Silica supported urea-hydrogen peroxide as a source of oxygen

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Silica...Damandeep Kaur and B.R.Chabra.OHHHOH1750, 1655,910, 8806.07 and 5.37 (1Heach, d), 3.89 (1H,dd), 5.10 and 4.90(1H each, brs),3.27 and 2.74 (1Heach, d)46.5 (d), 29.8 (t),28.1 (t), 69.7 (s),53.0 (d), 85.1 (d),46.7 (d), 30.2 (t),36.5 (t), 148.2 (s),138.5 (s), 170.2 (s),119.3 (t), 108.5 (t),50.5 (t)O(8)HHHOHO3080, 1788,1640, 1120,8954.1 (1H, t), 3.1(2H, s), 4.9 and 5.0(1H each, brs),5.63 and 6.25 (1Heach, d)43.4 (d), 34.8 (t),210.4 (s), 148.3 (s),49.4 (d), 84.6 (d),43.4 (d), 29.8 (t),32.9 (t), 144.5 (s),59.8 (s), 178.4 (s),50.8 (t), 118.4 (s),112.4(s)O(9)OOH3480, 1615,1115, 10203.79 and 3.54 (2H,dd), 2.60 (1H, t),5.20 (1H, t), 1.40(1H, t), 1.95 (2H,m)61.2 (t), 64.9 (d),63.3 (s), 38.8 (t),24.3 (t), 124.7 (d),131.3 (s), 18.6 (q),24.6 (q), 17.5 (q)(11)OOH3430, 1140,10153.75 and 3.50 (2H,dd), 2.58 (1H, t),2.51 (1H, t), 1.24(3H, s), 1.36 (3H,s), 1.29 (3H, s)60.2 (t), 64.8 (d),63.2 (s), 36.4 (t),28.0 (t), 66.5 (d),61.7 (s), 24.4 (q),25.0 (q), 17.1 (q)O(12)O1680, 1660 6.32 (1H, t), 2.01(1H, m), 1.24 (3H,s), 2.39 and 2.54(1H each, d), 2.45(3H, s)198.5 (s), 135.1 (s),145.4 (d), 28.8 (t),41.6 (d), 40.2 (t),62.5 (s), 21.8 (q),52.4 (t), 16.9 (q)O(14)985 J. Chem. Bio. Phy. Sci. Sec. A, 2013, Vol.3, No.2, 980-987.
Silica...Damandeep Kaur and B.R.Chabra.OO1720, 1685,3075, 8902.75 (1H, t), 2.51(1H, m), 1.80 (3H,s), 4.90 and 5.10(1H each, d), 1.34(3H, s)205.4 (s), 62.5 (s),62.9 (d), 29.9 (t),35.8 (d), 42.5 (t),147.8 (s), 21.5 (q),110.9 (t), 15.5 (q)(15)RESULTS AND DISCUSSIONThe results obtained under the most favorable conditions using UHP- SiO 2 as the oxidising reagent arebetter than those obtained with aqueous H 2 O 2 under the same reaction conditions. The reagent is morestable and could be stored for several months without the loss of weight or its activity when compared toUHP as such. It does not need any special handling as is required in the case of peroxides. This reagentbeing inexpensive, non toxic and easily available is quite efficient for various organic transformations.Therefore, it is recommended for use in different purposes in organic chemistry which require hydrogenperoxide, as the easy recovery of the product using this reagent make these processes moreenvironmental friendly.List of abbreviations used:Silica supported urea-hydrogen peroxide UHP-SiO 2Hydrogen peroxide H 2 O 2Urea hydrogen peroxideUHPtetrahydrofuranTHFACKNOWLEDGEMENTThe authors thank the Punjab Government for financial support under the project ‘Chemistry andpotential of some natural products and synthetic heterocyclics as agrochemicals’.REFERENCES1. C. L. Hill, C. M. Prosser-McCartha, Coordination. Chem. Rev., 1995, 143, 407.2. I. V. Kozhevnikov, Chem. Rev., 1998, 98, 171.3. T. Okuhara, N. Mizuno, M. Misono, Adv. Catal., 1996, 41, 113.4. D. K. Lyon, W. K. Miller, T. Novet, P. J. Domaille, E. Evitt, D. C. Johnson, R. G. Finke, J. Am. Chem.Soc., 1991, 113, 7209.5. D. Mansuy, J. F. Bartoli, P. Battioni, D. K. Lyon, R. G. Finke, J. Am. Chem. Soc., 1991, 113, 7222.6. R. Manktala, R. S. Dhillon, B. R. Chhabra, Ind. J. Chem., 2006, 45B, 1591.7. N. K. Kala Raj, A. V. Ramaswamy, P. Manikandan, J. Mol. Catal. A : Chem., 2005, 227, 37.8. C. Lu, E. W. Hughes, P. A. Giguere, J. Am. Chem. Soc., 1941, 63, 1507.9. R. B. Milller, E. D. Behare, J Am Chem Soc, 1974, 96, 8102.986 J. Chem. Bio. Phy. Sci. Sec. A, 2013, Vol.3, No.2, 980-987.
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