Grignard Reagent
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... her as a solvent. When this reaction is complete -- 2. Second propanal is added (CH3CH2CHO) to this solution. After the second reaction is complete -- 3. Third HCl is added to neutralize the O- and make the alcohol. This represents a sequence of events in carried out in the laboratory. In each numbered step all the reactants present are allowed to react before the next reaction is started. At the completion of each numbered step, the product could (in principle) be isolated and stored to be used later. In practice the high reactivity of water with Grignard reagents makes this very difficult, so it is not done. This way of describing a sequence of laboratory events must not be confused with the sequence of steps which are used to describe a mechanism. When describing a mechanism one is tracing the path of single molecule at a time. At a given time, very few molecules are actually reacting; most are "resting" as either reactants which haven't gotten enough energy to proceed or ...
