With respect to the unsubstituted Cp complex (D1), coordination
of H2 in HG (h) is slightly hindered by addition of a substituent
to the Cp ligand (D2) or by changing Cp to Ind (H14), which is
apparently due to steric effects. Addition of a bridge (D5) has practically
no influence. The relative energy is highest for D5 in the TS,
reversing the order of the catalysts in the hydrogenolysis. D2 and
H14 have increased energies relative to the unsubstituted Cp
(D1). The relative stabilities of the products (j) are in line with
the relative stabilities of the transition states.