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Dive into the research topics where Joseph Klein is active.

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Featured researches published by Joseph Klein.


Journal of The Chemical Society, Chemical Communications | 1986

Stable polycyclic anions: dianions from overcrowded ethylenes

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

Metallation reactions: the trimethylenemethane dianion

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

New heterocyclic dianions: n.m.r. characterization of 1,3-diphenylbenzo[c]-thiophene dianion, a stable 4nπ charged system containing sulphur

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

Substituted [24]paracyclophanes

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

Novel heterocyclic anions: benzo[b]thiophene dianion, the first sulphur doubly charged 4nπ system

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

Dilithiation of propene and allylbenzene and the structure of the dimetallated product

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

The charge alternation concept. Application to cyclic conjugated doubly charged systems

Yoram Cohen; Joseph Klein; Mordecai Rabinovitz


Journal of the American Chemical Society | 1969

Stereospecific addition of alkylcopper reagents to .alpha.,.beta.-acetylenic acids. The nature of the vinylic enolate

Joseph Klein; R. M. Turkel


Journal of the American Chemical Society | 1969

Metalation reactions. I. Formation and charge distribution in conjugated propargylic dianions

Joseph Klein; S. Brenner


Journal of the American Chemical Society | 1981

Aromatic polycyclic benzenoid tetraanions: pyrene and perylene anions revisited

Abraham Minsky; Joseph Klein; Mordecai Rabinovitz

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Mordecai Rabinovitz

Hebrew University of Jerusalem

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Yoram Cohen

University of California

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Abraham Minsky

Weizmann Institute of Science

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Elad Shabtai

Hebrew University of Jerusalem

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Shmuel Cohen

Hebrew University of Jerusalem

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