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Asish De (1982) J Sci Ind Res 41:484 81. Curci R, Lopez L, Troisi L (1988) Tetrahedron Lett 29(25):3145 82. Hanson JR, Trunesh A (1988) J Chem Soc Perkin Trans 1:2001 83. Linz T, Schaefer HJ (1987) Tetrahedron Lett 28(52):6581 84. Corey EJ, Fleet GWJ (1973) Tetrahedron Lett 4499 85. Parish EJ, Chitrakorn S (1985) Synth Commun 15:393 86. Aizpurua JM, Claudio P (1983) Tetrahedron Lett 24:4367 87. Inaki G, Aizpurua JM, Claudio P (1984) J Chem Res Synop 92 88. Jidong L, Yuanyau W (1987) Synth Commun 17:1717 89.

3 Enhancement of Reagent Potency The relatively more recent Cr(VI) reagents discussed earlier have been claimed to be mild in potency and convenient to handle; but, at least, some would require a prolonged period for achieving complete conversions. No Substrate Product(s) PDC/I2 PDC/I2 PDC/I2 PDC/I2 Reagent CH2Cl2 CH2Cl2 CH2Cl2 CH2Cl2 Solvent (continued) [53] [53] [53] [53] Ref. No Substrate R R OH (CH2)3OH But OH I R Poor reactiona Poor reactiona HO O R = C6H5- R Product(s) O But R OH O 93 88 10 % Yield PCC-Pyrazole PCC-Pyrazole PCC-Pyrazol;e PCC-Pyrazole PDC/I2 Reagent CH2Cl2 CH2Cl2 CH2Cl2 CH2Cl2 CH2Cl2 Solvent (continued) [67, 68] [67, 68] [67, 68] [67, 68] [53] Ref.

3 Mechanistic Implications Mechanistic investigations on the oxidation of a variety of substrates including carbohydrates [46, 47], carboxylic acids [20, 22, 48, 49], arylalkyl sulphides [33, 50], hydrocarbons [28, 34], ethers [51, 52], phenols [53], sulphoxides [54, 55], oxamic acid [56], mercaptans [4], acetals [57, 58], a-hydroxyacids [6, 57–61] and esters [62] by different Cr(VI) oxidants are abundant in literature. 2 2–6 Data taken from Ref. 1). 1 The rate determining step involving a C–H cleavage has been demonstrated with experiments on kinetic isotope effects.

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5 Minute Daily Practice - Test Taking - Grades 4 - 8 by Jacqueline B. Glasthal


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