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5287containing all the other constituents. The reactions were run at 25 OC in a thermostated cell of a Beckman 24 spectrophotometer by following the decrease in the absorption at the A , of 1 ; (358 nm). All reactions were carried out with the substrate at more than 10 times the concentration of that of Isand the decrease in absorbance was recorded up to 8040% conversion. In all cases good pseudo-first-order behavior was observed.Equilibrium Constant Determinations. The equilibrium constants were determined by measuring the optical density of a solution containing the substrate at constant concentration [(0.6-1.0) X MI and CD in variable concentration in the range (0-15) X M. The wavelength for measurement was that where the difference spectrum shows a maximum. These values are shown in Table IV. All determinations were carried out in the thermostated cell of a Shimadzu spectrophotometer UV 260 with a solution of CD in water at the same concentration in the blank cell to substract any contribution to the observed absorption due to CD.

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