The gas-phase reaction of the phosphaalkyne P identical to CtBu with tetraborane(10), B4H10, yields the nido five-vertex phosphacarbaborane cluster compound 2-tBu-1,2-PCB3H5 2 with an unusual 31P NMR peak shift of -500.5 ppm.

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Synthesis and Structural Characterization of the Anion Nido-[B 8 H 11 ] − , and New Insights into the Structures of Other Octaborane Species -[25 refs.]. -(CONDICK, P. N.; FOX, M. A.; GREATREX, R.; ORMSBY, D. L.; Spec. Publ. -R. Soc. Chem. 253 (2000) 179-186; Sch. Chem., Univ. Leeds, Leeds LS2 9JT, UK; EN)