Bhuvan C. Pant

Triphenylplumbyl-containing p,p′-disubstituted 1,3-diphenyltetramethyldisiloxanes

Abstract Compounds of the type where R=(C 6 H 5 ) 3 Pb; (C 6 H 5 ) 3 Pbs; (C 6 H 5 ) 3 PbOOC were synthesized. Physical properties and analytical data of the new compounds are reported. Infrared, nuclear magnetic resonance and thermal data are discussed.

Organotellurium chemistry : I. Synthesis, reactions and spectral characteristics of diaryltellurium diacetates

Abstract Diaryltellurium diacetates have been prepared in excellent yields by the oxidation of diaryltellurides with lead tetraacetate and also by the reaction of diaryltellurium dichlorides with silver acetate. Hydrolysis, reduction and exchange reactions of these derivatives and their spectral data are described.

Organotellurium carboxylates and related compounds: Structural and synthetic considerations

Summary The structures of Ph 2 Te(OOOCH 3 ) 2 , Ph 2 Te(OOOPh) 2 and ( p -EtOC 6 H 4 ) 2 -Te(OOCCH 3 ) 2 are considered to be based on a four-coordinate ψ-trigonal bipyramidal arrangement of groups about the central tellurium atom. There is evidence for non-equivalence of carboxylate groups in both the solid state and in solution for Ph 2 Te-(OOOPh) 2 and for ( p -EtOC 6 H 4 ) 2 Te(OOCCH 3 ) 2 . The carboxylate groups are as “ester”-like as in related organotin compounds. Attempts to isolate organotellurium triacetates from solution gave only mixtures of hydrolysis products. The spectrum of Ph 2 Te(NO 3 ) 2 is less readily interpreted but the balance of evidence favours a monomeric structure with unidentate or very unsymmetrically bidentate nitrate groups.

Cleavage reactions of the leadCarbon bond III. The reaction of tetraorganolead and hexaorgano- dilead compounds with ammonium hexachloroplumbate

Abstract Triorganolead chlorides have been prepared in excellent yields by thereaction between tetraorganolead compounds and ammoniumhexachloroplumbate in benzene or tetrahydrofuran at ambient temperature. The reaction wasextended to cleavage of the metal metal bond ofhexaorganodi-Group IV element derivatives. A tentative mechanism is proposed.

Cleavage reactions of the lead-carbon bond : IV. Synthesis of some aryltellurium halides using organo-lead compounds☆

Abstract Aryltellurium chlorides have been prepared in excellent yields by the reaction between triaryllead chlorides and tellurium tetrachloride or aryltellurium trichlorides in benzene at room temperature.

Acetylenic derivatives of lead

Abstract Acetylenic derivatives of lead containing one, two or four acetylenic groups around the central lead atom have been synthesized via the reaction of the appropriate lithium acetylide with aryllead halides or potassium hexachloroplumbate in tetrahydrofuran at low temperatures. The expected products were obtained in excellent yields.

Organometallic acetylenes of phosphorus, arsenic and antimony. Synthesis and spectral data of tris(3,3-dimethyl-1-butynyl) derivatives☆

Trialkynylphosphines, arsines and stibines have been synthesized and investigated during the past five years ‘s2 Phosphorus derivatives have been studied _ in detai13. In an earlier publication, we reported that tert-butyl groups stabilize the organometallic acetylenes4. Since the trialkynyl derivatives of the fifth main group are not very stable (the triethynyl compounds are explosive), we prepared the corresponding tris(3,3dimethyl-l-butynyl) derivatives to establish the possibility of a similar stabilizing effect in these compounds_ Synthesis and reactions of these compounds may be represented by the following equations where M = P, Sb or As :

Organometallic acetylenes of group iva elements. Synthesis and spectral data of tetrakis(tert-Butylethynyl) derivatives

Abstract The tetrakis(tert-butylethynyl) derivatives of group IVA elements have been synthesized via the reaction of the tert-butylethynyllithium with the tetrachlorides or hexachloro salt in tetrahydrofuran at low temperatures. The expected products were obtained in excellent yields. The tetrakis(tert-butylethynyl) derivatives of silicon, germanium, tin, and lead exhibited a remarkably greater thermal and hydrolytic stability than other corresponding tetraacetylenic derivatives.

Cleavage reactions of the lead-carbon bond : II. The reaction of tetraorganolead compounds with 1-chloro-1,2,3-benzotriazole

1-(Triorganoplumbyl)-1,2,3-benzotriazoles were synthesized in excellent yields by the cleavage of an organic group from tetraorganolead derivatives with 1-chloro-1,2,3-benzotriazole in benzene at 50–60°. The order of ease of cleavage of organic groups by 1-chloro-l,2,3-benzotriazole in the case of mixed-tetraorganolead compounds is discussed.

Cleavage reactions of the leadCarbon bond : I. The reaction of tetraorganolead compounds with N-bromosuccinimide

Abstract Facile and specific cleavage of leadcarbon bonds has been found to occur when symmetrical and unsymmetrical tetraorganolead compounds are treated with N -bromosuccinimide in hydrocarbon solvents. Physical and chemical properties of the N -(triorganoplumbyl)succinimides obtained are discussed. An exclusive cleavage of the leadnitrogen bond was observed in the reactions of N -(triorganoplumbyl)succinimides with acetic acid.