The strained carbon ring, bicyclo[1.1.1]pentane, was synthesized by a reaction between
1-(phenylsulfanyl)bicyclo[1.1.1]pentane, prepared from propellane, and Raney nickel.
Infrared spectra were recorded at a resolution of 0.0015 cm-1, a resolution significantly
better than previous measurements, 0.06 cm-1. A single fundamental band was analyzed
to determine the ground state and excited...