constant as long as the ratio of the concentrations of A to B remains constant. Therefore, over a range of alcohol concentrations where the ratio of the two alcohols is constant, the apparent extinction coefficient of the complexes should remain constant and the method used to calculate the AN for the pure alcohols should be applicable for the calculation of the Aapp for a mixture of alcohols.Oxidation of Organic Compounds with Cerium(IV). VIII.Oxidation of Bicyclo[2.2.1]-2-heptanols and Bicyclo [2.2.2] -2-octanol1

Determination and interpretation of the pKa values for a series of organic acids as a concrete example of the effect of structure on acid strength.

A microscale version of the iodine clock kinetics experiment with iodine and peroxydisulfate under temperature- controlled conditions that also permits calculating the activation energy.

can be eluted by pure hexane, and the ketone product, 2'acetonaphthone, is eluted with the slightly more polar solvent as detailed in the experimental section. ConcluslonWe feel that the Wacker oxidation experiment as described is cost-efficient due t o the small scale employed. This experiment should prove to be a valuable addkion to the undergraduate organic curriculum. It could be effectively used as an example of an oxidation process, a complex but readily understood catalytic process, as well as an effective preparative microscale chromatographic separation. Acknowledoment -We would like to thank Smith, Kline and Beehham Pharmaceuticals and the GTE FOCUS promam for their finan-.cial support of this project. Literature Clted I. Tsuji, J.; N~gashima, H.; Nemoto, H.

Students determine the pseudo-first-order rate constant for the elimination of HBr from 2-bromobutane and measure the yield and approximate composition of the alkene products, determine the yield of alkenes from 1-bromobutane under the same conditions, and examine the effect of changing solvent polarity on alkene yields for the two halides.