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Reaction of low coordinated 2,2-diphenyl-1-(2,4,6-tri-t-butylphenyl)phosphaethene with elemental sulfur afforded the corresponding 1,2-thiaphosphirane 2-sulfide 6 via methylene(thioxo)phosphorane 5. Desulfurization reaction of 6 gave the corresponding thiaphosphirane 7 and the structure was analyzed by X-ray crystallography. Valence isomerism between 5 and 7 by heat or light was studied.
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Toyota et al. (1994) studied this question.
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