Synthesis and Structural Characterization of C₇₀H₃₈

Feeling the pressure: Hydrogenation of C70 at 100 bar H2 pressure and 400 °C for 72 h has enabled isolation of C70H38. Full structural assignment was achieved by 2D NMR spectroscopic studies, which show C70H38 to have C2 symmetry and contain five benzenoid rings and two protonated carbon atoms on the equator (see picture). The proposed protonation scheme for the formation of this isomer shows a high similarity to reported C70F38isomers.