All Publications

Yuval Halpern and Nissim. Garti. 1975. “Arylmercury compounds. Part VI. Asymmetric diarylmercury compounds.” Israel Journal of Chemistry, 13, 3, Pp. 205–211. Abstract
Asymmetrical diarylmercury compds., e.g. p-MeOC6H4HgC6H4NMe2-p, were produced together with sym. products via a symmetrization process. The asym. products could not be isolated from the reaction mixt. and their existence was indicated through different analyses (m.p., IR, PMR, mass spectra, elemental analysis and DTA). The asym. products are unstable and disproportionate into two sym. compds. at elevated temps., and in org. solvents even at room temp. [on SciFinder(R)]
Yuval Halpern and Nissim. Garti. 1975. “Arylmercury compounds. IV. Symmetrization in the absence of auxiliary ligand.” Journal of Organometallic Chemistry, 88, 3, Pp. 315–320. Abstract
PhHgOAc is converted into Ph2Hg via a symmetrization process, in the absence of an auxiliary ligand, at 6.5≥pH\textgreater4.0. Arylmercuric salts, in which the arom. rings contain more than 1 electron donating group, symmetrize in the absence of an auxiliary ligand at a basic pH. Both processes proceed in water or in mixts. of org. solvents and water. The factors influencing the symmetrization at different pH values are discussed. [on SciFinder(R)]
Y HALPERN and N Garti. 1975. “Arylmercury compounds. VI. Proposed mechanism for the symmetrization of arylmercuric salts in the presence of chelating agents.” Journal of Organometallic Chemistry, 92, 3, Pp. 291–301. Abstract
The mechanism for the symmetrization of arylmercuric salts in the presence of chelating agents includes 3 main steps: (i) dissocn. of the arylmercuric salt; (ii) formation of a reactive complex between the ionized arylmercuric salt and the chelating agent; (iii) an electrophilic substitution at a C-Hg bond via a 2-electron, 3-center bond type transition state. The effect of chelating agents on the reactions of PhHgOAc with piperidine, BuNH2, or CNS- to give Ph2Hg and of m-MeC6H4HgOAc with tetra-Na ethylenediaminetetraacetate to give (m-MeC6H4)2Hg was discussed. [on SciFinder(R)]
Yuval Halpern and Nissim. Garti. 1975. “Arylmercury compounds. III. Poly(arylmercury) compounds via symmetrization reactions.” Journal of Applied Chemistry & Biotechnology, 25, 6, Pp. 403–410. Abstract
Treatment of 4 compds. of the type Ar(HgX)2 and of poly[4-(acetoxymercurio)styrene] with EDTA tetra-Na salt [64-02-8] and NH3 [7664-41-7] resulted in symmetrization and polymn. of the monomers and crosslinking of the polystyrene [9003-53-6] by Hg [7439-97-6]. E.g., 2,5-bis(chloromercurio)thiophene gave poly(mercurio-2,5-thiophenediyl) [57715-35-2]. [on SciFinder(R)]
Yuval Halpern and Nissim. Garti. 1974. “Production of diarylmercury compounds.” Israel 45319. Abstract
A high yield recyclization and pollution free process for the manuf. of diarylmercury compds. is described. The new process enables saving of starting materials and recovery of Hg. [on SciFinder(R)]

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