The synthesis and structure of the symmetrical isomer of C5H–

Abstract

The ion (C₂CHC₂)^– is formed in the gas phase by the process ^–CC–CH(OCOR)–CCD→(C₂CHC₂)^– + (‘RDCO₂’) [R = H, Me or Et]; the ground state structure is a singlet, with C_2v symmetry.