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8.6 INFORMATION CONTAINED IN A MECHANISM
Let's look at each one at a time.
The outcome will be stereochemical.
There are issues of stereochemistry.
In the next few chapters, we will see a few specific examples.
Any proposed mechanism has to account for this observation.
Not all substitution reactions proceed with racemization when we cover them.
The mechanism must account for this observation, and it will be different than the mechanism shown above.
There are two different mechanisms for substitution reactions.
Stereochemistry is not limited to substitution reactions.
Stereochemistry can't be avoided if you think you can.
Stereochemistry will continue to be a theme as we move from chapter to chapter.
In Chapter 11 we will see that this is also true of addition reactions.
We will analyze the stereochemical outcome in each case, and learn many different kinds of addition reactions.
There are two new stereocenters formed in the process.
We only observe two of the stereoisomers.
Stereochemical outcome of reactions has been the focus of this section so far.
When a reaction can give products that are constitutional isomers, regiochemistry is important.
The double bond can be formed in one of two places, depending on which proton is removed in the process.
The two products are not stereoisomers.
They are constitutional isomers.
This is an issue of regiochemistry if we ask which product dominates.
One alkene is the major product, and any proposed mechanism must justify this regiochemical observation.
The OH group is installed at the position that does not bear the R group.
The OH group is not installed at the position bearing the R group.
The product would be a constitutional isomer.
This is a problem of regiochemistry.
Any proposed mechanism must justify the regiochemical observation.
There is a mechanism that must justify both the stereochemical and regiochemical outcomes of a reaction.
Students try to memorize the outcomes of every reaction.
There are many reactions to this method of studying and it will be difficult to move through the course.
It is difficult to remember all of the details.
You will be able to remember the details of each reaction more easily if you focus on understanding the proposed mechanism for each reaction.
Each mechanism will help you remember the details of the reaction.
All of the experimental observations must be explained by a mechanism.
You should be able to draw the entire mechanism on a blank piece of paper.
It's important to do that for every new mechanism.
When it is not fresh in your mind, wait a day and do it again.
You need to get to a point where you can draw the entire mechanism on a blank sheet of paper.
You will find that your understanding of organic chemistry will be greatly enhanced if you discipline yourself to perform this exercise.
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