| US 7,455,827 B2 | ||
| Process for preparing a catalyst for conversion of cyanopyridines to nicotinamides | ||
| Subhash Chandra Ray, Jharkhand (India); Baldev Singh, Jharkhand (India); Hiralal Prasad, Jharkand (India); Prodyot Kumar Sarkar, Jharkhand (India); Pashupati Dutta, Jharkhand (India); Shyam Kishore Roy, Jharkhand (India); Anup Kumar Bandyopadhyay, Jharkhand (India); and Raja Sen, Jharkhand (India) | ||
| Assigned to Council of Scientific and Industrial Research, New Delhi (India) | ||
| Filed on Jan. 24, 2006, as Appl. No. 11/337,542. | ||
| Application 11/337542 is a division of application No. 11/124142, filed on May 09, 2005, granted, now 7,345,176. | ||
| Application 11/124142 is a continuation of application No. 10/392388, filed on Mar. 20, 2003, abandoned. | ||
| Prior Publication US 2006/0155131 A1, Jul. 13, 2006 | ||
| Int. Cl. C01G 45/02 (2006.01); B01J 23/34 (2006.01); C07D 213/04 (2006.01); C07D 207/44 (2006.01); C07D 277/02 (2006.01) | ||
| U.S. Cl. 423—605 [502/324; 546/1] | 5 Claims |
| 1. A process for the preparation of a MnO2-based catalyst useful for the preparation of nicotinamide and isonicotinamide, the process comprising:
a) reacting a potassium permanganate and manganous salt solution in a neutral medium by adding an aqueous solution of a manganous
salt drop-wise to the potassium permanganate solution to obtain a reaction mixture;
b) continuously stirring the reaction mixture obtained in step (a);
(c) allowing the reaction mixture to stand;
(d) filtering a precipitate of MnO2 formed after step (c) and washing the precipitate with distilled water; and
e) drying the precipitate to obtain the catalyst.
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