A synthetic, structural and reactivity study of [(η4-C4R4)Co(η5-C5H4X)] complexes, R=Me or Et; X=CHO, CHCHFc, CHCH(η5-C5H4)Co(η4-C4Ph4), CHC(CN)2: Unexpected formation of [(η5-cyclopentadienyl)(η4-3,4,5,6-tetraethyl-α-pyrone)cobalt]

Stilbene analogues incorporating the Co(η4-C4Ph4)(η5-C5H4-) end group

“…However in the case of the Z-isomer, following the second oxidation, a rapid cistrans isomerisation occurs and subsequent potential sweeps resemble those of E-6. The corresponding tetraethylcyclobutadienylcobalt complexes Z and E-12 [43] show similar behaviour, with the cobalt based oxidation predictably shifted cathodically by w300 mV as a consequence of the superior electron donor ability of the h 4 -C 4 Et 4 ligand compared with h 4 -C 4 Ph 4 .…”

Synthesis and characterization of difunctionalized derivatives of the cyclobutadiene linked dimeric cobalt sandwich compound [(η5-Cp)Co(η4-C4Ph3)]2

“…Compound 8 showed two different carbonyl stretching bands at 1657 cm À1 and 1699 cm À1 for the acetyl and ester groups respectively. 13 …”

The preparation, spectroscopy, structure and electrochemistry of some [Co(η4-C4Ph4)(η5-C5H4R)] complexes

“…Here they are used in a variety of reactions to prepare a diverse range of [Co(h 4 -C 4 Ph 4 )(h 5 -C 5 H 4 R)] complexes, some of which have been foreshadowed in our study of [Co(h 4 -C 4 R 4 ) (h 5 -C 5 H 4 R)] (R ¼ Me and Et) derivatives [10]. They include donorepacceptor systems, and mixed cobalt/ferrocene alcohols [Co(h 4 -C 4 Ph 4 ){h 5 -C 5 H 4 CH n (Fc) 2Àn OH}] (Fc ¼ ferrocenyl; n ¼ 0, 1).…”

“…Selected bond lengths ( A) CoeC 4 Ph 4 (cent) 1.695(1); CoeC 5 H 4 (cent) 1.680(1); C29eC34 1.5032(15); C34eP 1.8111(11). Selected bond angles ( ) C33eC29eC34 124.27(10); C30eC29eC34 128.05(10)…”