Abstract
A novel method for the synthesis of the homogeneous homoleptic cationic tantalum(V)tetramethyl complex [(TaMe4)+ MeB(C6F5)3−] from neutral tantalumpentamethyl (TaMe5) has been described, by direct demethylation using B(C6F5)3 reagent. The aforesaid higher valent cationic tantalum complex was characterized precisely by liquid state 1H-NMR, 13C-NMR, and 1H-13C-NMR correlation spectroscopy.
Highlights
Tantalum alkyl complexes are of vital importance in current organometallic chemistry, from the point of view of stoichiometric reactions and mainly in catalysis [1,2,3,4]
AsAsa apart research any tantalumpentamethyl complex, we report here program a program method to for the synthesis ofnovel the application homogeneous tantalumpentamethyl complex, we report here a method for the synthesis of the
The cationic homoleptic tantalum (V)-methyl complex has been synthesized via a straightforward strategy to address the will to get a more electrophilic metal centre, generating the straightforward strategy to address the will to get a more electrophilic metal centre, generating the first tantalum-based species with such a property
Summary
Tantalum alkyl complexes are of vital importance in current organometallic chemistry, from the point of view of stoichiometric reactions and mainly in catalysis [1,2,3,4]. In our previous communication [9], we checked that grafting this unstable TaMe5 complex to the silica surface by a Surface Organometallic Chemistry (SOMC) strategy enhances its thermal stability due to the formation of the stable grafted (≡Si-O-)TaMe4 The latter complex proved to be a nice precursor for alkane metathesis, leading to the formation of a surface monopodal tantalum methylidene dimethyl catalyst [9,10]. With the precedents of Buchmeiser and co-workers who developed the first cationic tungsten-oxo-alkylidene-NHC complex (NHC = N-heterocyclic carbene) [11,12], where the NHC was introduced to stabilize the cationic metal centre, together with the tungsten based cationic complex WMe5 + [13], to improve the catalysts in terms of reactivity and selectivity, and taking into account the idea of increasing the electrophilicity on metal centre, we deepened into the idea of generating the cationic species of TaMe5 This change planned to enter the field of predictive catalysis. Containing ligands [19,20,21]
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