Reduction of Nitroarenes to Aromatic Amines with Sodium Borohydride in the Presence of Selenium and Actived Carbon

The reduction of aromatic nitro compounds to corresponding azoxy compounds with sodium borohydride was catalyzed by BiO(OH)/actived carbon (AC), which was prepared by equivalent-volume impregnation. The influences of catalyst, sodium borohydride and sodium hydroxide amount were investigated with 10 mmol of nitrobenzene as substrate in methanol at room temperature. The suitable reaction conditions are as follows: 0.2 g of catalyst, 10 mmol of sodium borohydride and 0.1 g of sodium hydroxide. Under the conditions, the seven aromatic nitro compounds were reduced to corresponding azoxy compounds with 27%-90% yields. Moreover, slight deactivation was observed after nine cycles of the catalyst.

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Reactions of sodium borohydride in acidic media. I. Reduction of indoles and alkylation of aromatic amines with carboxylic acids

Journal of the American Chemical Society ◽

10.1021/ja00832a035 ◽

1974 ◽

Vol 96 (25) ◽

pp. 7812-7814 ◽

Cited By ~ 179

Author(s):

Gordon W. Gribble ◽

Pierre D. Lord ◽

Jerauld Skotnicki ◽

Stephen E. Dietz ◽

Jefferson T. Eaton ◽

...

Keyword(s):

Carboxylic Acids ◽

Sodium Borohydride ◽

Aromatic Amines ◽

Acidic Media

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

TAPPI Journal ◽

10.32964/tj10.7.9 ◽

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.

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Interaction of the Excited Singlet State of Neutral Red with Aromatic Amines

Photochemistry and Photobiology ◽

10.1562/0031-8655(2000)071<0300:iotess>2.0.co;2 ◽

2000 ◽

Vol 71 (3) ◽

pp. 300 ◽

Cited By ~ 20

Author(s):

M. K. Singh ◽

H. Pal ◽

A. V. Sapre

Keyword(s):

Aromatic Amines ◽

Singlet State ◽

Neutral Red ◽

Excited Singlet State ◽

Excited Singlet

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

Communications in Physics ◽

10.15625/0868-3166/29/3/13763 ◽

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.

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