Activation energies for the 1,2-carbon migration of ring-fused cyclopropylchlorocarbenes
Fused-ring cyclopropylchlorocarbenes 2 and 3 ring expand to fused-ring chlorocyclobutenes 10 and 11, respectively, with activation energies of 3-4 kcal/mol and activation entropies of ~-20 e.u. Carbon tunneling appears to be unimportant at low temperatures.
Chu, Gaosheng,Moss, Robert A.,Sauers, Ronald R.,Sheridan, Robert S.,Zuev, Peter S.