What does it mean if the Diels Alder reaction is a concerted reaction?

Answer 1

It means that all the bonds are formed and broken simultaneously.

Let's begin with something more commonly encountered: Compare the reaction between #"S"_N1# and #"S"_N2#.

#color(green){"S"_N1" Mechanism"}#

#color(green){"S"_N2" Mechanism"}#

The #"S"_N2# reaction is concerted. No intermediates are formed and there is only a single transition state.

The Diels-Alder reaction also involves no intermediates. An example of Diels-Alder reaction between 1,3-butadiene and ethene is shown below.

All the electrons move simultaneously. The old bonds are broken at the same time as the new bonds are formed.

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Answer 2

The Diels-Alder reaction being concerted means that it occurs in a single step without intermediate stages. All bond formations and breaking happen simultaneously.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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