metallacycloheptane metallacycloheptane metallacyclononane metallacyclononane
Without hydrogen With hydrogen Without hydrogen With hydrogen
β-agostic interaction 13.1 (6.1) 9.8 15.8 (2.9) 7.8
Two-step β-H elimination 12.4, 15.9 13.7, 16.9 13.9, 17.5 12.8, 19.8
Hydrogenolysis and β-H elimination - 15.8, 11.8 - 8.9, (4.1) 15.8
Ring expansion (0.3) 17.1 (2.4) 17.6 - -