S,S-Diorgano Derivatives of the P₂N₄S₂ Ring

Lithium Halide Adducts, Unsymmetrical Derivatives and Conformational Isomers

Rainer Vollmerhaus Department of Chemistry, The University of Calgary, Calgary, Alberta, Canada, T2N 1N4

Robert W. Hilts Department of Chemistry, The University of Calgary, Calgary, Alberta, Canada, T2N 1N4

Masood Parvez Department of Chemistry, The University of Calgary, Calgary, Alberta, Canada, T2N 1N4

Xiaoliang Gao Department of Chemistry, The University of Calgary, Calgary, Alberta, Canada, T2N 1N4

Tristram Chivers Department of Chemistry, The University of Calgary, Calgary, Alberta, Canada, T2N 1N4

Abstract

The reaction of [Li(Ph₄P₂N₄S₂R)THF]₂ with alkyl iodides R′I produces the msymmetrically substituted derivatives Ph₄P₂N₄(SR)(SR′) as lithium iodide adducts. The coordinated LiI is readily removed in CH₃CN or CH₂Cl₂ to give the eight-membered rings in a boat conformation (∂ ³¹P = 14–17 ppm). The boat conformers readily isomerize to the corresponding chair somers (∂ ³¹P = 25–29 ppm) upon gentle heating.

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S,S-Diorgano Derivatives of the P₂N₄S₂ Ring

Lithium Halide Adducts, Unsymmetrical Derivatives and Conformational Isomers

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S,S-Diorgano Derivatives of the P2N4S2 Ring

Lithium Halide Adducts, Unsymmetrical Derivatives and Conformational Isomers

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S,S-Diorgano Derivatives of the P₂N₄S₂ Ring