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The 2-phospha-1,3-butadiene derivatives  3  are readily accessible by reduction of  2  with Mg. Sequential one-electron oxidation of  3  with GaCl 3  leads to the formation of radical cations  4  and dications  5  as crystalline solids.

Isolation of singlet carbene derived 2-phospha-1,3-butadienes and their sequential one-electron oxidation to radical cations and dications