scholarly journals Stereochemical Studies. X. Effects of Neighboring Functional Groups on 1, 2-Asymmetric Induction in the Reduction of Propiophenone Derivatives with Sodium Borohydride

1972 ◽  
Vol 20 (3) ◽  
pp. 526-538 ◽  
Author(s):  
KENJI KOGA ◽  
SHUN-ICHI YAMADA
Keyword(s):  
Functional Groups ◽  
Sodium Borohydride ◽  
Asymmetric Induction

Metal-complex catalysis during the reduction of functional groups by sodium borohydride in the synthesis of pyrrolidine derivatives

2006 ◽  
Vol 42 (2) ◽  
pp. 180-183 ◽  
Author(s):  
A. O. Martirosyan ◽  
V. E. Hovhanesyan ◽  
S. P. Gasparyan ◽  
S. S. Mamayan ◽  
R. K. Ghazaryan ◽  
...  
Keyword(s):  
Metal Complex ◽  
Functional Groups ◽  
Sodium Borohydride ◽  
Metal Complex Catalysis

scholarly journals Some Uptake Studies of Metal Ions and the Formation of Cu₂0 Particles in Wool

2021 ◽  
Author(s):  
◽  
Ishira Samarasinghe
Keyword(s):  
Metal Ions ◽  
Functional Groups ◽  
Sodium Borohydride ◽  
Copper Ions ◽  
Cysteic Acid ◽  
Wool Fibre ◽  
In Situ Reaction ◽  
Merino Wool ◽  
Uptake Studies

<p>This research programme is concerned with the uptake studies of Cu2+, Zn2+ and Mn2+ at different conditions, by merino wool fibres and also uptake studies of Cu2+ ions by chemically modified wool fibres. Cu2O particles and Cu complexes are formed within merino wool by an in situ reaction with sodium borohydride and thioglycoloic acid respectively. The d-block elements have the ability to bind chemically to certain functional groups present within the keratin protein of wool. The absorption of the Cu2+, Mn2+ and Zn2+ from solution by wool fibres under different conditions notably, time, temperature and initial concentration have been studied. The optimum temperature and reaction time to give highest absorption of the Cu2+ by the wool fibre was found to be 90 oC and one hour without modifying the nature of the wool, from a solution of Cu2+ concentration of 450 mg L-1. Cu2+ was found to give the greatest absorption by the wool fibres, whereas Zn2+ and Mn2+ were found to be absorbed the least. The absorption of Cu2+ ions increases with increasing temperature. At the higher temperature of 90 oC, the -S-S- bonds in the cystine amino acids break more readily, generating thiol and cysteic acid groups to bind with copper ions. The uptake of Cu2+ by ethylenediaminetetraacetic dianhydride (14 mg g-1 of wool) or thioglycolic acid (42.5 mg g-1 of wool) or sodium borohydride (41.8 mg g-1 of wool) treated merino wool fibres increases with respect to unmodified wool (8 mg g-1 of wool). NaBH4 treated merino wool reduces Cu2+ ions to Cu2O particles which form within the wool fibres by an in situ reaction. TGA treated merino wool provides additional functional groups to bind with copper ions and Cu2O particles also likely to be formed within TGA treated wool composites. The metal ions were absorbed into the fibres under various conditions and the extent of absorption was quantified. The form and binding of the Cu2O particles or Cu2+ ions onto the wool fibres are studied using UV-Visible, FTIR, XRD, SEM, EDS and TEM methods.</p>

Reduction of 2-, 3- and 4-methylquinolines, 2-, 3- and 4-quinolylmethanols and corresponding quinolinecarboxaldehydes with triethylammonium formate

1981 ◽  
Vol 46 (6) ◽  
pp. 1518-1522 ◽  
Author(s):  
Miloslav Ferles ◽  
Oldřich Kocián
Keyword(s):  
Functional Groups ◽  
Sodium Borohydride

Reduction of the compounds mentioned in the title with triethylammonium formate gave 1-formyl-C-methyl-1,2,3,4-tetrahydroquinolines IIa-IIc. On reduction of derivatives substituted in the position 3 and 4 (Ib, Ic, Ie, If, Ih, Ii) the products of 1,2-addition are also formed i.e. IIIa, IIIb, and on reduction of 3-quinolylmethanol (Ie) and 3-quinolinecarboxaldehyde (Ih) the products of 1,4-addition, i.e. IVa, IVb also result. Alcohol If and aldehyde Ii also give the product of the reduction of the functional groups, i.e. 4-methylquinoline (Ic). When 3-quinolylmethanol (Ie) was prepared by reduction of aldehyde Ih with sodium borohydride 1,2,3,4-tetrahydro-3-quinolylmethanol (IIe) was also isolated.

Metal-Complex Catalysis During the Reduction of Functional Groups by Sodium Borohydride in the Synthesis of Pyrrolidine Derivatives.

ChemInform ◽  
2006 ◽  
Vol 37 (44) ◽  
Author(s):  
A. O. Martirosyan ◽  
V. E. Hovhanesyan ◽  
S. P. Gasparyan ◽  
S. S. Mamayan ◽  
R. K. Ghazaryan ◽  
...  
Keyword(s):  
Metal Complex ◽  
Functional Groups ◽  
Sodium Borohydride ◽  
Metal Complex Catalysis

Reduction of Some Functional Groups with Zirconium Tetrachloride/Sodium Borohydride

Synthesis ◽  
1988 ◽  
Vol 1988 (12) ◽  
pp. 995-996 ◽  
Author(s):  
Shinichi Itsuno ◽  
Yoshiki Sakurai ◽  
Koichi Ito
Keyword(s):  
Functional Groups ◽  
Sodium Borohydride ◽  
Zirconium Tetrachloride

Reduction of Some Functional Groups with Titanium(IV) Chloride/Sodium Borohydride

Synthesis ◽  
1980 ◽  
Vol 1980 (09) ◽  
pp. 695-697 ◽  
Author(s):  
Shinzo Kano ◽  
Yasuyuki Tanaka ◽  
Eiichi Sugino ◽  
Satsoshi Hibino
Keyword(s):  
Functional Groups ◽  
Sodium Borohydride
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