By United States. High Energy Physics Advisory Panel. Subpanel on Vision for the Future of High-Energy Physics

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1967a,b). The pioneering studies of Bender’s group were followed by many attempts to increase the efficiency of esterolysis by cyclodextrins and several approaches have been tried, most notably in Breslow’s laboratory. , 1980), or alter the solvent (Siegel and Breslow, 1975). The last of these is the easiest to achieve but detailed studies are made tedious by the necessity to redetermine all of the relevant equilibrium and rate constants, and the acidity dependence of the catalysed and uncatalysed processes, in the new medium.

More recently, Bonora et al. 8). For both CDs the values of Ks diminish significantly with the length of the alkanoate chain, implying that there has been a switch from binding of the aryl group to binding of the alkyl chain. Studies of the variation of the circular dichroism of the ester chromophore induced by CD binding support this conclusion. Moreover, the variation of the kinetic parameters with chain length suggests that transition state binding also involves alkyl binding. , 1990b). g. Fig.

G. Bender, 1987). His point in doing so was to emphasize that it is the position of a substituent, rather than its electronic nature, that largely determines its effect on the acceleration of CD-induced phenyl acetate cleavage (Komiyama and Bender, 1978). This view is supported by the linear correlations of logk, with various parameters found by using multiple regression analysis (Matsui et a f . , 1985). The correlations also reveal an unfavourable steric term for para substituents, whereas bulky meta substituents improve the esterolytic ability, again consistent with the portrayals in Scheme 2.

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