ChemInform Abstract: 3-Butyl-1-methylimidazolinium Borohydride ([bmim][BH4]) - A Novel Reducing Agent for the Selective Reduction of Carbon-Carbon Double Bonds in Activated Conjugated Alkenes.

ChemInform ◽  
2009 ◽  
Vol 40 (8) ◽  
Author(s):  
Jiayi Wang ◽  
Gonghua Song ◽  
Yanqing Peng ◽  
Yidong Zhu
Keyword(s):  
Selective Reduction ◽  
Reducing Agent ◽  
Double Bonds

The Efficient Wool Keratin Dissolution Based on New Reductant

2012 ◽  
Vol 441 ◽  
pp. 656-660 ◽  
Author(s):  
Jiang Bo Wang ◽  
Jian Yong Liu ◽  
Jie Wang ◽  
De Shan Bin
Keyword(s):  
Molecular Weight ◽  
Disulfide Bonds ◽  
High Selectivity ◽  
Selective Reduction ◽  
Reducing Agent ◽  
Dissolution Time ◽  
Sds Page ◽  
History Of ◽  
Wool Processing ◽  
Wool Keratin

The dissolution of the wool keratin has a history of several decades, but the effective dissolution method has not been found yet. In this article, a novel reducing agent TCEP (Tris (2-carboxyethyl) phosphine) was used, which has a strong ability for selective reduction of disulfide bonds. With a joint use of sodium bisulfite, the wool dissolution has a great advantage in wool processing compared with previous methods; Through amino acid analysis, it was found that the content of the cysteine decreased significantly when using the TCEP as reducing agent, and the other amino acids did not change significantly, indicating that TCEP has high selectivity for reduction of disulfide bonds, and plays a significant role to maintain the molecular weight of keratin. The efficiency of dissolution was greatly improved; dissolution time was 4h, dissolution rate was 93.6%, keratin concentration was 10%, the yield of keratin with the molecular weight more than 3500 and more than 8000 were 80% and 72% respectively. By using SDS-PAGE, we can get that the main molecular weight of the keratin was 14000-20000.

Homogeneous hydrogenation and deuteration of pentacyclic triterpenoids: Double bonds in side-chains

1981 ◽  
Vol 46 (11) ◽  
pp. 2734-2741 ◽  
Author(s):  
Jiří Protiva ◽  
Luděk Lepša ◽  
Eva Klinotová ◽  
Jiří Klinot ◽  
Václav Křeček ◽  
...  
Keyword(s):  
Selective Reduction ◽  
Side Chains ◽  
Double Bonds ◽  
Homogeneous Hydrogenation ◽  
Pentacyclic Triterpenoids ◽  
Rhodium Chloride

The reduction of terminal double bonds in the side chains on the rings A and E of pentacyclic triterpenoids by means of tris(triphenylphosphine)rhodium chloride permits selective reduction of dienes and labelling with deuterium with a low scattering. The effect of the amount of the catalyst and the solvent used on the rate of reduction was studied in the case of 3β,28-diacetylbetulin.

Metallurgical Behavior of Adjusted Converter Slag in Reduction Process

2011 ◽  
Vol 299-300 ◽  
pp. 310-313
Author(s):  
Min Chen ◽  
Zhen Tian ◽  
Qing Xian Yu ◽  
Zhen Feng Gao
Keyword(s):  
Mass Fraction ◽  
Slag Composition ◽  
Converter Slag ◽  
Reduction Rate ◽  
Selective Reduction ◽  
Reduction Process ◽  
Reducing Agent ◽  
Metal Phase ◽  
Reduction Temperature

The metallurgical behavior of adjusted converter slag components during the selective reduction process were investigated by thermodynamic calculating with different modified slag composition, addition of reducing agent and reduction temperature. The activities of main slag components were drawn from the calculated values. The results showed that the activity of SiO2increased with increment of its mass fraction in slag. The solubility of SiO2increased with increment of temperature. The selective reduction was promoted by selecting the appropriate amount of modifier. Reduction order was elucidated in this paper, Fe was reduced from the slag followed by P, Mn and Si and the reduction rate of Si could reach about 51%. The metal phase was rich in Fe, Si, Mn and P as a result of the selective reduction.

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