Reaction Mechanisms in Homogeneous Systems

Another example is the bonding of the sulfur atoms in S2O3 . This was prepared by heating a solution of SOj with sulfur labelled with filtered and decomposed by addition of acid. was only found in the sulfur fraction, which is a proof that the sulfur atoms in differ in bonding. In both examples, the results are unambigu- 

Radiotracer methods are the methods of choice for investigation of reaction mechanisms. They have also found broad application for determination of kinetic data of chemical reactions such as reaction rates, activation energies and entropies. Only a few examples can be given of the multitude of applications in organic, inorganic and physical chemistry and in biochemistry. 

For instance, the Claisen allyl rearrangement has been elucidated by labelling with 

By investigation of the decomposition products it has been proved that the terminal C atom of the allyl group forms a new bond with the benzene ring. 

R = k C (first-order reaction) or 1 R = k2C C2 (second-order reaction) / 

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