The first example of a stable phenylsulfaneselenolate species was synthesized in a one-step process and isolated as the tetraphenylphosphonium salt [PPh 4 ][PhSSe] as indicated by X-ray crystal structure analysis. Electrospray ionization mass spectrometry and NMR studies in solution showed the compound to enter a complex system of equilibria when dissolved. Computations suggested a high barrier for rotation around the C–S bond, indicating a π-system conjugated over the whole molecule. In general, the compound is closely related to the recently isolated [PPh 4 ][PhS 2 ] perthiolate salt.
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Jungen et al. (2020) studied this question.
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