[header] How to study reactive intermediates [title] Note that an organic reaction occurs in one of two ways. [substeps] The first way is through a concerted reaction that takes place in a single step, with only one transition state. The second way is through a non-concerted reaction, which results in intermediate structures consisting of highly reaction carbon species. 
This is the dominant sort of chemical reaction. [title] Observe organic reactions using a special spectroscopic technique.