Halfsandwiches and bent sandwiches
Paramagnetic halfsandwiches of the type 23, 24 and 25 have been investigated in view of subsequent transfer of the cyclopentadienyl-metal fragment to other π ligands; see publication list refs. 62, 89, 90, 93, 115, 137. Paramagnetic bent sandwiches 26 and their bridging has been documented in refs. 32, 36, 39, 40, 46, 48, 49, 61, 64.