NOTE: Important charges and non-bonding electrons are shown throughout the animation except during the transition state phase.
Click the structures and reaction black arrows in sequence to view the 3D models and animations respectively
This method is commonly used to make five membered rings. This is due to the selectivity of smaller ring sizes over bigger sizes. The reaction proceeds via an abstraction of iodine by a trimethyltin radical. The chain can then twist into a position to cyclise. The abstraction of hydrogen from trimethyltinhydride by the methylcyclopentane radical to form the exo product is not shown.
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