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tantalum/dichloromethane

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StraipsniaiKlinikiniai tyrimaiPatentai
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Synthesis, X-ray characterization, and reactivity of α-aminoacidato ethoxide complexes of niobium(V) and tantalum(V).

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High yields of the ethoxo-α-aminoacidates of the general formula M(OEt)4[OC(O)CHRNHR'-κO,κN] (M = Nb, R = CH2Ph, R' = H, 2; R = CHMe2, R' = H, 3; R = CH2CHMe2, R' = H, 4; R = H, R' = Me, 5; R = CH2CH2SMe, R' = H, 6; M = Ta, R = CH2Ph, R' = H, 7; R = CH2CH2SMe, R' = H, 8) and

Liquid-liquid extraction, separation recovery and transport of tantalum by crown-ether.

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A solvent extraction, separation, preconcentration method and recovery of tantalum is reported. Tantalum is extracted with dibenzo-18-crown-6 (DB18C6) in dichloromethane in presence of niobium from 4 M hydrochloric acid. The transport of tantalum(V) ions through a supported liquid membrane
Treatment of p-tert-butylcalix[6]areneH(6) (H(6)tBu-L) or p-tert-butylcalix[8]areneH(8) (H(8)tBu-L(1)) with [MCl(5)] (M=Nb, Ta) in refluxing toluene or dichloromethane affords, after work-up, the complexes [{M(NCMe)Cl(2)}(2)(tBu-L)] (M=Nb (1), Ta (2)) and [(MCl(2))(2)(tBu-L(1)H(2))] (M=Nb (4), Ta

Synthesis of α-amino acidato derivatives of niobium and tantalum pentahalides and their conversion into iminium salts.

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Dinuclear complexes of formula Nb2Cl9[O2CCH(R)NR'R″2-κO,κO] (R = CH2CHMe2, R' = R″ = H, 1a; R = CH2Ph, R' = R″ = H, 1b; R = CH2CH2SCH3, R' = R″ = H, 1c; R = R' = H, R″ = Me, 1d; R = CH2Ph, R' = R″ = Me, 1e; Nb2Cl9[O2C⌈CH(CH2)3NH⌉], 1f) were prepared by allowing NbCl5 to react in dichloromethane with

Mu-oxo-bis[eta5-1,2-dicarbaundecarboato)bis(N,N-dimethylacetamidinato)-tantalum] dichlooromethane hemisolvate.

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The structure of the title compound, [Ta2O(C2B9H11)2(C4H9N2)4]*0.5CH2Cl2, contains two (C2B9H11)Ta[NC(Me)NMe2]2 units bridged by a nearly linear [Ta-O-Ta 163.4 (4) degrees ] mu-oxo ligand. The dichloromethane molecule lies on a twofold axis.

Synthesis, Structure, and Properties of Group 4 and 5 Metal Pyrazolato Chloride Complexes.

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Treatment of titanium tetrachloride with 3,5-di-tert-butylpyrazole (2 equiv) and triethylamine (2 equiv) in toluene afforded dichlorobis(3,5-di-tert-butylpyrazolato)titanium(IV) (93%). A similar reaction with 3 equiv of 3,5-di-tert-butylpyrazole and triethylamine gave
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