How to decide which rxn is anti markovnikov and which one obeys markovnikov rxn ? How to decide whether it is homolytic cleavage or heterolytic cleavage

Dear Student,

The markovnikov rule predicts the regiochemistry by addition of HX on unsymmetrical substituted alkenes, the HX bond in halide component are highly substituted carbon atom while hydrogen atom prefers existing hydrogen atoms high in number.


The reaction which does not follows markovnikov rule results in isolated anti-markovnikov compounds and the example of hydroboration reaction scheme is expressed below,

The mechanism of markovnikov reaction scheme is expressed below,


Hemolytic cleavage often takes place in non-polar bonds and is favoured by high temperature, ultraviolet radiations and by the presence of radical initiators such as peroxides.

Heterolytic cleavage often takes place in non-polar bonds and is favoured by high temperature, ultraviolet radiations and by the presence of radical initiators such as peroxides.

Regards.
 

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