Bicyclic nonatrienes also undergo [ 1,7 ] shifts in a so-called walk rearrangement , which is the shift of divalent group , as part of a three-membered ring , in a bicyclic molecule .
Bicyclic nonatrienes also undergo [ 1,7 ] shifts in a so called walk rearrangement , which is the shift of divalent group , as part of a three-membered ring , in a bicyclic molecule .