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Silver‐Sulphur Oxido‐Vanadium Cluster: A Newly Born Catalyst for Direct Reduction of Aryl Carboxylic Acids to Aldehydes via Mars and van Krevelen Mechanism
Author(s) -
Das Biraj,
Sharma Mukesh,
Satyanarayana Lanka.,
Karunakar Galla. V.,
Bania Kusum. K.
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600933
Subject(s) - catalysis , chemistry , aryl , sodium borohydride , organic chemistry , chemoselectivity , medicinal chemistry , alkyl
Now no more harsh condition and expensive catalyst or reducing agent would probably be required to directly convert aromatic acids to its corresponding aldehydes. Herein, we report for a cheap and recyclable solid catalyst consist of silver (Ag), sulphur (S) and vandium (V) having a structural unit of [ Ag 2 SCH 2 V 2 (O) 2 (COO) 2 ] n . This catalyst can directly reduce aromatic carboxylic acids to aldehydes with sodium borohydride (NaBH 4 ). High chemoselectivity and selectivity was achieved specially with ‐NO 2 substituted benzoic acids. Catalytic conversion was found to be excellent in THF and methanol except the pyridine carboxylates. At room temperature and under refluxing condition no catalytic conversion was observed. However, after subjecting to microwave (MW) irradiation followed by magnetic stirring under refluxing condition gave nitro‐benzaldehydes upto 90 % yield. Catalytic activity of the catalyst was found to retained upto 4 th consecutive cycles. The catalytic reaction was believed to proceed via Mars and van Krevelen mechanism.