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Publication
Featured researches published by Joseph Klein.
Journal of The Chemical Society, Chemical Communications | 1986
Yoram Cohen; Joseph Klein; Mordecai Rabinovitz
Stable overcrowded ethylene dianions, viz. bifluoren-9-ylidene dianion (1)2– and bi-(4H-cyclopenta[def]phenanthren-4-ylidene) dianion (2)2– were prepared via metal reduction and characterized by 1H and 13C n.m.r. spectroscopy; the spectroscopic results as well as ωβ calculations performed on the hydrocarbons (1) and (2) and the corresponding dianions (1)2– and (2)2– are discussed with respect to their diatropicity and spatial structure.
Journal of The Chemical Society, Chemical Communications | 1973
Joseph Klein; Ayala Medlik
Metallation of isobutene in the presence of tetramethylenediamine gave consecutively the methylallyl anion and the trimethylenemethane dianion.
Journal of The Chemical Society, Chemical Communications | 1987
Yoram Cohen; Joseph Klein; Mordecai Rabinovitz
1,3-Diphenylbenzo[c]thiophene dianion, (1)2– a member of the novel series of 4nπ polyheterocyclic dianions, has been prepared and characterized by n.m.r.; it shows a high stability and a peculiar charge distribution pattern in which the sulphur atom polarizes the charge towards the α-positions.
Journal of The Chemical Society-perkin Transactions 1 | 1997
Elad Shabtai; Daphna Frenkiel; Shmuel Cohen; Mordecai Rabinovitz; Joseph Klein
Synthesis, characterization and stereochemistry of new derivatives of [24]paracyclophane, containing carboxylic acid ester groups, are described.
Journal of The Chemical Society, Chemical Communications | 1985
Yoram Cohen; Joseph Klein; Mordecai Rabinovitz
Benzo[b]thiophene dianion (1)2–, the first sulphur-containing 4nπ polycyclic dianion, was prepared via metal reduction and characterised by 1H and 13C n.m.r. spectroscopy; the reaction products depend on the reduction conditions.
Journal of The Chemical Society, Chemical Communications | 1975
Joseph Klein; Ayala Medlik-Balan
Propene and allylbenzene have been metallated to give dilithio derivatives and the structure of the dilithio derivative of the latter has been suggested.
Journal of the American Chemical Society | 1988
Yoram Cohen; Joseph Klein; Mordecai Rabinovitz
Journal of the American Chemical Society | 1969
Joseph Klein; R. M. Turkel
Journal of the American Chemical Society | 1969
Joseph Klein; S. Brenner
Journal of the American Chemical Society | 1981
Abraham Minsky; Joseph Klein; Mordecai Rabinovitz