K. C. Malhotra

Synthesis and characterization of monochlorotetrakis(4-t.Butylphenoxo)tantalum(V) and its behaviour in the presence of lewis acids and bases

Abstract Monochlorotetrakis(4-t.butylphenoxo)tantalum(V), TaCl(OC6H4But-4)4 (I), has been synthesized by reacting TaCl5 and 4-t.butylphenol (4-BUtC6H4OH) in a 1:4 molar ratio in benzene under reflux and characterized by elemental analysis, molar conductance and molecular weight determination, IR, NMR and mass spectral studies. Reactions of I with ca equimolar amounts of some aliphatic amines yield 1 : 1 addition compounds, whilst with strong chloride ion acceptors it behaves as a chloride ion donor thus indicating the formation of ionic compounds of the type [Ta(OC6H4But-4)4]+[MCl−4].

Acceptor properties of titanium(IV) phenoxides

SummaryCompounds of composition TiCl4−n(OPh)n · 2L (L = monodentate ligand, n = 1–4) have been prepared by the reaction of the parent titanium phenoxides (1 mol) with the ligand (2 mols) and characterized by elemental analysis, molar conductance, molecular weight and i.r. spectral studies.

Addition compounds of monophenoxy-and diphenoxy-niobium(V) and tantalum(V) chlorides with some phosphoryl and amine oxide ligands

SummaryCompounds of composition MCl5−n(OPh)n · L (M = Nb or Ta; n = 1 or 2 and L = monodentate ligand) have been prepared by reacting phosphoryl and amine oxide ligands with phenoxy-niobium(V) and -tantalum(V) chlorides and characterized by their analytical data, molecular weights, molar conductance and i.r. spectra.

Thermal studies of some aryloxides of titanium(IV)

Thermal behaviour of aryloxides of titanium(IV) of composition TiCln(OAr)4−n (wheren=0→3 and OAr=OC6But-4, OC6H4OMe-4 and OC6H2-Bu2t-2,6−Me-4) has been studied by DTA and TG analysis. Multiple decomposition steps have been indicated by thermal weight losses which are both exothermic and endothermic as shown by DTA curves. Based upon the total % loss in weight; during entire decomposition titanium dioxide has been found to be the final residue in each case.

Acceptor properties of titanium 2-naphthyloxides

Abstract The behaviour of 2-naphthyloxy titanium compounds towards several aromatic tertiary bases has been studied and a number of complexes TiClx(OC10H7)4-x, Ly(x = 0 − 4; L = tertiary base) have been isolated and their properties studied by spectroscopic and thermogravimetric techniques.

4-t-Butylphenoxo complexes of oxovanadium(V)

SummaryComplexes of composition [VOCl2(OC6H4Bu-t-4)] (1) and [VOCl(OC6H4Bu-t-4)2] (2) have been synthesized by the reaction of VOCl3 with equimolar and bimolar amounts, respectively, of 4-t-BuC6H4OSiMe3 in CCl4 and characterized by physio-chemical techniques. The complexes react with α-hydroxyaldehydes and ketones such as 2-hydroxybenzaldehyde (salicylaldehyde, salH), and 2-hydroxy-2-phenylacetophenone (benzoin, benzH), 2-hydroxyacetophenone (hapH) and also with the potassium salt of p-chlorobenzohydroxamic acid (KBHACl) in 1∶1 and 1∶2 molar ratios, to yield five- and six-coordinate complexes.

Synthesis, Characterisation and Reactivity of Tris(4-Tert-Butylphenoxo)Vanadyl(V)

Abstract A compound of the composition VO(OC6H4Bu-t-4)3 (I) has been synthesized by reacting VOC13 and Me3SiOC6H4Bu-t-4 in 1:3 molar ratio in anhydrous carbon tetrachloride. It was characterized by elemental analyses, conductance, molecular weight determination, 1H nmr and i. r. spectral studies. Reactions of (I) with 2,2′-bipyridyl, 1,10-phenanthroline and some aliphatic amines in 1:1 or 1:2 molar ratio have also been investigated.

Preparation and characterization of monochlorotris(4-tert-butylphenoxo)titanium(IV)

Abstract Monochlorotris(4-tert.-butylphenoxo)titanium(IV) ( 1 ) has been prepared from titanium tetrachloride and 4-tert.-butylphenol and characterized by elemental analysis, IR, NMR and mass spectral studies. The 1:1 addition compounds of 1 with some aliphatic amines have also been prepared. The behaviour of this compound in the presence of strong chloride ion acceptors such as AlCl 3 , FeCl 3 , SbCl 3 and PCl 5 and SbCl 5 has been studied using conductance techniques.

Reactions of pentakis (4-t-butylphenoxo)tantalum(V) with α-hydroxyaldehydes and ketones

SummaryThe Tav complex [Ta(OC6H4-t-Bu-4)5] (1) prepared by the reaction of TaCl5 with 4-t-butylphenol reacts with hydroxyl containing substrates, containing labile protons, such as benzoin, 2-hydroxyacetophenone and salicylaldehyde in 1∶1 and 1∶2 molar ratios to yield six and seven coordinate complexes of composition [Ta(OC6H4-t-Bu-4)4·L] and [Ta(OC6H4-t-Bu-44)3·L2].

A study of the interaction of di-μ-phenoxobis(dichlorophenoxo)molybdenum(V) with aliphatic amines

Abstract The compound [MoCl 2 (OC 6 H 5 ) 3 ] 2 reacts with various aliphatic amines such as n -propylamine, n -butylamine, sec -butylamine, t -butylamine, diethylamine, di-isopropylamine and triethylamine under different experimental conditions to give complexes of 1 : 1 stoichiometry. The complexes have been characterized by elemental analysis, conductance measurements, molecular weight determinations and IR spectral studies. An octahedral configuration is proposed for all the complexes.