625458-67-5

Basic information

• Product Name: [Ta(OC₆H₂Np-2-Bu(t)2-4,6)(NMe₂)4]
• CAS NO: 625458-67-5
• Molecular Weight: 688.731
• Mol File: 625458-67-5.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: [Ta(OC₆H₂Np-2-Bu(t)2-4,6)(NMe₂)4](CAS DataBase Reference)
• NIST Chemistry Reference: [Ta(OC₆H₂Np-2-Bu(t)2-4,6)(NMe₂)4](625458-67-5)
• EPA Substance Registry System: [Ta(OC₆H₂Np-2-Bu(t)2-4,6)(NMe₂)4](625458-67-5)

Safety Data

• Hazardous Substances Data: 625458-67-5(Hazardous Substances Data)

Upstream product

• 19824-59-0 pentakis(dimethylamido)tantalum 
• 219806-01-6 2-(1-naphthyl)-4,6-di-tert-butylphenol 

Relevant articles and documents

Structure, bonding, and reactivity of tantalum amides containing o-naphthyl- and o-indenylphenoxide ligation

The reaction of [Ta(NMe2)5] with the o-(2,3-dihydro-1-naphthyl)-, o-(1-naphthyl)-, and o-(inden-3-yl)phenols [HOC6H2Ar-2-Bu2t-4,6] (Ar = C10H9 (1), C10H7 (Np; 2), C9H7 (3)) has been investigated. In all three cases initial displacement of 1 equiv of dimethylamine occurs, yielding mono(aryloxides) [(ArO)Ta(NMe2)4]. Structural studies of the o-(2,3-dihydro-1-naphthyl) and o-(1-naphthyl) compounds 4 and 5 show they both adopt geometries best described as square pyramidal with an apical dimethylamido ligand and basal aryloxide oxygen. The Ta-O-Ar angles are 162° in both compounds, with no metal interaction with the ortho substituents. Compound 4 reacts with 2,3,5,6-tetraphenylphenol to form the corresponding bis(aryloxide) 6. The intermediate o-(inden-3-yl)phenoxide [(ArO)Ta(NMe2)4] 7 thermally eliminates a further 1 equiv of HNMe2 with formation of the tris(amido) compound [Ta(OC6H2{η1-Ind}-2-But-4,6)(NMe 2)3] 8. The coordination geometry about tantalum in 8 is best described as trigonal bipyramidal, with an oxygen and amido group in the axial positions: O-Ta-N = 170°. The carbon atom of the indenyl ring bound directly to the phenoxide nucleus is metalated, leading to a five-membered metallacycle. Hence, both deprotonation (CH bond activation) and tautomerization of the original inden-3-yl ring has occurred. The Ta-C(121) distance of 2.285(9) A is consistent with an η1-indenyl ring being present in 8. Replacement of the dimethylamido ligands in 8 by chloride groups was achieved by reaction with SiCl4. Structural analysis of the 4-phenylpyridine adduct [Ta(OC6H2{η3-Ind}-2- But-4,6)(NC5H4Ph-4)Cl3] 9 showed the presence of an η3-indenyl interaction with the tantalum metal center. The bonding parameters for the η1- and η3- indenyl rings are compared with those of related η5- cyclopentadienyl derivatives of niobium and tantalum.