A. K. Narula

Synthesis of organomagnesium β-diketonates and alkoxides

Abstract Phenyl- and butyl-magnesium β-diketonates, [RMg(R′C(O) C(H) C(O)-R″)]·THF (where R  C 6 H 5 or C 4 H 9 ; R′ and R″  C 6 H 5 or CH 3 ) have been made by the reaction of phenyl- or butyl-magnesium bromide with sodium β-diketonates and Cu II β-diketonates. Phenyl- and butyl-magnesium alkoxides [RMgOR‴] (where R‴  CH 3 , C 2 H 5 , i C 3 H 7 , i C 4 H 9 , t C 4 H 9 ) have been made by treatment of phenyl- or butyl-magnesium bromide with the appropriate sodium alkoxides.

N-(Aryl)-2-mercaptoacetamide derivatives of dichlorobis(cyclopentadienyl)hafnium(IV)

Abstract Dichlorobis(cyclopentadienyl)hafnium(IV) in THF in the presence of triethylamine reacts with N -(α-naphthyl)-2-mercaptoacetamide (NMAH), N -phenyl-2-mercaptoacetamide (PMAH), N -( o -tolyl)-2-mercaptoacetamide ( o -TMAH), N -( m -tolyl)-2-mercaptoacetamide ( m -TMAH), N -( p -tolyl)-2-mercaptoacetamide ( p -TMAH) and N -(3,5-dimethylphenyl)-2-mercaptoacetamide (DMPMAH) in various stoichiometric ratios, to give complexes of the types Cp 2 Hf(MA)Cl and Cp 2 Hf(MA) 2 (where MA − represents the anion of corresponding bidentate mercaptoacetamide). These were characterized by elemental analysis, and IR, PMR and electronic spectroscopy. Magnetic susceptibility data show that the complexes are diamagnetic.

HETEROCARBOXYLATES OF BIS-(CYCLOPENTADIENYL)HAFNIUM(IV) DICHLORIDE

Abstract The reactions of dichlorobis(cyclopentadienyl)hafnium(IV) with 3-indoleacetic acid (IAH), 3-indole propionic acid (IPH), 3-indolebutyric acid (IBH) and 1-tryptophan (TRH) in various stoichiometric ratios have been studied, and the complexes of the type C 2 Hf(L)Cl and CpHf(L) 2 Cl(where L is the bidentate 3-indole carboxylate ion) were obtained. Magnetic susceptibility data that these complexes are diamagnetic.

Synthesis and Characterisation of Some Thiophenecarboxylates of bis(Cyclopentadienyl)Hafnium(IV) Chloride

Abstract The reactions of hafnocene dichloride with 2-thiophene-carboxylic acid (2-TCH), 2-thiopheneacetic acid (2-TAH), 3-thiophenecarboxylic acid (3-TCH), 3-thiopheneacetic acid (3-TAH), and 4-(2)-thienylbutyric acid (2-TBH) in various stoichiometric ratios have been studied, and complexes of the type Cp2Hf(L)cl and CpHf(L)2Cl (where L is the bidentate thiophenecarboxylate ion) were obtained. Magnetic susceptibility data suggest that these complexes are diamagnetic. Referee I: L. Brammer Referee II: J. L. Hubbard

Aroylhydrazone Derivatives of Titanocene and Zirconocene Dichloride

Abstract Reaction of titanocene and zirconocene dichloride with ethyl pyruvate aroylhydrazones [viz., ethyl pyruvate picolinoylhydrazone (EPPHyH), ethyl pyruvate furanoylhydrazone (EPFHyH) and ethyl pyruvate thiaphenoylhydrazone (EPTPHyHJ yield complexes of the type Cp2M(L)n C12-n (where M = Ti or Zr, n = 1 or 2 and L = ethyl pyruvate aroylhydrazone anion). The complexes have been characterised on the basis of elemental analyses, IR, PMR, 13C NMR and electronic spectra. The magnetic susceptibility data indicate the complexes to be diamagnetic.

SYNTHESIS AND STRUCTURAL STUDIES ON FOURAND SIX-COORDINATED COMPLEXES OF (BUTYL/ETHYL)PHENYLTIN DICHLORIDES WITH ALKYL PYRUVATE AROYLHYDRAZONES

The synthesis and spectroscopic characterization of 4-and 6-coordinated diorganotin(IV) complexes of the type RPhSn(L)nCl2 n where R = butyl or ethyl, η = 1 or 2, LH = methyl pyruvate benzoylhydrazone (MPBHyH), ethyl pyruvate benzoylhydrazone (EPBHyH), methyl pyruvate nicotinoylhydrazone (MPNHyH), ethyl pyruvate nicotinoylhydrazone (EPNHyH), methyl pyruvate isonicotinoylhydrazone (MPINHyH) and ethyl pyruvate isonicotinoylhydrazone (EPINHyH) are described.