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- W243733273 abstract "The synthesis of the nonsymmetrical and the optically active trans-1,2-diphosphinylethenes has been accomplished. The employed addition-elimination route is potentially general and utilizes readily accessible secondary phosphine oxides and tertiary 1-halogenovinyl phosphine oxides. Sterically crowded secondary phosphine oxides afford nonsymmetrical 1,2-diphosphinylethenes directly by heating with the corresponding 1-bromovinyl phosphine oxide in pyridine. For other secondary phosphine oxides a two-step procedure involving corresponding 1-chlorovinyl phosphine oxides is more advantageous. In the syntheses leading to the optically active 1,2-diphosphinylethenes possessing either equivalent or nonequivalent chiral phosphorus centres the novel homochiral (-)-(1-bromovinyl) methylphenylphosphine oxide and (-)-(1-chlorovinyl) methylphenylphosphine oxide have been utilized to afford the very practical self-resolving systems in which one chiral phosphorus centre resolves another. The developed methodology has also been applied to the synthesis of the analogous doubly activated ethenes containing one phosphorus and one sulphur activating group." @default.
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- W243733273 date "1989-01-01" @default.
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- W243733273 title "Optically active phosphine oxides. 8" @default.
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- W243733273 doi "https://doi.org/10.1016/0040-4020(89)80061-4" @default.
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