scholarly journals Adamantanethione and its reduction to 2-adamantanethiol

1969 ◽  
Vol 47 (19) ◽  
pp. 3715-3716 ◽  
Author(s):  
J. W. Greidanus ◽  
W. J. Schwalm
Keyword(s):  
Sodium Borohydride ◽  
Phosphorus Pentasulfide ◽  
Indirect Route

Reaction of adamantanone with phosphorus pentasulfide affords the corresponding thioketone. This new, comparatively very stable alicyclic thione was also obtained by an indirect route from 2-ethoxy-2-adamantanethiol. Reduction of the thioketone with sodium borohydride yields 2-adamantanethiol.

THE PREPARATION OF 3-ALKYLTHIOINDOLES

1965 ◽  
Vol 43 (5) ◽  
pp. 1293-1297 ◽  
Author(s):  
R. V. Jardine ◽  
R. K. Brown
Keyword(s):  
Sodium Borohydride ◽  
Condensation Product ◽  
Ethyl Iodide ◽  
Reduction Product ◽  
Diethyl Acetal ◽  
Borohydride Reduction ◽  
Phosphorus Pentasulfide ◽  
Fischer Cyclization ◽  
Sodium Borohydride Reduction

3-Ethylthioindole has been prepared by Fischer cyclization of the condensation product of phenylhydrazine and ethylthioacetaldehyde diethyl acetal, and also by a route involving the reaction of ethyl iodide with the sodium borohydride reduction product of 1,2-dithiolo[4,3-b]indole-3-(4H)-thione. The last-named compound was obtained by reaction of 2-carbethoxy-indoxyl with phosphorus pentasulfide.

Phosphorus Pentasulfide Mediated Conversion of Primary Carbamates into Thiols

Synlett ◽  
2017 ◽  
Vol 28 (13) ◽  
pp. 1649-1651
Author(s):  
Pradeep Gupta ◽  
Chandra Maurya
Keyword(s):  
Total Synthesis ◽  
First Report ◽  
Phosphorus Pentasulfide ◽  
Indirect Route ◽  
Conversion Of Alcohols

In this paper, we report a method for the conversion of primary carbamates into thiols in the presence of phosphorus pentasulfide (P2S5) in refluxing toluene. Presently, no method exists in the literature for conversion of carbamates into thiols and, to the best of our knowledge, it is the first report for this type of conversion. This method presents an indirect route for the conversion of alcohols into thiols via their carbamate derivatives that may be useful in the total synthesis of compounds containing a thiol functionality.

Polysulfide-borohydride modification of southern pine alkaline pulping integrated with hydrothermal pre-extraction of hemicelluloses

TAPPI Journal ◽  
2011 ◽  
Vol 10 (7) ◽  
pp. 9-16
Author(s):  
SUNG-HOON YOON ◽  
HARRY CULLINAN ◽  
GOPAL A. KRISHNAGOPALAN
Keyword(s):  
Loblolly Pine ◽  
Sodium Borohydride ◽  
Kraft Pulping ◽  
Hot Water ◽  
Pulp Yield ◽  
Paper Strength ◽  
Southern Pine ◽  
Two Stage ◽  
Simultaneous Treatment ◽  
Process Modification

We studied three process modifications to investigate their effects on the property and yield recovery capabilities of kraft pulping integrated with hemicellulose pre-extraction of southern pine. Loblolly pine chips were pre-extracted with hot water until the sugar extraction yield reached the targeted value of 10% and then subjected to conventional and modified kraft pulping. Modification included polysulfide pretreatment; polysulfide-sodium borohydride dual pretreatment, and polysulfide followed by polysulfide-sodium borohydride dual pretreatment two-stage pretreatments prior to kraft pulping. In the first modification, about 5% of the lost pulp yield (total 7%) caused by hemicellulose pre-extraction could be recovered with 15%-20% polysulfide pretreatment. Complete recovery (7%) was achieved with simultaneous pretreatment using 15% polysulfide and 0.5% sodium borohydride with 0.1% anthraquinone in polysulfide-sodium borohydride dual pretreatment. Two-stage pretreatment using recycled 15% polysulfide followed by simultaneous treatment of 6% polysulfide and 0.4%–0.5% sodium borohydride with 0.1% anthraquinone also achieved 100% yield recovery. Continuous recycling of 15% polysulfide employed in the two-stage process modification maintained its yield protection efficiency in a repeated recycling cycle. No significant changes in paper strength were found in handsheets prepared from the three process modifications, except for a minor reduction in tear strength.

Synthesis and Characterization of Silver Nanoplates by a Seed-mediated Method

2019 ◽  
Vol 29 (3) ◽  
Author(s):  
Mai Ngọc Tuan Anh
Keyword(s):  
Hydrogen Peroxide ◽  
Silver Nanoparticles ◽  
Ascorbic Acid ◽  
Silver Nitrate ◽  
Sodium Borohydride ◽  
Trisodium Citrate ◽  
Synthesis And Characterization ◽  
Silver Nanoplates ◽  
Seed Mediated

Silver nanoplates (SNPs) having different size were synthesized by a seed-mediated method. The seeds -silver nanoparticles with 4 – 6 nm diameters were synthesized first by reducing silver nitrate with sodium borohydride in the present of Trisodium Citrate and Hydrogen peroxide. Then these seeds were developed by continue reducing Ag\(^+\) ions with various amount of L-Ascorbic acid to form SNPs. Our analysis showed that the concentratrion of L-Ascorbic acid, a secondary reducing agent, played an important role to form SNPs. In addition, the size and in-plane dipole plasmon resonance wavelenght of silver nanoplates were increased when the concentration of added silver nitrate increased. The characterization of SNPs were studied by UV-Vis, FE-SEM, EDS and TEM methods.

The synthesis of model lactones of cyclolignan type

1981 ◽  
Vol 46 (9) ◽  
pp. 2123-2128 ◽  
Author(s):  
Jiří Křepelka ◽  
Jiří Holubek
Keyword(s):  
Sodium Borohydride ◽  
Catalytic Hydrogenation ◽  
Dicarboxylic Acids ◽  
Inhibitory Effect ◽  
Experimental Animals

Lactones VI-IX were prepared on reduction of anhydrides of 4-aryl-1-methoxynaphthalene-2,3-dicarboxylic acids IV and V with sodium borohydride in methanol. Catalytic hydrogenation on platinum of lactones VIII and IX gave lactones with hydrogenated ring A, or A and C. Lactones XII and XIII were found to possess an inhibitory effect on the growth of the tumour S 37 in experimental animals.

scholarly journals Sodium borohydride (NaBH4) as a high-capacity material for next-generation sodium-ion capacitors

2021 ◽  
Vol 19 (1) ◽  
pp. 432-441
Author(s):  
Pawel Jeżowski ◽  
Olivier Crosnier ◽  
Thierry Brousse
Keyword(s):  
Energy Density ◽  
Sodium Borohydride ◽  
Metal Ion ◽  
High Capacity ◽  
Negative Electrode ◽  
Sodium Ion ◽  
Modern World ◽  
Next Generation ◽  
Good Efficiency ◽  
Voltage Range

Abstract Energy storage is an integral part of the modern world. One of the newest and most interesting concepts is the internal hybridization achieved in metal-ion capacitors. In this study, for the first time we used sodium borohydride (NaBH4) as a sacrificial material for the preparation of next-generation sodium-ion capacitors (NICs). NaBH4 is a material with large irreversible capacity of ca. 700 mA h g−1 at very low extraction potential close to 2.4 vs Na+/Na0. An assembled NIC cell with the composite-positive electrode (activated carbon/NaBH4) and hard carbon as the negative one operates in the voltage range from 2.2 to 3.8 V for 5,000 cycles and retains 92% of its initial capacitance. The presented NIC has good efficiency >98% and energy density of ca. 18 W h kg−1 at power 2 kW kg−1 which is more than the energy (7 W h kg−1 at 2 kW kg−1) of an electrical double-layer capacitor (EDLC) operating at voltage 2.7 V with the equivalent components as in NIC. Tin phosphide (Sn4P3) as a negative electrode allowed the reaching of higher values of the specific energy density 33 W h kg−1 (ca. four times higher than EDLC) at the power density of 2 kW kg−1, with only 1% of capacity loss upon 5,000 cycles and efficiency >99%.

scholarly journals Reduction of the beta-Cys-gamma-Glu thiol ester bond of human C3 with sodium borohydride.

1983 ◽  
Vol 258 (22) ◽  
pp. 13580-13586 ◽  
Author(s):  
M L Thomas ◽  
F F Davidson ◽  
B F Tack
Keyword(s):  
Sodium Borohydride ◽  
Ester Bond ◽  
Thiol Ester
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