The ligand exchange MX5 . L + \*L 8 MX, . \*L + L for the octahedral adducts MX, . L, in an inert solvent (CH2CI2 or CHCI,) with neutral ligands, proceeds via a dissociative D mechanism when M = Nb, X = C1 and L= phosphoryl compound. A dissociative interchange Id mechanism is suggested when M = N b
The Polymerization of Tetrahydrofuran Initiated by Niobium(V) and Tantalum(V) Halides
β Scribed by Fabio Marchetti; Guido Pampaloni; Timo Repo
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 266 KB
- Volume
- 2008
- Category
- Article
- ISSN
- 1434-1948
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## Abstract The adducts of niobium(V) and tantalum(V) halides with some phosphoryl compounds have been studied in chloroform solution by ^1^Hβ and ^19^FβFTβNMR. spectroscopy. These octahedral adducts of general formula MX~5~ Β· L (M = Nb, Ta; X = F, Cl, Br; L = phosphoryl ligand) are monomeric and n
## Abstract The relative stability of adducts formed by Nb(V) and Ta(V) pentachlorides and bromides with some dimethylchalcogenides and nitriles has been determined by ^1^HβNMR. in dichloromethane at β 60Β°. The stabilities are explained in terms of the HSAB principle and __JΓΈrgensen__'s symbiotic e
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