Highly Enantioselective and Regioselective Carbonyl Reduction of Cyclic α,β-Unsaturated Ketones Using TarB-NO2and Sodium Borohydride

2009 ◽  
Vol 11 (19) ◽  
pp. 4358-4361 ◽  
Author(s):  
Jinsoo Kim ◽  
John Bruning ◽  
Kevin E. Park ◽  
David J. Lee ◽  
Bakthan Singaram
Keyword(s):  
Sodium Borohydride ◽  
Unsaturated Ketones ◽  
Carbonyl Reduction

Activation of sodium borohydride via carbonyl reduction for the synthesis of amine- and phosphine-boranes

2021 ◽  
Author(s):  
P. Veeraghavan Ramachandran ◽  
Henry Hamann ◽  
Randy Lin
Keyword(s):  
Carbon Dioxide ◽  
Sodium Borohydride ◽  
Metathesis Reaction ◽  
Carbonyl Reduction ◽  
Amine Boranes

A highly versatile synthesis of amine-boranes via carbonyl reduction by sodium borohydride is described. Unlike the prior bicarbonate-mediated protocol, which proceeds via a salt metathesis reaction, the carbon dioxide-mediated synthesis...

scholarly journals Acylation of Enamines. III. Reduction of Protonated Enaminones with Sodium Borohydride. Synthesis of alpha,beta-Unsaturated Ketones.

1979 ◽  
Vol 33b ◽  
pp. 547-550 ◽  
Author(s):  
Lars Nilsson ◽  
Bengt Thulin ◽  
Olof Wennerström ◽  
Curt R. Enzell ◽  
Åke Åkeson ◽  
...  
Keyword(s):  
Sodium Borohydride ◽  
Unsaturated Ketones ◽  
Alpha Beta

1,4-Reductions of α,β-Unsaturated Ketones and Aldehydes via in situ Generated Hydridocuprates

Synlett ◽  
1989 ◽  
Vol 1989 (01) ◽  
pp. 64-66 ◽  
Author(s):  
Bruce H. Lipshutz ◽  
Christopher S. Ung ◽  
Saumitra Sengupta
Keyword(s):  
Unsaturated Ketones

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.

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