Phenylisothiocyanate reacts with ethyltriphenylphosphanylideneacetate at room temperature to yield 2-(ethoxycar-bonyl)-2-(triphenyl-Λ5-phosphanylidene)-N’-phenylethane thioimidic acid and diethyl-2-(triphenyl-Λ5-phosphanylidene)-3-(phenylimino)pentanedioate. The formation of phosphoranes are explained according to mechanism of the Wittig type reaction. The X-ray analysis structures of phosphorane adducts were studied.
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