Four-faced Janus, the god of transitions, now permits interconversion of two mirror images of a P-phenyl-phosphabarbaralane via two orthogonal mechanisms at the same asymmetric center; a Walden-type inversion of a phosphonium salt and a Cope rearrangement of its caged cyclic hydrocarbon skeleton. More information can be found in the Full Paper by K. Nikitin and D. G. Gilheany et al. on doi.org/10.1002/chem.201604080" rel="references:https://doi.org/10.1002/chem.201604080">page 2332 ff.