Work authorization terms Links

Borovik et al. [70] prepared a highly crosslinked polymeric porous material containing Co-salen units 38 (Figme 13) by template copolymerization method. The authors reported that as the cross-linking degree increases from 5 % to 50 %, the catalyst become more efficient in terms of reactivity, possibly due to the improved proximity of metal centers that work in cooperation. Unfortunately low enantioselectivity for the product epoxide was observed (<42 % ee) while the ee for concomitantly produced diol did not go above 86%. Reusability of the catalyst containing 50 mol% template showed consistent activity and enantioselectivity for three consecutive recycle experiments. 

Guldberg and Waage also initially experienced difficulties in finding the proper exponents involved in the description of the variations in the concentrations of the different substances this problem was resolved in 1887, in terms of molecular kinetic theory. However, far more importantly, these authors did not manage to distinguish the rate laws (what we would call today the initial conditions) from the derivatives of the equilibrium conditions. This considerably complicated and delayed the future development of chemical kinetics. The dynamic nature of chemical equilibrium was never in doubt. However, the complexity of the systems was far from being considered and the link between equilibrium and kinetics was weak. The works of Harcourt and Esson are models of meticulous experimental and theoretical work, but on reading them, it is also obvious that these authors had to confront many conceptual and technical problems. Their kinetic studies... 

---