The reaction between Na 2 [nido-6,9-C 2 B 8 H 1 0 ] (glyme, RT, 24 h) and PCl 3 produced the neutral phoshadicarbaborane nido-7,8,11-PC 2 B 8 H 1 1 (35%), which can be quantitatively deprotonated by proton sponge to give the corresponding [7,8,11-nido-PC 2 B 8 H 1 0 ] - anion. A similar reaction using PhPCl 2 as the phosphorus source yielded the isomeric compound 7-Ph-7,8,10-nido-PC 2 B 8 H 1 0 (64%), as well as nido-7,8,11-PC 2 B 8 H 1 1 (14%) resulting from an accompanying dephenylation process.