosulfate in sodium polysulfide solution was studied in this paper. The questions in concealing sodium sulfite by formaldehyde and precipitating sodium sulfide by zine acetate, a common method reported in some papers before, was discussed. The improvement on concealing Na2SO3 by SrCl2 instead of formaldehyde and precipitating Na2S by Zn(OH)2 instead of Zn(Ac)2 and testing concentration of NaOH in the mixture, was studied. The results showed that new method is simpler, more rapid, more completely and accurate, the overwhelming reason being that it had no effect on stability of sodium polysulfide.

Synthesis and Application of Quaternary Ammonium-Functionalized Hyperbranched Polyester Antibacterial Agent

2013 ◽  
Vol 796 ◽  
pp. 412-415 ◽  
Author(s):  
Xiang Dong Zhou ◽  
Kun Chen ◽  
Jia Lei Guo ◽  
Yu Fang Zhang
Keyword(s):  
Escherichia Coli ◽  
Sodium Hydroxide ◽  
Quaternary Ammonium ◽  
Antibacterial Agent ◽  
Antibacterial Properties ◽  
Silk Fabric ◽  
Hyperbranched Polyester ◽  
Alkaline Catalyst ◽  
H Nmr

In the presence of alkaline catalyst sodium hydroxide, the intermediate of hyperbranched polyester (H20Cl) was prepared by the modification of hyperbranched polyester Boltorn H20 with epichlorohydrin. Then a new kind of quaternary ammonium functionalized hyperbranched polyester antibacterial agent (H20C16N) was synthesized by the reaction of H20Cl and hexadecyldimethylamine. The structures characterizations of H20C16N were characterized by 1H NMR. The application of H20C16N used as antibacterial agent of silk fabric was studied. The antibacterial ratio was 99.06% against escherichia coli and 98.24% against staphylococcus aureus.The excellent antibacterial properties of treated silk fabric were provided.

Partial methylation of methyl 4,6-dideoxy-α- and β-L-ribo-hexopyranosides

1984 ◽  
Vol 49 (9) ◽  
pp. 2130-2140 ◽  
Author(s):  
Karel Kefurt ◽  
Zdeňka Kefurtová ◽  
Jiří Jarý
Keyword(s):  
Gas Chromatography ◽  
Ir Spectra ◽  
Sodium Hydroxide ◽  
Methyl Iodide ◽  
Rate Constants ◽  
Hydroxyl Groups ◽  
View Point ◽  
Partial Methylation ◽  
H Nmr ◽  
Analogous Data

Anomeric methyl 4,6-dideoxy-L-ribo-hexopyranosides I and V, prepared from aldose IX, were etherified with methyl iodide in acetonitrile in the presence of sodium hydroxide. From the products of partial methylation methyl 4,6-dideoxy-2-O-methyl-α-L-ribo-hexopyranoside (II) and methyl 4,6-dideoxy-2,3-di-O-methyl-α-L-ribo-hexopyranoside (IV), or methyl 4,6-dideoxy-2-O-methyl-β-D-ribo-hexopyranoside (VI) and methyl 4,6-dideoxy-2,3-O-methyl-β-L-ribo-hexopyranoside (VIII), respectively, were isolated. The substances were identified by 1H NMR, mass and IR spectra and comparison with standards. The course of etherification of glycosides I and V was checked by gas chromatography and the reactivity of the hydroxyl groups was evaluated by determining the rate constants or their ratios. The observed values were compared with analogous data for other isomers of methyl 4,6-dideoxyhexopyranosides and discussed from the view-point of sterical and polar influence on the reactivity of both their hydroxylic groups.

Comparison of Antimicrobial Efficacy of Multiple Beef Hide Decontamination Strategies To Reduce Levels of Escherichia coli O157:H7 and Salmonella

2008 ◽  
Vol 71 (11) ◽  
pp. 2223-2227 ◽  
Author(s):  
BRANDON A. CARLSON ◽  
JOHN RUBY ◽  
GARY C. SMITH ◽  
JOHN N. SOFOS ◽  
GINA R. BELLINGER ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
High Pressure ◽  
Acetic Acid ◽  
Sodium Hydroxide ◽  
Organic Material ◽  
Sodium Sulfide ◽  
Sodium Metasilicate ◽  
Antimicrobial Efficacy ◽  
Escherichia Coli O157 ◽  
E Coli

This study involved a comparison of the antimicrobial efficacy of several beef hide decontamination interventions to identify those that more effectively reduced levels of Escherichia coli O157:H7 and Salmonella. Whole beef hides were inoculated with E. coli O157:H7 and Salmonella and decontaminated with sprays of solutions of acetic acid (AA; 10%, 55°C), lactic acid (LA; 10%, 55°C), sodium hydroxide (SH; 3%, 23°C), sodium metasilicate (SM; 4%, 23°C), or sodium hydroxide (1.5%), followed by high-pressure washing with chlorinated (0.02%) water (SHC; both applied at 23°C) or water (W; 23°C) or by deluging with solutions of potassium cyanate (PC; 2.4%, 30°C) or sodium sulfide (SS; 6.2%, 30°C). All spraying treatments (AA, LA, SH, SM, and SHC) resulted in removal of visual organic material, whereas the dehairing treatments (PC and SS) successfully removed hair along with visual organic material. The PC, SS, and SHC treatments resulted in the greatest reductions of E. coli O157:H7 (P < 0.05), by 5.1, 4.8, and 5.0 log CFU/cm2, respectively. The SS and SHC treatments decreased Salmonella by 4.2 and 4.4 log CFU/cm2, respectively, compared with the water treatment, which reduced levels by 1.7 log CFU/cm2 (P < 0.05). The SH, AA, and LA treatments also lowered both E. coli O157:H7 and Salmonella by at least 2.0 log CFU/cm2. The treatments that were effective in this study deserve further consideration for commercial implementation as hide decontamination interventions.

scholarly journals Silver Recovery from X-ray Film Waste by Leaching and Precipitation Method Using Sodium Hydroxide and Sodium Sulfide

2020 ◽  
Vol 6 (1) ◽  
pp. 62-69
Author(s):  
Soja Siti Fatimah ◽  
Wiwi Siswaningsih ◽  
Ali Kusrijadi ◽  
Fikri Aziz Shalahuddin
Keyword(s):  
Sodium Hydroxide ◽  
Sodium Sulfide ◽  
Precipitation Method ◽  
Optimum Conditions ◽  
Silver Recovery ◽  
X Ray

Silver recovery research from x-ray film waste by leaching and precipitation method using NaOH and Na2S aims to determine the optimum conditions in silver recovery. The parameters optimated in this study were the concentration of the precipitants, leaching temperature and the effect of the type of precipitants on the precipitated time. The results showed that the NaOH and Na2S precipitants were able to recover silver optimally at a concentration of 1.5 M. The optimum leaching temperature of the film with the Na2S precipitant to recover silver was at 25oC, whereas in the NaOH precipitant the film leaching temperature only affected the time of precipitation. Therefore, the formation of precipitate using Na2S is more efficient than NaOH, but the acquisition of silver is better to use NaOH than Na2S.

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