Synthesis of the first 1H-diphosphirene 3 proved straightforward via treatment of the functionalized aminophosphane 1 with the phosphaalkyne 2. X-ray structural analysis of the orange crystals (m.p. −10°C) of 3 clearly suggests the presence of a four-electron, three-center bond.
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Niecke et al. (1989) studied this question.
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