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The development of selective functionalization strategies of white phosphorus (P 4 ) is important to avoid the current chlorinated intermediates. The use of transition metals (TMs) could lead to catalytic procedures, but these are severely hampered by the high reactivity and unpredictable nature of the tetrahedron. Herein, we report selective first steps by reacting P 4  with a metal anion [Cp*Fe(CO) 2 ] −  (Cp*=C 5 (CH 3 ) 5 ), which, in the presence of bulky Lewis acids (LA; B(C 6 F 5 ) 3  or BPh 3 ), leads to unique TM‐substituted LA‐stabilized bicyclo[1.1.0]tetraphosphabutanide anions [Cp*Fe(CO) 2 (η 1 ‐P 4 ⋅LA)] − . Their P‐nucleophilic site can be subsequently protonated to afford the transient LA‐free neutral butterflies  exo , endo ‐ and  exo , exo ‐Cp*Fe‐ (CO) 2 (η 1 ‐P 4 H), allowing controllable stepwise metalate‐mediated functionalization of P 4 .

Metalate‐Mediated Functionalization of P 4 by Trapping Anionic [Cp*Fe(CO) 2 (η 1 ‐P 4 )] − with Lewis Acids