The reaction of (butadiene)tantalocene cation with bulky carbonyl derivatives

Diene complexes of early transition metals: ideas and progresses at Osaka University

“…Recently, Erker reported that a cationic diene complex of tantalocene [Cp 2 Ta(s-trans-g 4 -butadiene)] + (19), which is isoelectronic and isolobal to that of hafnocene and exhibits similar structural feature and reactivity [40][41][42][43].…”

11 Vanadium, niobium and tantalum

“…85 Activation of this complex with methylalumoxane yields an effective Ziegler^Natta catalyst, and it also reacts stoichiometrically with ketones to give non-planar seven-membered metallacycles, such as 2 formed with adamantanone. 86 Reactions of the metallacycles with various alkyl isocyanides have been studied, 87 and the preparations, crystal structures and reactions of some related tantalum systems containing the {(butadiene)(cot)(Cp)} ligand set have also been reported. 88 The ¢rst homoleptic isocyanides of niobium and tantalum, [M(CNXyl) 7 ](BF 4 ), have been prepared, and converted to [MI(CNXyl) 6 ].…”