Here the geometry of the transition state is prohibitive , but an alkyl group , due to the nature of its orbitals , can invert its geometry , form a new bond with the back lobe of its sp3 orbital , and therefore proceed via a suprafacial shift .
But an alkyl group , due to the nature of its orbitals , can invert its geometry and form a new bond with the back lobe of its sp3 orbital .