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S. U. Sonavane, R. V. Jayaram
LETTER
(6) Hays, D. S.; Scholl, M.; Fu, G. C. J. Org. Chem. 1996, 61,
6751.
(7) Pauling, L. The Chemical Bond; Cornell University: USA,
1967.
(8) Bradshaw, C. W.; Fu, H.; Shen, G.-J.; Wong, C.-H. J. Org.
Chem. 1992, 57, 1526.
(9) Ohkuma, T.; Ikchira, H.; Ikariya, T.; Noyori, R. Synlett
1997, 467.
(10) Arase, A.; Hoshi, M.; Yamaki, T.; Nakauishi, H. J. Chem.
Soc., Chem. Commun. 1994, 855.
(11) Ohkuma, T.; Ooka, H.; Ikariya, T.; Noyori, R. J. Am. Chem.
Soc. 1995, 117, 10417.
(12) Johnstone, R. A. W.; Wilby, A. H.; Entwistle, I. D. Chem.
Rev. 1985, 85, 129.
(13) Brieger, G.; Nestrick, T. J. Chem. Rev. 1974, 74, 567.
(14) Zassinolich, G.; Mestroni, G. Chem. Rev. 1992, 92, 1051.
(15) Sonavane, S. U.; Jayaram, R. V. Synth. Commun. 2003, 33,
843.
was added an aq NH3 solution under vigorous stirring until
pH 10.0 was achieved. Then the co-precipitated hydroxides
were washed repeatedly to get neutral filtrate free of the
anions precursor materials. The precipitate was then dried in
an air oven for 24 h at 383 K and ground below 100 mesh.
The hydroxide was then calcined in a muffle furnace at 773
K for 8 h.
(24) Catalyst Characterisation: The catalyst was characterized
by X-ray diffraction using a Siemens D-500 X-ray
diffractometer with CuKa radiation and a Ni filter. FTIR
spectra were recorded with a JASCO FTIR spectrophoto-
meter by the KBr pellet method. The XRD of the synthesized
sample of the CoO-ZrO2 shows the formation of the cubic
phase. BET surface area by N2 adsorption-desorption
method and particle size of the catalyst were also
determined. The N2 adsorption-desorption isotherm of the
sample indicated that the sample was mesoporous having a
surface area 71 m2g–1. Optical microscopy photography
indicates the presence of uniform particle size, which is
found to be 45 mm.
(16) Sonavane, S. U.; Mohopatra, S. K.; Jayaram, R. V.; Selvam,
P. Chem. Lett. 2003, 32, 142.
(17) Mohopatra, S. K.; Sonavane, S. U.; Jayaram, R. V.; Selvam,
P. Tetrahedron Lett. 2002, 43, 8527.
(18) Mohopatra, S. K.; Sonavane, S. U.; Jayaram, R. V.; Selvam,
P. Org. Lett. 2002, 24, 4297.
(19) Mohopatra, S. K.; Sonavane, S. U.; Jayaram, R. V.; Selvam,
P. Appl. Cat., B: Environmental 2003, in press.
(20) Hubat, R.; Daage, M.; Bonnelle, J. P. Appl. Cat. 1986, 22,
231.
(21) Nitta, Y.; Ueno, K.; Imanaka, T. Appl. Cat. 1989, 56, 9.
(22) Kumbhar, P. S.; Coq, B.; Moreau, C.; Moreau, P.; Planiex,
J. M.; Warawadekar, M. G. Catalysis: Modern Trends 1995,
541.
(25) Typical Experimental Procedure: The liquid phase
reaction was carried out in a 100 mL two-necked round
bottom flask equipped with a reflux condenser and a
thermometer. In a typical catalytic hydrogen transfer
reaction, KOH pellets (20 mmol) were dissolved in propan-
2-ol (20 mL) to which the substrate (20 mmol) was added
along with 130 mg catalyst, which was then heated at reflux
at 356 K for a few hours depending upon the nature of the
substrate.
(26) For checking the reusability, after the first reaction, the
catalyst was recovered by simple filtration, and washed
several times with acetone followed by thorough washing
with water to remove alkali, and further dried at 373 K for 1
h and then the reaction was repeated for the subsequent
cycles.
(23) Catalyst Preparation: The catalyst was prepared by a co-
precipitation method. To an aq solution containing
ZrOCl2·8H2O and CoCl2·6H2O mixed in a 9:1 ratio (w/w)
Synlett 2004, No. 1, 146–148 © Thieme Stuttgart · New York