Accessible Requires Authentication Published by De Gruyter September 9, 2013

Combination of Best Promoter and Micellar Catalyst for Chromic Acid Oxidation of D-Mannitol to Mannose in Aqueous Media

Kombination des besten Promotors und mizellaren Katalysators für die Chromsäureoxidation von D-Mannitol zu Mannose im wässrigen Medium
Ankita Basu, Sumanta K. Ghosh, Rumpa Saha, Aniruddha Ghosh, Kakali Mukherjee and Bidyut Saha

Abstract

Chromic acid oxidation of D-mannitol to mannose has been studied in aqueous media. The effect of promoter (PA, phen and bpy), micellar catalyst (SDS, TX-100 and CPC) and their combination is studied. All the reactions were performed under the condition [D-mannitol]T ≫ [Cr(VI)]T. All the promoters accelerate the reaction rate and the rate is highest in presence of phen. In absence of a promoter the anionic surfactant SDS increases the rate followed by Triton TX-100. The cationic surfactant CPC retards the reaction in comparison to the reaction in aqueous media. Although phen is the best promoter in absence of any surfactant the catalyst combination of bpy and SDS produce a maximum rate enhancement.

Kurzfassung

Die Chromsäureoxidation von D-Mannitol zu Mannose im wässrigen Medium wurde untersucht. Der Einfluss des Promotors (PA, phen und bpy), des mizellaren Katalysators (SDS, TX-100 und CPC) sowie von Kombinationen daraus wurde studiert. Alle Reaktionen wurden unter der Bedingung, dass [D-mannitol]T ≫ [Cr(VI)]T ist, durchgeführt. Alle Promotoren beschleunigten die Reaktionsgeschwindigkeit, die in Gegenwart von phen am höchsten war. Bei Abwesenheit eines Promotor steigerte das anionische Tensid SDS die Geschwindigkeit, gefolgt von Triton TX-100. Das kationische Tensid CPC hemmte die Reaktion im Vergleich zur Reaktion im wässrigen Medium. Obwohl phen der beste Promotor bei Abwesenheit von Tensiden ist, lieferte die Katalysatorkombination aus bpy und SDS die maximale Geschwindigkeitssteigerung.


1 Dr. Bidyut Saha, Homogeneous Catalysis Laboratory, Department of Chemistry, The University of Burdwan, Golapbag, Burdwan, Pin 713104, WB, India, E-Mail:

Ankita Basu was born in Burdwan, in 1984. She passed her M.Sc degree from the University of Burdwan in 2007 and got NET-UGC fellowship on the year 2007. She is working in my lab in “Inorganic Reaction Mechanism” division.

Sumanta Kr. Ghosh was born in Burdwan, in 1974. He passed his M.Sc degree from the Visva-Bharati and got NET-CSIR fellowship on the year 1999. He is working in my lab in “Inorganic Reaction Mechanism and Catalysis” division.

Rumpa Saha was born in Burdwan, in 1987. She passed her M.Sc degree from the University of Burdwan in 2009 and got NET-CSIR fellowship on the year 2009. She is working in my lab in “Bio-remediation” division.

Aniruddha Ghosh was born in Raniganj, in 1988. He passed his M.Sc degree from the University of Burdwan in 2010 and got NET-UGC fellowship on the year 2010. He is working in my lab in “Bio-remediation” division.

Kakali Mukherjee was born in Bankura, in 1988. She passed her M.Sc degree from the University of Burdwan in 2011 and got NET-LS fellowship on the year 2010. She is working in my lab in “Bio-remediation” division.

Dr. Bidyut Saha was born in Birbhum, WB, India in 1975. He obtained his Ph.D degree from Visva Bharati University, India in 2007. He was a visiting scientist for the year 2009–2010 in the Department of Chemistry, UBC, Canada. Dr. Saha is presently working as an Assistant Professor in the Department of Chemistry, Burdwan University, India His area of interests is bioremediation of toxic metal, micellar catalysis and inorganic reaction mechanism. He has already published thirty four papers in international journals.


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Received: 2012-7-2
Revised: 2012-9-6
Published Online: 2013-09-09
Published in Print: 2013-07-15

© 2013, Carl Hanser Publisher, Munich