scholarly journals Selective Reduction of Carbohydrate Nitroolefins

1972 ◽  
Vol 50 (8) ◽  
pp. 1292-1295 ◽  
Author(s):  
Hans H. Baer ◽  
Werner Rank
Keyword(s):  
Acetic Acid ◽  
Nitro Group ◽  
Sodium Borohydride ◽  
Selective Reduction ◽  
Group 5 ◽  
Sugar Derivatives

Reduction of the four stereoisomeric methyl 4,6-O-benzylidene-2,3-dideoxy-3-nitro-hex-2-enopyranosides (1–4) with sodium borohydride gave in 80–90% yield the corresponding saturated nitro glycosides that possess an equatorial nitro group (5–8). Reduction of 1–4 with zinc and acetic acid gave in similar yields the corresponding 2,3-dideoxy-3-oximino glycosides (9–12). Two of the latter were deoximated to 2,3-dideoxy-3-oxo sugar derivatives.

Selective reduction of acetic acid to ethanol over novel Cu2In/Al2O3 catalyst

2013 ◽  
Vol 464-465 ◽  
pp. 313-321 ◽  
Author(s):  
György Onyestyák ◽  
Szabolcs Harnos ◽  
Szilvia Klébert ◽  
Magdalena Štolcová ◽  
Alexander Kaszonyi ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Selective Reduction ◽  
Al2o3 Catalyst

DITHIOL-FERROUS CHLORIDE CATALYZED SELECTIVE REDUCTION OF ALKYNES WITH SODIUM BOROHYDRIDE

1985 ◽  
Vol 14 (12) ◽  
pp. 1851-1854 ◽  
Author(s):  
Masashi Kijima ◽  
Yoko Nambu ◽  
Takeshi Endo
Keyword(s):  
Sodium Borohydride ◽  
Selective Reduction ◽  
Ferrous Chloride

Bromination of 5a-lanost-8-en-3-one and 5a-lanost-8-ene-3,7,ll-trione

1982 ◽  
Vol 35 (4) ◽  
pp. 857
Author(s):  
J Collins ◽  
PS Cooper ◽  
RE Gall ◽  
A Georges
Keyword(s):  
Acetic Acid ◽  
Sodium Borohydride ◽  
Major Product ◽  
Equilibrium Conditions

Monobromination of 5α-lanost-8-en-3-one (la) under kinetic conditions gave exclusively the 2β- bromo ketone (3a) whilst under equilibrium conditions the product contained 85% of the 2α-bromo ketone (2a). Monobromination of 5a-lanost-8-ene-3,7,11-trione (1b) under kinetic conditions gave the 2a-bromo ketone (2b); 33% of the 2β-bromo ketone (3b) was formed under equilibrium conditions. The configuration assigned to the bromo ketones (2b) and (3b) has been confirmed by reduction with sodium borohydride and treatment of the derived bromohydrins (4b) and (6b) with base to give the 2β,3β-epoxide (5b) and the 3-ketone (1b) respectively. Cleavage of the 2β,3β(-epoxide (5a) with acetic acid gave 2α-acetoxy-5α-lanost-8-en-3β-ol (7) as the major product and 3α-acetoxy-5α-lanost- 8-en-2β-ol (a), in a boat like conformation, as the minor product.

scholarly journals Eine neue Methode zur Herstellung und Reinigung von 5-Methyltetrahydrofolsäure / A New Method for Preparation and Purification of 5-M ethyltetrahydrofolic Acid

1973 ◽  
Vol 28 (11-12) ◽  
pp. 650-652
Author(s):  
Harold Rüdiger ◽  
Reinhard Siede
Keyword(s):  
Acetic Acid ◽  
Folic Acid ◽  
Ion Exchange ◽  
Sodium Borohydride ◽  
Sodium Salt ◽  
Barium Salt ◽  
Borohydride Reduction ◽  
Methyl Derivative ◽  
Crude Product ◽  
Sodium Borohydride Reduction

Abstract 5-Methyltetrahydrofolic acid is prepared from folic acid by sodium borohydride reduction, reac­ tion with formaldehyde and reduction to the methyl derivative by sodium borohydride. The crude product is precipitated as barium salt which after having been converted to the sodium salt by ion exchange is adsorbed to QAE-Sephadex and eluted by different acetic acid gradients in subsequent chromatographies. This method allows to process gram quantities on reasonably small columns

Reduction of 3‐Acyl Derivatives of Oxindoles, Benzo[b]furan‐2‐ones, and Benzo[b]thiophen‐2‐ones to the Corresponding Alkyl Derivatives by Sodium Borohydride–Acetic Acid

2006 ◽  
Vol 36 (6) ◽  
pp. 765-769 ◽  
Author(s):  
Francis X. Smith ◽  
Brian D. Williams ◽  
Eric Gelsleichter ◽  
Judy A. Podcasy ◽  
John T. Sisko ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Sodium Borohydride ◽  
Alkyl Derivatives ◽  
Derivatives Of ◽  
Acyl Derivatives
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