Home > Organic Chemistry > Radical Halogenation of Alkenes (Antimarkovnikov)

Does Anti-Markovnikov behaviour extend only to additions to alkenes?

Answer 1

Madison Anderson

Anti-Markovnikov behaviour extends to other chemical reactions than additions to alkenes, but they are relatively rare.

For example, the hydration of phenylacetylene gives acetophenone in a Markovnikov addition.

#"PhC≡CH" +"H"_2"O" → "PhCOCH"_3#

But hydration in the presence of a complex ruthenium catalyst gives phenylacetaldehyde in an anti-Markovnikov addition.

A few other anti-Markovnikov reactions involving transition metal catalysts are also known.

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Answer 2

Ellie Adams

No, Anti-Markovnikov behavior is not limited to additions to alkenes. It can also occur in reactions involving alkynes and radicals.

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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.